4db6e09f |
1 | ################################################## |
2 | # # |
3 | # Assemble with gas # |
4 | # --register-prefix-optional --bitwise-or # |
5 | # # |
6 | ################################################## |
7 | |
8 | .text |
9 | .globl main |
d4279640 |
10 | .globl INT |
1286a1ba |
11 | .globl VBL |
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12 | |
13 | ################################################## |
14 | # # |
15 | # Register and bitmask definitions # |
16 | # # |
17 | ################################################## |
18 | |
19 | .equ GFXDATA, 0xc00000 |
20 | .equ GFXCNTL, 0xc00004 |
21 | |
22 | .equ VDP0_E_HBI, 0x10 |
23 | .equ VDP0_E_DISPLAY, 0x02 |
24 | .equ VDP0_PLTT_FULL, 0x04 |
25 | |
26 | .equ VDP1_SMS_MODE, 0x80 |
27 | .equ VDP1_E_DISPLAY, 0x40 |
28 | .equ VDP1_E_VBI, 0x20 |
29 | .equ VDP1_E_DMA, 0x10 |
30 | .equ VDP1_NTSC, 0x00 |
31 | .equ VDP1_PAL, 0x08 |
32 | .equ VDP1_RESERVED, 0x04 |
33 | |
fbad1b76 |
34 | .equ VDP12_STE, 0x08 |
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35 | .equ VDP12_SCREEN_V224, 0x00 |
36 | .equ VDP12_SCREEN_V448, 0x04 |
37 | .equ VDP12_PROGRESSIVE, 0x00 |
38 | .equ VDP12_INTERLACED, 0x02 |
39 | .equ VDP12_SCREEN_H256, 0x00 |
40 | .equ VDP12_SCREEN_H320, 0x81 |
41 | |
42 | .equ VDP16_MAP_V32, 0x00 |
43 | .equ VDP16_MAP_V64, 0x10 |
44 | .equ VDP16_MAP_V128, 0x30 |
45 | .equ VDP16_MAP_H32, 0x00 |
46 | .equ VDP16_MAP_H64, 0x01 |
47 | .equ VDP16_MAP_H128, 0x03 |
48 | |
4dfddc2f |
49 | .equ MMODE_MAIN, 0 |
50 | .equ MMODE_VAL_INPUT, 1 |
51 | .equ MMODE_EDIT_VAL, 2 |
52 | .equ MMODE_GOTO, 3 |
27d5cc88 |
53 | .equ MMODE_START_MENU, 4 |
54 | .equ MMODE_GOTO_PREDEF, 5 |
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55 | |
27d5cc88 |
56 | .equ predef_addr_cnt, ((predef_addrs_end-predef_addrs)/4) |
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57 | |
58 | ################################################## |
59 | # # |
60 | # MACROS # |
61 | # # |
62 | ################################################## |
63 | |
64 | |
27d5cc88 |
65 | # Write val to VDP register reg |
66 | .macro write_vdp_r_dst reg val dst |
67 | move.w #((\reg << 8) + 0x8000 + \val),\dst |
4db6e09f |
68 | .endm |
69 | |
27d5cc88 |
70 | # Write val to VDP register reg, vdp addr in a3 |
71 | .macro write_vdp_reg reg val |
72 | write_vdp_r_dst \reg, \val, (a3) |
73 | .endm |
4db6e09f |
74 | |
75 | /* For immediate addresses */ |
76 | .macro VRAM_ADDR reg adr |
77 | move.l #(((0x4000 + (\adr & 0x3fff)) << 16) + (\adr >> 14)),\reg |
78 | .endm |
79 | |
0fc4f06b |
80 | .macro CRAM_ADDR reg adr |
81 | move.l #(((0xc000 + (\adr & 0x3fff)) << 16) + (\adr >> 14)),\reg |
82 | .endm |
83 | |
84 | |
85 | # make VDP word from address adr and store in d0 |
86 | .macro XRAM_ADDR_var adr |
570c4371 |
87 | move.l \adr,d0 |
0fc4f06b |
88 | lsl.l #8,d0 |
89 | lsl.l #8,d0 |
90 | rol.l #2,d0 |
91 | lsl.b #2,d0 |
92 | lsr.l #2,d0 |
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93 | .endm |
94 | |
95 | |
0fc4f06b |
96 | .macro VRAM_ADDR_var adr |
97 | XRAM_ADDR_var \adr |
98 | or.l #0x40000000,d0 |
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99 | .endm |
100 | |
101 | |
0fc4f06b |
102 | .macro CRAM_ADDR_var adr |
103 | XRAM_ADDR_var \adr |
104 | or.l #0xc0000000,d0 |
4db6e09f |
105 | .endm |
106 | |
107 | |
108 | .macro VSCROLL_ADDR reg adr |
109 | move.l #(((0x4000 + (\adr & 0x3fff)) << 16) + ((\adr >> 14) | 0x10)),\reg |
110 | .endm |
111 | |
112 | |
113 | .macro HSCROLL_ADDR reg adr |
114 | move.l #(((0x4000 + (\adr & 0x3fff)) << 16) + (\adr >> 14)),\reg |
115 | .endm |
116 | |
117 | |
1286a1ba |
118 | # convert tile coords in d0, d1 to nametable addr to a0 |
119 | .macro XY2NT |
120 | lsl.w #6,d1 |
121 | add.w d1,d0 |
122 | lsl.w #1,d0 |
123 | movea.l #0xe000,a0 |
124 | add.w d0,a0 |
125 | .endm |
126 | |
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127 | # check if some d-pad button (and modifier) is pressed |
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128 | .macro do_dpad bit op val |
129 | btst.l #\bit,d0 |
130 | beq 0f |
131 | \op.l \val,a6 |
132 | bra dpad_end |
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133 | 0: |
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134 | .endm |
135 | |
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136 | # convert a6 to normal addr |
137 | # destroys d0 |
138 | .macro mk_a6_addr reg |
139 | move.l a6,\reg |
140 | moveq.l #0,d0 |
141 | move.b \reg,d0 |
142 | lsr.l #8,\reg |
143 | add.l d0,\reg |
144 | .endm |
145 | |
146 | .macro change_mode mode_new mode_back |
147 | and.w #0xc0ff,d7 |
148 | or.w #(\mode_back<<11)|(\mode_new<<8),d7 |
149 | .endm |
150 | |
27d5cc88 |
151 | .macro menu_text str x y pal |
152 | lea \str,a0 |
153 | move.l #\x,d0 |
154 | move.l #\y,d1 |
155 | move.l #0x8000|(\pal<<13),d2 |
156 | jsr print |
157 | .endm |
158 | |
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159 | ################################################# |
160 | # # |
161 | # DATA # |
162 | # # |
163 | ################################################# |
164 | |
165 | colors: |
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166 | dc.w 0x0000,0x0eee,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000 |
167 | dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000 |
168 | dc.w 0x0000,0x02e2,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000 |
169 | dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000 |
170 | dc.w 0x0000,0x0e44,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000 |
171 | dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000 |
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172 | dc.w 0x0000,0x044e,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000 |
173 | dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000 |
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174 | colors_end: |
175 | |
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176 | |
177 | sprite_data: |
178 | /* Y size link attr X */ |
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179 | dc.w 0; dc.b 0x05; dc.b 0; dc.w 0x6002; dc.w 0 |
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180 | sprite_data_end: |
181 | |
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182 | predef_addrs: |
183 | dc.l 0x000000, 0x200000, 0x400000, 0xa00000, 0xa10000 |
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184 | dc.l 0xa11100, 0xa12000, 0xa13000, 0xa14000, 0xc00000 |
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185 | predef_addrs_end: |
186 | |
187 | safe_addrs: |
188 | dc.l 0x000000, 0x7fffff |
189 | dc.l 0xe00000, 0xffffff |
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190 | dc.l 0xa00000, 0xa100ff |
191 | dc.l 0xa11000, 0xa113ff |
192 | dc.l 0xa12000, 0xa120ff |
193 | dc.l 0xa13000, 0xa130ff |
27d5cc88 |
194 | safe_addrs_end: |
195 | |
4dfddc2f |
196 | txt_edit: |
197 | .ascii "- edit -\0" |
198 | txt_a_confirm: |
199 | .ascii "A-confirm\0" |
27d5cc88 |
200 | txt_about: |
201 | .ascii "hexed r1\0" |
202 | txt_goto: |
203 | .ascii "Go to address\0" |
204 | txt_goto_predef: |
205 | .ascii "Go to (predef)\0" |
206 | txt_dtack: |
207 | .ascii "DTACK safety\0" |
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208 | txt_dtack_err: |
209 | .ascii "DTACK err?\0" |
210 | txt_exc: |
211 | .ascii "Exception \0" |
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212 | |
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213 | ################################################## |
214 | # # |
215 | # MAIN PROGRAM # |
216 | # # |
217 | ################################################## |
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218 | |
219 | # global regs: |
220 | # a6 = page_start[31:8]|cursor_offs[7:0] |
221 | # d7 = old_inputs[31:16]|edit_bytes[15:14]|g_mode_old[13:11]|g_mode[10:8]|irq_cnt[7:0] |
222 | # d6 = edit_word_save[31:15]|edit_done[7]|no_dtack_detect[4]|autorep_cnt[3:0] |
223 | # d5 = main: tmp |
224 | # edit: edit_word[31:8]|edit_pos[4:2]|byte_cnt[1:0] |
225 | # menu: sel |
226 | |
570c4371 |
227 | .align 2 |
228 | |
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229 | main: |
4276cd7a |
230 | /* mask irqs during init */ |
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231 | move.w #0x2700,sr |
232 | |
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233 | .if 0 |
234 | /* copy */ |
235 | lea (0,pc),a0 |
236 | move.l a0,d0 |
237 | swap d0 |
238 | lsr.l #4,d0 |
239 | and.b #0x0f,d0 |
240 | cmp.b #0,d0 |
241 | bne 0f |
242 | |
243 | move.w #8000/2,d0 |
244 | move.l #0,a0 |
245 | move.l #0x400000,a1 |
246 | 1: |
247 | move.w (a0)+,(a1)+ |
248 | dbra d0,1b |
249 | 0: |
250 | .endif |
251 | |
1286a1ba |
252 | movea.l #0,a6 |
4dfddc2f |
253 | move.l #0x8000,d7 |
fbad1b76 |
254 | moveq.l #0,d6 |
1286a1ba |
255 | |
256 | /* Init pads */ |
257 | move.b #0x40,(0xa10009).l |
258 | move.b #0x40,(0xa10003).l |
259 | |
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260 | /* Initialize VDP */ |
261 | jsr init_gfx |
262 | |
263 | /* Load color data */ |
0fc4f06b |
264 | movea.l #0,a0 |
265 | movea.l #colors,a1 |
266 | moveq.l #(colors_end-colors)/2,d0 |
4db6e09f |
267 | jsr load_colors |
268 | |
269 | /* load patterns */ |
0fc4f06b |
270 | movea.l #0,a0 |
271 | movea.l #font,a1 |
272 | move.l #128,d0 |
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273 | jsr load_tiles |
274 | |
275 | /* generate A layer map */ |
1286a1ba |
276 | movea.l #0xe000,a1 |
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277 | move.l #28-1,d4 |
278 | lmaploop0: |
1286a1ba |
279 | movea.l a1,a0 |
4db6e09f |
280 | jsr load_prepare |
281 | |
570c4371 |
282 | move.l #64/2-1,d3 |
0fc4f06b |
283 | 0: move.l #0x00000000,(a0) |
4db6e09f |
284 | dbra d3,0b |
285 | |
1286a1ba |
286 | add.l #64*2,a1 |
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287 | dbra d4,lmaploop0 |
288 | |
289 | /* generate B layer map */ |
0fc4f06b |
290 | movea.l #0xc000,a0 |
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291 | jsr load_prepare |
292 | |
570c4371 |
293 | move.l #64*28/2-1,d3 |
0fc4f06b |
294 | 0: move.l #0x00000000,(a0) |
4db6e09f |
295 | dbra d3,0b |
296 | |
297 | /* upload sprite data */ |
0fc4f06b |
298 | movea.l #0xfc00,a0 |
4db6e09f |
299 | jsr load_prepare |
0fc4f06b |
300 | movea.l #sprite_data,a1 |
4db6e09f |
301 | |
302 | move.l #(sprite_data_end-sprite_data)/2-1,d3 |
0fc4f06b |
303 | 0: move.l (a1)+,(a0) |
4db6e09f |
304 | dbra d3,0b |
305 | |
d4279640 |
306 | /* wait for vsync before unmask */ |
307 | move.l #GFXCNTL,a3 |
308 | 0: |
309 | move.w (a3),d0 |
310 | and.b #8,d0 |
311 | nop |
312 | nop |
313 | beq 0b |
314 | |
1286a1ba |
315 | move.w #0x2000,sr |
570c4371 |
316 | |
4db6e09f |
317 | ################################################## |
1286a1ba |
318 | |
4db6e09f |
319 | forever: |
4db6e09f |
320 | jsr wait_vsync |
321 | bra forever |
4db6e09f |
322 | |
323 | |
d4279640 |
324 | INT: |
325 | /* let's hope VRAM is already set up.. */ |
326 | lea txt_exc,a0 |
327 | move.l #9,d0 |
328 | move.l #27,d1 |
329 | move.l #0xe000,d2 |
330 | jsr print |
331 | bra forever |
332 | |
333 | ################################################## |
334 | |
1286a1ba |
335 | VBL: |
fbad1b76 |
336 | addq.b #1,d7 |
5f6473d9 |
337 | movem.l d0-d4/a0-a5,-(a7) |
1286a1ba |
338 | |
fbad1b76 |
339 | moveq.l #0,d0 |
340 | move.w d7,d0 |
341 | lsr.w #6,d0 |
342 | and.w #0x1c,d0 |
343 | move.l (jumptab,pc,d0),a0 |
344 | jmp (a0) |
345 | jumptab: |
346 | dc.l mode_main |
4dfddc2f |
347 | dc.l mode_val_input |
348 | dc.l mode_edit_val /* edit val in editor */ |
349 | dc.l mode_goto |
27d5cc88 |
350 | dc.l mode_start_menu |
351 | dc.l mode_goto_predef |
fbad1b76 |
352 | dc.l mode_main |
353 | dc.l mode_main |
354 | |
355 | ##################### main ####################### |
356 | |
357 | mode_main: |
d4279640 |
358 | /* assume we will hang */ |
359 | lea txt_dtack_err,a0 |
360 | move.l #9,d0 |
361 | move.l #27,d1 |
362 | move.l #0xe000,d2 |
363 | jsr print |
364 | |
365 | moveq.l #0,d1 |
1286a1ba |
366 | move.l a6,d0 |
4276cd7a |
367 | move.b d0,d1 |
1286a1ba |
368 | lsr.l #8,d0 |
369 | move.l d0,a1 /* current addr */ |
4276cd7a |
370 | lsr.b #3,d1 |
371 | neg.b d1 |
372 | add.b #27-1,d1 /* line where the cursor sits */ |
373 | swap d1 |
1286a1ba |
374 | |
27d5cc88 |
375 | movea.l #0xe002,a2 |
4276cd7a |
376 | move.l #27-1,d5 /* line counter for dbra */ |
377 | or.l d1,d5 |
1286a1ba |
378 | |
27d5cc88 |
379 | draw_row: |
1286a1ba |
380 | move.l a2,a0 |
381 | jsr load_prepare |
382 | |
27d5cc88 |
383 | btst.l #15,d7 |
384 | beq 0f |
385 | move.w #' ',(a0) |
386 | 0: |
1286a1ba |
387 | /* addr */ |
388 | move.l a1,d2 |
389 | moveq.l #6,d3 |
390 | jsr print_hex_preped |
391 | |
27d5cc88 |
392 | btst.l #4,d6 |
393 | bne draw_row_safe |
394 | |
d4279640 |
395 | bsr get_safety_mask |
396 | cmp.b #0xf,d0 |
397 | beq draw_row_safe |
27d5cc88 |
398 | |
d4279640 |
399 | # unsafe or partially safe |
400 | draw_row_hsafe: |
401 | move.l d0,d4 |
402 | swap d4 /* mask in upper word */ |
27d5cc88 |
403 | btst.l #15,d7 |
d4279640 |
404 | bne draw_row_hsafe_words_pre |
27d5cc88 |
405 | |
d4279640 |
406 | draw_row_hsafe_bytes_pre: |
27d5cc88 |
407 | /* 8 bytes */ |
d4279640 |
408 | moveq.l #2,d3 |
409 | move.w #3,d4 |
410 | |
411 | draw_row_hsafe_bytes: |
27d5cc88 |
412 | move.w #' ',(a0) |
d4279640 |
413 | move.b d4,d0 |
414 | add.b #16,d0 |
415 | btst.l d0,d4 |
416 | bne 0f |
27d5cc88 |
417 | move.l #'?'|('?'<<16),(a0) |
d4279640 |
418 | move.w #' ',(a0) |
419 | move.l #'?'|('?'<<16),(a0) |
420 | bra 1f |
421 | 0: |
422 | move.b (0,a1),d2 |
423 | jsr print_hex_preped |
424 | move.w #' ',(a0) |
425 | move.b (1,a1),d2 |
426 | jsr print_hex_preped |
427 | 1: |
428 | addq.l #2,a1 |
429 | dbra d4,draw_row_hsafe_bytes |
27d5cc88 |
430 | |
431 | move.w #' ',(a0) |
432 | |
433 | move.l d5,d0 |
434 | swap d0 |
435 | cmp.w d5,d0 |
436 | beq draw_cursor_unsafe_byte |
d4279640 |
437 | bra draw_chars_hsafe_pre |
27d5cc88 |
438 | |
d4279640 |
439 | draw_row_hsafe_words_pre: |
27d5cc88 |
440 | /* 4 shorts */ |
d4279640 |
441 | moveq.l #4,d3 |
442 | move.w #3,d4 |
443 | |
444 | draw_row_hsafe_words: |
27d5cc88 |
445 | move.w #' ',(a0) |
d4279640 |
446 | move.b d4,d0 |
447 | add.b #16,d0 |
448 | btst.l d0,d4 |
449 | bne 0f |
27d5cc88 |
450 | move.l #'?'|('?'<<16),(a0) |
451 | move.l #'?'|('?'<<16),(a0) |
d4279640 |
452 | bra 1f |
453 | 0: |
454 | move.w (a1),d2 |
455 | jsr print_hex_preped |
456 | 1: |
457 | addq.l #2,a1 |
458 | dbra d4,draw_row_hsafe_words |
27d5cc88 |
459 | |
460 | move.l #(' '<<16)|' ',(a0) |
461 | |
462 | move.l d5,d0 |
463 | swap d0 |
464 | cmp.w d5,d0 |
465 | beq draw_cursor_unsafe_word |
466 | |
d4279640 |
467 | draw_chars_hsafe_pre: |
468 | subq.l #8,a1 |
469 | move.w #3,d4 |
470 | moveq.l #0,d0 |
471 | |
472 | draw_chars_hsafe: |
473 | move.b d4,d0 |
474 | add.b #16,d0 |
475 | btst.l d0,d4 |
476 | bne 0f |
27d5cc88 |
477 | move.l #'?'|('?'<<16),(a0) |
d4279640 |
478 | bra draw_chars_hsafe_next |
479 | 0: |
480 | btst.l #15,d7 /* must perform correct read type */ |
481 | bne 0f /* doing byte reads on security reg hangs */ |
482 | move.b (0,a1),d0 |
483 | lsl.l #8,d0 |
484 | move.b (1,a1),d0 |
485 | bra 1f |
486 | 0: |
487 | move.w (a1),d0 |
488 | 1: |
489 | ror.l #8,d0 |
490 | move.b d0,d1 |
491 | sub.b #0x20,d1 |
492 | cmp.b #0x60,d1 |
493 | blo 0f |
494 | move.b #'.',d0 |
495 | 0: |
496 | move.w d0,(a0) |
497 | |
498 | move.b #0,d0 |
499 | rol.l #8,d0 |
500 | move.b d0,d1 |
501 | sub.b #0x20,d1 |
502 | cmp.b #0x60,d1 |
503 | blo 0f |
504 | move.b #'.',d0 |
505 | 0: |
506 | move.w d0,(a0) |
507 | |
508 | draw_chars_hsafe_next: |
509 | addq.l #2,a1 |
510 | dbra d4,draw_chars_hsafe |
27d5cc88 |
511 | |
512 | move.l #(' '<<16)|' ',(a0) |
27d5cc88 |
513 | add.w #0x80,a2 |
514 | dbra d5,draw_row |
515 | bra draw_status_bar |
516 | |
517 | |
518 | # normal draw |
519 | draw_row_safe: |
520 | btst.l #15,d7 |
521 | bne draw_row_words |
522 | |
523 | draw_row_bytes: |
524 | /* 8 bytes */ |
525 | moveq.l #2,d3 |
526 | moveq.l #8-1,d4 |
527 | draw_bytes: |
528 | move.w #' ',(a0) |
529 | move.b (a1)+,d2 |
530 | jsr print_hex_preped |
531 | dbra d4,draw_bytes |
532 | |
533 | move.w #' ',(a0) |
534 | |
535 | move.l d5,d0 |
536 | swap d0 |
537 | cmp.w d5,d0 |
538 | beq draw_cursor_byte |
539 | bra draw_chars_pre |
540 | |
541 | draw_row_words: |
1286a1ba |
542 | /* 4 shorts */ |
4276cd7a |
543 | moveq.l #4,d3 |
1286a1ba |
544 | moveq.l #4-1,d4 |
27d5cc88 |
545 | draw_words: |
1286a1ba |
546 | move.w #' ',(a0) |
547 | move.w (a1)+,d2 |
1286a1ba |
548 | jsr print_hex_preped |
27d5cc88 |
549 | dbra d4,draw_words |
550 | |
551 | move.l #(' '<<16)|' ',(a0) |
1286a1ba |
552 | |
4276cd7a |
553 | move.l d5,d0 |
554 | swap d0 |
555 | cmp.w d5,d0 |
27d5cc88 |
556 | beq draw_cursor_word |
4276cd7a |
557 | |
558 | draw_chars_pre: |
1286a1ba |
559 | /* 8 chars */ |
560 | subq.l #8,a1 |
561 | moveq.l #8-1,d4 |
562 | draw_chars: |
563 | move.b (a1)+,d0 |
564 | move.b d0,d1 |
565 | sub.b #0x20,d1 |
566 | cmp.b #0x60,d1 |
567 | blo 0f |
568 | move.w #'.',d0 |
569 | 0: |
570 | move.w d0,(a0) |
571 | dbra d4,draw_chars |
572 | |
27d5cc88 |
573 | move.l #(' '<<16)|' ',(a0) |
574 | |
1286a1ba |
575 | add.w #0x80,a2 |
27d5cc88 |
576 | dbra d5,draw_row |
1286a1ba |
577 | |
d4279640 |
578 | |
27d5cc88 |
579 | draw_status_bar: |
4276cd7a |
580 | /* status bar */ |
27d5cc88 |
581 | move.l a2,a0 |
4276cd7a |
582 | jsr load_prepare |
27d5cc88 |
583 | |
584 | btst.l #15,d7 |
585 | beq 0f |
586 | move.w #' ',(a0) |
587 | 0: |
4dfddc2f |
588 | mk_a6_addr d2 |
4276cd7a |
589 | move.l #0x4006,d3 |
590 | jsr print_hex_preped |
d4279640 |
591 | |
592 | /* clear error */ |
593 | moveq.l #5-1,d0 |
594 | 0: |
595 | move.l #' '|(' '<<16),(a0) |
596 | move.l #' '|(' '<<16),(a0) |
597 | dbra d0,0b |
598 | |
4276cd7a |
599 | |
1286a1ba |
600 | /* handle input */ |
601 | jsr get_input /* x0cbrldu x1sa00du */ |
1286a1ba |
602 | |
fbad1b76 |
603 | btst.l #16+4,d0 /* A - scroll modifier */ |
604 | beq input_noa |
605 | |
606 | do_dpad 16+0, sub, #0x0800 |
607 | do_dpad 16+1, add, #0x0800 |
608 | do_dpad 16+10, sub, #0xd800 |
609 | do_dpad 16+11, add, #0xd800 |
610 | input_noa: |
611 | moveq.l #0,d1 |
4dfddc2f |
612 | move.w d7,d1 |
613 | lsr.w #7,d1 |
614 | lsr.w #7,d1 |
fbad1b76 |
615 | |
616 | do_dpad 0, subq, #0x0008 |
617 | do_dpad 1, addq, #0x0008 |
618 | do_dpad 10, sub, d1 |
619 | do_dpad 11, add, d1 |
620 | |
621 | dpad_end: |
4dfddc2f |
622 | /* update addr */ |
623 | move.l a6,d1 |
624 | cmp.b #0xf0,d1 |
625 | blo 0f |
626 | sub.l #0xd800,a6 |
627 | add.w #0x00d8,a6 |
628 | bra 1f |
629 | 0: |
630 | cmp.b #0xd8,d1 |
631 | blo 1f |
632 | add.l #0xd800,a6 |
633 | sub.w #0x00d8,a6 |
634 | 1: |
635 | |
636 | /* other btns */ |
fbad1b76 |
637 | moveq.l #0,d1 |
638 | btst.l #12,d0 /* B - switch byte/word mode */ |
639 | beq input_nob |
4dfddc2f |
640 | bclr.l #15,d7 |
641 | add.w #0x4000,d7 /* changes between 01 10 */ |
fbad1b76 |
642 | move.l a6,d1 |
643 | and.l #1,d1 |
644 | sub.l d1,a6 /* make even, just in case */ |
645 | |
646 | input_nob: |
647 | btst.l #13,d0 /* C - edit selected byte */ |
648 | beq input_noc |
4dfddc2f |
649 | |
650 | change_mode MMODE_EDIT_VAL, MMODE_MAIN |
27d5cc88 |
651 | write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL) |
fbad1b76 |
652 | |
653 | input_noc: |
27d5cc88 |
654 | btst.l #5,d0 /* Start - menu */ |
4dfddc2f |
655 | beq input_nos |
656 | |
27d5cc88 |
657 | moveq.l #0,d5 |
658 | change_mode MMODE_START_MENU, MMODE_MAIN |
659 | write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL) |
1286a1ba |
660 | |
4dfddc2f |
661 | input_nos: |
fbad1b76 |
662 | vbl_end: |
5f6473d9 |
663 | movem.l (a7)+,d0-d4/a0-a5 |
1286a1ba |
664 | rte |
665 | |
666 | |
27d5cc88 |
667 | draw_cursor_unsafe_byte: |
668 | move.l a6,d0 |
669 | and.l #7,d0 /* byte offs */ |
670 | move.b d0,d1 |
671 | add.b d0,d0 |
672 | add.b d1,d0 /* d0 *= 3 (chars) */ |
673 | add.b d0,d0 |
674 | lea (7*2,a2,d0),a0 |
675 | jsr load_prepare |
676 | move.l #(0x2000|'?'|((0x2000|'?')<<16)),(a0) |
677 | |
678 | move.l a2,a0 |
679 | add.w #31*2,a0 |
680 | jsr load_prepare /* restore a0 */ |
d4279640 |
681 | jmp draw_chars_hsafe_pre |
27d5cc88 |
682 | |
683 | draw_cursor_unsafe_word: |
4276cd7a |
684 | move.l a6,d0 |
685 | and.l #7,d0 /* byte offs */ |
686 | move.l d0,d1 |
687 | lsr.b #1,d1 /* which word */ |
688 | move.b d1,d2 |
689 | lsl.b #2,d2 |
690 | add.b d2,d1 /* num of chars to skip */ |
27d5cc88 |
691 | add.b d1,d1 |
692 | |
693 | lea (8*2,a2,d1),a0 |
694 | jsr load_prepare |
695 | move.l #(0x2000|'?'|((0x2000|'?')<<16)),d0 |
696 | move.l d0,(a0) |
697 | move.l d0,(a0) |
698 | |
699 | move.l a2,a0 |
700 | add.w #29*2,a0 |
701 | jsr load_prepare /* restore a0 */ |
d4279640 |
702 | jmp draw_chars_hsafe_pre |
4276cd7a |
703 | |
4276cd7a |
704 | |
fbad1b76 |
705 | draw_cursor_byte: |
27d5cc88 |
706 | move.l a6,d0 |
707 | and.l #7,d0 /* byte offs */ |
708 | move.w #0x2002,d3 |
709 | |
fbad1b76 |
710 | move.b (-8,a1,d0),d2 |
27d5cc88 |
711 | move.b d0,d1 |
712 | add.b d0,d0 |
713 | add.b d1,d0 /* d0 *= 3 (chars) */ |
714 | add.b d0,d0 |
715 | lea (7*2,a2,d0),a0 |
716 | jsr load_prepare |
717 | jsr print_hex_preped |
718 | |
719 | move.l a2,a0 |
720 | add.w #31*2,a0 |
721 | jsr load_prepare /* restore a0 */ |
722 | |
723 | jmp draw_chars_pre |
fbad1b76 |
724 | |
725 | draw_cursor_word: |
27d5cc88 |
726 | move.l a6,d0 |
727 | and.l #7,d0 /* byte offs */ |
728 | move.l d0,d1 |
729 | lsr.b #1,d1 /* which word */ |
730 | move.b d1,d2 |
731 | lsl.b #2,d2 |
732 | add.b d2,d1 /* num of chars to skip */ |
733 | add.b d1,d1 |
734 | move.w #0x2004,d3 |
735 | |
fbad1b76 |
736 | move.w (-8,a1,d0),d2 |
27d5cc88 |
737 | lea (8*2,a2,d1),a0 |
4276cd7a |
738 | jsr load_prepare |
4276cd7a |
739 | jsr print_hex_preped |
740 | |
741 | move.l a2,a0 |
27d5cc88 |
742 | add.w #29*2,a0 |
4276cd7a |
743 | jsr load_prepare /* restore a0 */ |
744 | |
745 | jmp draw_chars_pre |
746 | |
747 | |
4dfddc2f |
748 | #################### hedit ####################### |
749 | |
750 | mode_edit_val: |
751 | btst.l #7,d6 |
752 | bne mode_hedit_finish |
753 | |
754 | /* read val to edit */ |
5f6473d9 |
755 | moveq.l #0,d5 |
4dfddc2f |
756 | mk_a6_addr d1 |
757 | move.l d1,a0 |
4dfddc2f |
758 | btst.l #15,d7 |
759 | bne 0f |
5f6473d9 |
760 | move.b (a0),d5 |
761 | lsl.l #8,d5 |
762 | or.b #1,d5 |
4dfddc2f |
763 | bra 1f |
764 | 0: |
5f6473d9 |
765 | move.w (a0),d5 |
766 | lsl.l #8,d5 |
767 | or.b #2,d5 |
4dfddc2f |
768 | 1: |
4dfddc2f |
769 | |
4dfddc2f |
770 | change_mode MMODE_VAL_INPUT, MMODE_EDIT_VAL |
771 | jmp vbl_end |
772 | |
773 | mode_hedit_finish: |
774 | /* write the val */ |
775 | mk_a6_addr d1 |
776 | move.l d1,a0 |
5f6473d9 |
777 | lsr.l #8,d5 |
4dfddc2f |
778 | |
779 | btst.l #15,d7 |
780 | bne 0f |
5f6473d9 |
781 | move.b d5,(a0) |
4dfddc2f |
782 | bra 1f |
783 | 0: |
5f6473d9 |
784 | move.w d5,(a0) |
4dfddc2f |
785 | 1: |
786 | |
4dfddc2f |
787 | bra return_to_main |
788 | |
789 | ##################### goto ####################### |
790 | |
791 | mode_goto: |
792 | btst.l #7,d6 |
793 | bne mode_goto_finish |
fbad1b76 |
794 | |
5f6473d9 |
795 | moveq.l #0,d5 |
796 | swap d6 |
797 | move.w d6,d5 |
798 | swap d6 |
799 | swap d5 |
800 | or.b #3,d5 /* 3 bytes */ |
4dfddc2f |
801 | bclr.l #7,d6 |
802 | change_mode MMODE_VAL_INPUT, MMODE_GOTO |
803 | jmp vbl_end |
804 | |
805 | mode_goto_finish: |
5f6473d9 |
806 | lsr.l #8,d5 |
807 | move.l d5,d0 |
4dfddc2f |
808 | move.l d0,d1 |
809 | and.l #7,d1 |
810 | and.b #0xf8,d0 |
811 | lsl.l #8,d0 |
812 | or.l d1,d0 |
813 | move.l d0,a6 |
814 | |
5f6473d9 |
815 | lsr.l #8,d5 |
816 | swap d6 |
817 | move.w d5,d6 |
818 | swap d6 |
819 | |
4dfddc2f |
820 | bra return_to_main |
821 | |
822 | ################### val edit ##################### |
823 | |
824 | mode_val_input: |
825 | /* frame */ |
826 | movea.l #0xe000+14*2+11*64*2,a1 |
827 | moveq.l #6-1,d1 |
828 | 0: |
829 | move.w a1,a0 |
830 | jsr load_prepare |
831 | moveq.l #11-1,d0 |
832 | 1: |
833 | move.w #0,(a0) |
834 | dbra d0,1b |
835 | |
836 | add.w #64*2,a1 |
837 | dbra d1,0b |
838 | |
839 | /* text */ |
840 | lea txt_edit,a0 |
841 | move.l #15,d0 |
842 | move.l #11,d1 |
843 | move.l #0xc000,d2 |
844 | jsr print |
845 | |
846 | lea txt_a_confirm,a0 |
847 | move.l #15,d0 |
848 | move.l #15,d1 |
849 | move.l #0xc000,d2 |
850 | jsr print |
851 | |
852 | /* edit field */ |
853 | moveq.l #0,d0 |
854 | moveq.l #0,d1 |
855 | moveq.l #0,d3 |
5f6473d9 |
856 | move.b d5,d3 |
857 | and.b #3,d3 /* edit field bytes */ |
4dfddc2f |
858 | |
859 | move.b #19,d0 |
860 | sub.b d3,d0 |
861 | move.b #13,d1 |
5f6473d9 |
862 | move.l d5,d2 |
4dfddc2f |
863 | lsr.l #8,d2 |
864 | add.b d3,d3 |
865 | or.w #0x8000,d3 |
866 | jsr print_hex |
867 | |
868 | /* current char */ |
869 | moveq.l #0,d0 |
870 | moveq.l #0,d1 |
871 | |
872 | and.w #6,d3 |
873 | move.b #19,d0 |
874 | move.b d3,d1 |
875 | lsr.b #1,d1 /* length in bytes */ |
876 | sub.b d1,d0 |
5f6473d9 |
877 | move.b d5,d1 |
878 | lsr.b #2,d1 |
4dfddc2f |
879 | and.b #7,d1 /* nibble to edit */ |
880 | add.b d1,d0 |
881 | |
882 | sub.b d1,d3 |
883 | sub.b #1,d3 /* chars to shift out */ |
884 | lsl.b #2,d3 |
885 | add.b #8,d3 |
5f6473d9 |
886 | move.l d5,d2 |
4dfddc2f |
887 | lsr.l d3,d2 |
888 | |
889 | move.b #13,d1 |
890 | move.w #0xa001,d3 |
891 | jsr print_hex |
892 | |
893 | /* handle input */ |
894 | jsr get_input /* x0cbrldu x1sa00du */ |
895 | |
896 | move.w d0,d1 |
897 | and.w #0x0f00,d1 |
898 | beq ai_no_dpad |
5f6473d9 |
899 | move.b d5,d1 |
900 | and.b #3,d1 |
4dfddc2f |
901 | add.b d1,d1 /* nibble count */ |
902 | sub.b #1,d1 /* max n.t.e. val */ |
5f6473d9 |
903 | move.b d5,d2 |
904 | lsr.b #2,d2 |
4dfddc2f |
905 | and.b #7,d2 /* nibble to edit */ |
906 | |
907 | move.b d0,d3 |
908 | and.b #3,d3 |
909 | beq ai_no_ud |
910 | moveq.l #0,d3 |
911 | moveq.l #0,d4 |
912 | move.b #0xf,d3 |
913 | move.b #0x1,d4 |
914 | sub.b d2,d1 |
915 | lsl.b #2,d1 |
916 | add.b #8,d1 |
917 | lsl.l d1,d3 /* mask */ |
918 | lsl.l d1,d4 /* what to add/sub */ |
5f6473d9 |
919 | move.l d5,d1 |
4dfddc2f |
920 | and.l d3,d1 |
921 | btst.l #8,d0 |
922 | beq 0f |
923 | add.l d4,d1 |
924 | bra 1f |
925 | 0: |
926 | sub.l d4,d1 |
927 | 1: |
928 | and.l d3,d1 |
929 | eor.l #0xffffffff,d3 |
5f6473d9 |
930 | and.l d3,d5 |
931 | or.l d1,d5 |
4dfddc2f |
932 | jmp vbl_end |
933 | |
934 | ai_no_ud: |
935 | btst.l #10,d0 |
936 | bne 0f |
937 | add.b #1,d2 |
938 | bra 1f |
939 | 0: |
940 | sub.b #1,d2 |
941 | 1: |
942 | cmp.b #0,d2 |
943 | bge 0f |
944 | move.b d1,d2 |
945 | 0: |
946 | cmp.b d1,d2 |
947 | ble 0f |
948 | move.b #0,d2 |
949 | 0: |
5f6473d9 |
950 | and.b #0xe3,d5 |
951 | lsl.b #2,d2 |
952 | or.b d2,d5 |
4dfddc2f |
953 | jmp vbl_end |
954 | |
955 | ai_no_dpad: |
956 | move.w d0,d1 |
957 | and.w #0x1020,d1 |
958 | beq ai_no_sb |
959 | |
4dfddc2f |
960 | bra return_to_main |
961 | |
962 | ai_no_sb: |
5f6473d9 |
963 | btst.l #4,d0 /* A - confirm */ |
4dfddc2f |
964 | beq ai_no_input |
965 | bset.l #7,d6 |
5f6473d9 |
966 | move.w d7,d1 /* back to prev mode */ |
4dfddc2f |
967 | and.w #0x3800,d1 |
968 | lsr.w #3,d1 |
969 | and.w #0xc0ff,d7 |
970 | or.w d1,d7 |
971 | |
972 | ai_no_input: |
973 | jmp vbl_end |
974 | |
975 | |
27d5cc88 |
976 | ################### start menu ################### |
977 | |
978 | mode_start_menu: |
979 | /* frame */ |
980 | bsr start_menu_box |
981 | |
982 | /* text */ |
983 | menu_text txt_about, 13, 9, 1 |
984 | menu_text txt_goto, 13, 11, 0 |
985 | menu_text txt_goto_predef, 13, 12, 0 |
986 | menu_text txt_dtack, 13, 13, 0 |
987 | menu_text txt_a_confirm, 13, 15, 2 |
988 | |
989 | /* dtack safety on/off */ |
990 | movea.l #0xe000+26*2+13*64*2,a0 |
991 | jsr load_prepare |
992 | move.w #0x8000|'O',(a0) |
993 | btst.l #4,d6 |
994 | bne 0f |
995 | move.w #0x8000|'N',(a0) |
996 | bra 1f |
997 | 0: |
998 | move.w #0x8000|'F',(a0) |
999 | move.w #0x8000|'F',(a0) |
1000 | 1: |
1001 | |
1002 | /* cursor */ |
1003 | movea.l #0xe000+11*2+11*64*2,a0 |
1004 | moveq.l #0,d0 |
1005 | move.b d5,d0 |
1006 | and.b #3,d0 |
1007 | lsl.w #7,d0 |
1008 | add.w d0,a0 |
1009 | jsr load_prepare |
1010 | move.w #'>',(a0) |
1011 | |
1012 | /* input */ |
1013 | jsr get_input /* x0cbrldu x1sa00du */ |
1014 | |
1015 | move.w d0,d1 |
1016 | and.w #3,d1 |
1017 | beq msm_no_ud |
1018 | move.b d5,d1 |
1019 | and.b #3,d1 |
1020 | btst.l #0,d0 |
1021 | sne d2 |
1022 | or.b #1,d2 /* up -1, down 1 */ |
1023 | add.b d2,d1 |
1024 | cmp.b #0,d1 |
1025 | bge 0f |
1026 | move.b #2,d1 |
1027 | 0: |
1028 | cmp.b #2,d1 |
1029 | ble 0f |
1030 | move.b #0,d1 |
1031 | 0: |
1032 | and.b #0xfc,d5 |
1033 | or.b d1,d5 |
1034 | jmp vbl_end |
1035 | |
1036 | msm_no_ud: |
1037 | btst.l #4,d0 /* A - confirm */ |
1038 | beq msm_no_a |
1039 | move.b d5,d1 |
1040 | and.b #3,d1 |
1041 | bne 0f |
1042 | change_mode MMODE_GOTO, MMODE_MAIN |
1043 | bsr start_menu_box |
1044 | jmp vbl_end |
1045 | 0: |
1046 | cmp.b #1,d1 |
1047 | bne 0f |
1048 | moveq.l #0,d5 |
1049 | change_mode MMODE_GOTO_PREDEF, MMODE_MAIN |
1050 | bsr start_menu_box |
1051 | jmp vbl_end |
1052 | 0: |
1053 | cmp.b #2,d1 |
1054 | bne 0f |
1055 | bchg.l #4,d6 |
1056 | jmp vbl_end |
1057 | 0: |
1058 | |
1059 | msm_no_a: |
1060 | move.w d0,d1 |
1061 | and.w #0x3000,d1 |
1062 | beq msm_no_bc |
1063 | bra return_to_main |
1064 | |
1065 | msm_no_bc: |
1066 | jmp vbl_end |
1067 | |
1068 | start_menu_box: |
1069 | movea.l #0xe000+10*2+8*64*2,a1 |
1070 | move.w #9-1,d1 |
1071 | 0: |
1072 | move.w a1,a0 |
1073 | jsr load_prepare |
1074 | move.w #20-1,d0 |
1075 | 1: |
1076 | move.w #0,(a0) |
1077 | dbra d0,1b |
1078 | |
1079 | add.w #64*2,a1 |
1080 | dbra d1,0b |
1081 | rts |
1082 | |
1083 | ################### goto predef ################## |
1084 | |
1085 | mode_goto_predef: |
1086 | /* frame */ |
1087 | movea.l #0xe000+14*2+8*64*2,a1 |
1088 | move.l #predef_addr_cnt+2-1,d1 |
1089 | 0: |
1090 | move.w a1,a0 |
1091 | jsr load_prepare |
1092 | moveq.l #10-1,d0 |
1093 | 1: |
1094 | move.w #0,(a0) |
1095 | dbra d0,1b |
1096 | |
1097 | add.w #64*2,a1 |
1098 | dbra d1,0b |
1099 | |
1100 | /* draw addresses */ |
1101 | movea.l #0xe000+17*2+9*64*2,a1 |
1102 | lea predef_addrs,a2 |
1103 | move.w #predef_addr_cnt-1,d4 |
1104 | move.l #0x8006,d3 |
1105 | mgp_da_loop: |
1106 | move.w a1,a0 |
1107 | jsr load_prepare |
1108 | move.l (a2)+,d2 |
1109 | jsr print_hex_preped |
1110 | add.w #64*2,a1 |
1111 | dbra d4,mgp_da_loop |
1112 | |
1113 | /* cursor */ |
1114 | movea.l #0xe000+15*2+9*64*2,a0 |
1115 | moveq.l #0,d0 |
1116 | move.b d5,d0 |
1117 | lsl.w #7,d0 |
1118 | add.w d0,a0 |
1119 | jsr load_prepare |
1120 | move.w #'>',(a0) |
1121 | |
1122 | /* input */ |
1123 | jsr get_input /* x0cbrldu x1sa00du */ |
1124 | |
1125 | move.w d0,d1 |
1126 | and.w #3,d1 |
1127 | beq mgp_no_ud |
1128 | btst.l #0,d0 |
1129 | sne d2 |
1130 | or.b #1,d2 /* up -1, down 1 */ |
1131 | add.b d2,d5 |
1132 | cmp.b #0,d5 |
1133 | bge 0f |
1134 | move.b #predef_addr_cnt-1,d5 |
1135 | 0: |
1136 | cmp.b #predef_addr_cnt-1,d5 |
1137 | ble 0f |
1138 | move.b #0,d5 |
1139 | 0: |
1140 | jmp vbl_end |
1141 | |
1142 | mgp_no_ud: |
1143 | btst.l #4,d0 /* A - confirm */ |
1144 | beq mgp_no_a |
1145 | moveq.l #0,d0 |
1146 | move.b d5,d0 |
1147 | lsl.w #2,d0 |
1148 | lea predef_addrs,a0 |
1149 | move.l (a0,d0),d5 |
1150 | lsl.l #8,d5 |
1151 | jmp mode_goto_finish |
1152 | |
1153 | mgp_no_a: |
1154 | move.w d0,d1 |
1155 | and.w #0x3000,d1 |
1156 | beq mgp_no_bc |
1157 | bra return_to_main |
1158 | |
1159 | mgp_no_bc: |
1160 | jmp vbl_end |
1161 | |
1162 | |
4dfddc2f |
1163 | # go back to main mode |
1164 | return_to_main: |
5f6473d9 |
1165 | bclr.l #7,d6 /* not edited */ |
4dfddc2f |
1166 | change_mode MMODE_MAIN, MMODE_MAIN |
27d5cc88 |
1167 | write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320),(GFXCNTL) |
fbad1b76 |
1168 | jmp vbl_end |
1169 | |
1170 | |
4db6e09f |
1171 | ################################################# |
1172 | # # |
1173 | # Initialize VDP registers # |
1174 | # # |
1175 | ################################################# |
1176 | |
1177 | init_gfx: |
1178 | move.l #GFXCNTL,a3 |
570c4371 |
1179 | write_vdp_reg 0,(VDP0_E_DISPLAY | VDP0_PLTT_FULL) |
1180 | write_vdp_reg 1,(VDP1_E_VBI | VDP1_E_DISPLAY | VDP1_E_DMA | VDP1_RESERVED) |
4db6e09f |
1181 | write_vdp_reg 2,(0xe000 >> 10) /* Screen map a adress */ |
1182 | write_vdp_reg 3,(0xe000 >> 10) /* Window address */ |
1183 | write_vdp_reg 4,(0xc000 >> 13) /* Screen map b address */ |
1184 | write_vdp_reg 5,(0xfc00 >> 9) /* Sprite address */ |
1185 | write_vdp_reg 6,0 |
570c4371 |
1186 | write_vdp_reg 7,0 /* Backdrop color */ |
4db6e09f |
1187 | write_vdp_reg 10,1 /* Lines per hblank interrupt */ |
1188 | write_vdp_reg 11,0 /* 2-cell vertical scrolling */ |
570c4371 |
1189 | write_vdp_reg 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320) |
1190 | write_vdp_reg 13,(0x8000 >> 10) /* Horizontal scroll address */ |
4db6e09f |
1191 | write_vdp_reg 15,2 |
570c4371 |
1192 | write_vdp_reg 16,(VDP16_MAP_V32 | VDP16_MAP_H64) /* layer size */ |
4db6e09f |
1193 | write_vdp_reg 17,0 |
1194 | write_vdp_reg 18,0xff |
1195 | rts |
1196 | |
1197 | |
d4279640 |
1198 | # get mask of bits representing safe words |
27d5cc88 |
1199 | # a1 - address to check |
1200 | # destroys d0-d2, strips upper bits from a1 |
d4279640 |
1201 | get_safety_mask: |
27d5cc88 |
1202 | move.l a1,d1 |
1203 | lsl.l #8,d1 |
1204 | lsr.l #8,d1 |
1205 | lea safe_addrs,a1 |
1206 | move.w #(safe_addrs_end - safe_addrs)/8-1,d2 |
1207 | 0: |
1208 | move.l (a1)+,d0 |
1209 | cmp.l d0,d1 |
1210 | blt 1f |
1211 | move.l (a1),d0 |
1212 | cmp.l d0,d1 |
1213 | ble addr_safe |
1214 | 1: |
1215 | addq.l #4,a1 |
1216 | dbra d2,0b |
1217 | |
27d5cc88 |
1218 | move.l d1,a1 |
d4279640 |
1219 | |
1220 | moveq.l #0x0c,d0 |
1221 | cmp.l #0xa14000,d1 |
1222 | beq gsm_rts |
1223 | |
1224 | moveq.l #0x08,d0 |
1225 | cmp.l #0xa14100,d1 |
1226 | beq gsm_rts |
1227 | |
1228 | /* check for VDP address */ |
1229 | move.l d1,d0 |
1230 | swap d0 |
1231 | and.b #0xe0,d0 |
1232 | cmp.b #0xc0,d0 |
1233 | bne addr_unsafe /* not vdp */ |
1234 | |
1235 | move.l d1,d0 |
1236 | and.l #0x0700e0,d0 |
1237 | bne addr_unsafe |
1238 | |
1239 | move.l d1,d0 |
1240 | and.b #0x1f,d0 |
1241 | cmp.b #0x04,d0 |
1242 | blt addr_hsafe_3 /* data port */ |
1243 | cmp.b #0x10,d0 |
1244 | blt addr_safe /* below PSG */ |
1245 | cmp.b #0x18,d0 |
1246 | bge addr_safe /* above PSG */ |
1247 | |
1248 | addr_unsafe: |
1249 | moveq.l #0,d0 /* skip line */ |
1250 | rts |
1251 | |
1252 | addr_hsafe_3: |
1253 | moveq.l #3,d0 /* skip 2 words */ |
27d5cc88 |
1254 | rts |
1255 | |
1256 | addr_safe: |
1257 | move.l d1,a1 |
d4279640 |
1258 | moveq.l #0xf,d0 |
1259 | gsm_rts: |
27d5cc88 |
1260 | rts |
1261 | |
1262 | |
1286a1ba |
1263 | # read single phase from controller |
fbad1b76 |
1264 | # #a0 - addr |
1286a1ba |
1265 | # d0 - result |
fbad1b76 |
1266 | # destroys d1,d2 |
1286a1ba |
1267 | get_input: |
1268 | move.b #0x40,(0xa10003) |
1269 | nop |
1270 | nop |
1271 | nop |
1272 | move.b (0xa10003),d0 |
1273 | move.b #0x00,(0xa10003) |
1274 | lsl.w #8,d0 |
1275 | nop |
1276 | move.b (0xa10003),d0 |
1277 | eor.w #0xffff,d0 |
fbad1b76 |
1278 | |
1279 | swap d7 |
1280 | move.w d7,d1 |
1281 | eor.w d0,d1 /* changed btns */ |
1282 | move.w d0,d7 /* old val */ |
1283 | swap d7 |
1284 | and.w d0,d1 /* what changed now */ |
1285 | bne 0f |
1286 | |
1287 | addq.b #1,d6 |
1288 | move.b d6,d2 |
27d5cc88 |
1289 | and.b #0x0f,d2 /* do autorepeat */ |
1290 | cmp.b #9,d2 |
fbad1b76 |
1291 | bne 1f |
1292 | move.w d0,d1 |
1293 | 0: |
27d5cc88 |
1294 | and.b #0xf0,d6 |
fbad1b76 |
1295 | 1: |
1296 | swap d0 |
1297 | move.w d1,d0 |
1286a1ba |
1298 | rts |
1299 | |
0fc4f06b |
1300 | # Load tile data from ROM |
1301 | # a0: VRAM base |
1302 | # a1: pattern address |
1303 | # d0: number of tiles to load |
1304 | # destroys d1 |
4db6e09f |
1305 | |
1306 | load_tiles: |
0fc4f06b |
1307 | move.l d0,d1 |
1308 | VRAM_ADDR_var a0 |
1309 | move.l d0,(GFXCNTL).l |
4db6e09f |
1310 | |
0fc4f06b |
1311 | move.l #GFXDATA,a0 |
1312 | lsl.w #3,d1 |
1313 | subq.l #1,d1 |
1314 | 0: |
1315 | move.l (a1)+,(a0) |
1316 | dbra d1,0b |
4db6e09f |
1317 | |
1318 | rts |
1319 | |
1320 | |
4dfddc2f |
1321 | # Prepare to write to VDP RAM @a0 |
0fc4f06b |
1322 | # sets a0 to VDP data port for convenience |
1323 | # a0: VRAM base |
1324 | # destroys d0 |
570c4371 |
1325 | |
4db6e09f |
1326 | load_prepare: |
0fc4f06b |
1327 | VRAM_ADDR_var a0 |
1328 | move.l d0,(GFXCNTL).l |
1329 | move.l #GFXDATA,a0 |
4db6e09f |
1330 | rts |
1331 | |
1332 | |
0fc4f06b |
1333 | # Load color data from ROM |
1334 | # a0: CRAM base |
1335 | # a1: color list address |
1336 | # d0: number of colors to load |
1337 | # destroys d1 |
4db6e09f |
1338 | |
1339 | load_colors: |
0fc4f06b |
1340 | move.l d0,d1 |
1341 | CRAM_ADDR_var a0 |
1342 | move.l d0,(GFXCNTL).l |
4db6e09f |
1343 | |
0fc4f06b |
1344 | move.l #GFXDATA,a0 |
1345 | subq.w #1,d1 |
1346 | 0: |
1347 | move.w (a1)+,(a0) |
1348 | dbra d1,0b |
4db6e09f |
1349 | |
1350 | rts |
1351 | |
0fc4f06b |
1352 | |
1353 | # print |
1354 | # a0 - string |
1355 | # d0 - x |
1356 | # d1 - y |
4dfddc2f |
1357 | # d2 - tile_bits[15:11] |
0fc4f06b |
1358 | # destroys a1 |
570c4371 |
1359 | |
1360 | print: |
0fc4f06b |
1361 | move.l a0,a1 |
1286a1ba |
1362 | XY2NT |
0fc4f06b |
1363 | jsr load_prepare |
4dfddc2f |
1364 | move.l d2,d0 |
1365 | and.w #0xf800,d0 |
570c4371 |
1366 | |
1367 | _print_loop: |
0fc4f06b |
1368 | move.b (a1)+,d0 |
570c4371 |
1369 | beq _print_end |
1370 | |
0fc4f06b |
1371 | move.w d0,(a0) |
570c4371 |
1372 | jmp _print_loop |
1373 | |
1374 | _print_end: |
1375 | rts |
1376 | |
4db6e09f |
1377 | |
1286a1ba |
1378 | # print_hex |
1379 | # d0 - x |
1380 | # d1 - y |
1381 | # d2 - value |
27d5cc88 |
1382 | # d3 - tile_bits[15:11]|digit_cnt[7:0] |
4276cd7a |
1383 | # destroys a0, preserves d3 |
1286a1ba |
1384 | |
1385 | print_hex: |
1386 | XY2NT |
1387 | jsr load_prepare |
1388 | |
1389 | print_hex_preped: |
4276cd7a |
1390 | moveq.l #0,d0 |
1391 | move.b d3,d0 |
1392 | move.l d0,d1 |
1286a1ba |
1393 | lsl.b #2,d0 |
1394 | ror.l d0,d2 /* prep value */ |
4276cd7a |
1395 | subq.l #1,d1 /* count */ |
1396 | move.w d3,d0 |
1397 | and.w #0xf800,d0 /* keep upper bits in d0 */ |
1286a1ba |
1398 | |
1399 | _print_hex_loop: |
1400 | rol.l #4,d2 |
1401 | move.b d2,d0 |
1402 | and.b #0xf,d0 |
1286a1ba |
1403 | |
1404 | add.b #'0',d0 |
4276cd7a |
1405 | cmp.b #'9',d0 |
1406 | ble 0f |
1407 | addq.b #7,d0 |
1408 | 0: |
1286a1ba |
1409 | move.w d0,(a0) |
4276cd7a |
1410 | dbra d1,_print_hex_loop |
1286a1ba |
1411 | |
1412 | rts |
1413 | |
1414 | |
4db6e09f |
1415 | ################################################# |
1416 | # # |
1417 | # Wait for next VBlank interrupt # |
1418 | # # |
1419 | ################################################# |
1420 | |
1421 | wait_vsync: |
fbad1b76 |
1422 | move.b d7,d0 |
4db6e09f |
1423 | _wait_change: |
1424 | stop #0x2000 |
fbad1b76 |
1425 | cmp.b d7,d0 |
4db6e09f |
1426 | beq _wait_change |
1427 | rts |
1428 | |
1429 | |
1430 | ################################################# |
1431 | # # |
1432 | # RAM DATA # |
1433 | # # |
1434 | ################################################# |
1435 | |
1436 | .bss |
570c4371 |
1437 | |
fbad1b76 |
1438 | # nothing :) |
4db6e09f |
1439 | |
1440 | .end |
1441 | |
1442 | # vim:filetype=asmM68k |