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74d5977b 1###############################################################################
2#
f28eaaad 3# Copyright (c) 2009,2011 GraÅžvydas Ignotas
74d5977b 4# All rights reserved.
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions are met:
8# * Redistributions of source code must retain the above copyright
9# notice, this list of conditions and the following disclaimer.
10# * Redistributions in binary form must reproduce the above copyright
11# notice, this list of conditions and the following disclaimer in the
12# documentation and/or other materials provided with the distribution.
13# * Neither the name of the organization nor the
14# names of its contributors may be used to endorse or promote products
15# derived from this software without specific prior written permission.
16#
f28eaaad 17# THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND ANY
74d5977b 18# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
f28eaaad 20# DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY
74d5977b 21# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27#
28# Assemble with gas
29# --register-prefix-optional --bitwise-or
30#
4db6e09f 31
ff17c043 32.equ USE_VINT, 0
33.equ COPY_TO_EXP, 1
34.equ RELOCATE_TO_RAM, 1
318e20ff 35
4db6e09f 36.text
37.globl main
d4279640 38.globl INT
1286a1ba 39.globl VBL
8689c962 40.globl return_to_main
4db6e09f 41
42##################################################
43# #
44# Register and bitmask definitions #
45# #
46##################################################
47
48.equ GFXDATA, 0xc00000
49.equ GFXCNTL, 0xc00004
50
51.equ VDP0_E_HBI, 0x10
52.equ VDP0_E_DISPLAY, 0x02
53.equ VDP0_PLTT_FULL, 0x04
54
55.equ VDP1_SMS_MODE, 0x80
56.equ VDP1_E_DISPLAY, 0x40
57.equ VDP1_E_VBI, 0x20
58.equ VDP1_E_DMA, 0x10
59.equ VDP1_NTSC, 0x00
60.equ VDP1_PAL, 0x08
d90ff128 61.equ VDP1_MODE5, 0x04
4db6e09f 62
fbad1b76 63.equ VDP12_STE, 0x08
4db6e09f 64.equ VDP12_SCREEN_V224, 0x00
65.equ VDP12_SCREEN_V448, 0x04
66.equ VDP12_PROGRESSIVE, 0x00
67.equ VDP12_INTERLACED, 0x02
68.equ VDP12_SCREEN_H256, 0x00
69.equ VDP12_SCREEN_H320, 0x81
70
71.equ VDP16_MAP_V32, 0x00
72.equ VDP16_MAP_V64, 0x10
73.equ VDP16_MAP_V128, 0x30
74.equ VDP16_MAP_H32, 0x00
75.equ VDP16_MAP_H64, 0x01
76.equ VDP16_MAP_H128, 0x03
77
4dfddc2f 78.equ MMODE_MAIN, 0
79.equ MMODE_VAL_INPUT, 1
80.equ MMODE_EDIT_VAL, 2
81.equ MMODE_GOTO, 3
27d5cc88 82.equ MMODE_START_MENU, 4
83.equ MMODE_GOTO_PREDEF, 5
d90ff128 84.equ MMODE_JMP_ADDR, 6
8689c962 85.equ MMODE_PC, 7
4db6e09f 86
27d5cc88 87.equ predef_addr_cnt, ((predef_addrs_end-predef_addrs)/4)
4db6e09f 88
89##################################################
90# #
91# MACROS #
92# #
93##################################################
94
95
27d5cc88 96# Write val to VDP register reg
97.macro write_vdp_r_dst reg val dst
98 move.w #((\reg << 8) + 0x8000 + \val),\dst
4db6e09f 99.endm
100
27d5cc88 101# Write val to VDP register reg, vdp addr in a3
102.macro write_vdp_reg reg val
103 write_vdp_r_dst \reg, \val, (a3)
104.endm
4db6e09f 105
d90ff128 106# Set up address in VDP, control port in dst
107.macro VRAM_ADDR adr dst
80560599 108 move.l #(0x40000000 | ((\adr & 0x3fff) << 16) | (\adr >> 14)),\dst
109.endm
110
111.macro VSRAM_ADDR adr dst
112 move.l #(0x40000010 | ((\adr & 0x3fff) << 16) | (\adr >> 14)),\dst
0fc4f06b 113.endm
114
115
116# make VDP word from address adr and store in d0
117.macro XRAM_ADDR_var adr
570c4371 118 move.l \adr,d0
0fc4f06b 119 lsl.l #8,d0
120 lsl.l #8,d0
121 rol.l #2,d0
122 lsl.b #2,d0
123 lsr.l #2,d0
4db6e09f 124.endm
125
126
0fc4f06b 127.macro VRAM_ADDR_var adr
128 XRAM_ADDR_var \adr
129 or.l #0x40000000,d0
4db6e09f 130.endm
131
132
0fc4f06b 133.macro CRAM_ADDR_var adr
134 XRAM_ADDR_var \adr
135 or.l #0xc0000000,d0
4db6e09f 136.endm
137
138
1286a1ba 139# convert tile coords in d0, d1 to nametable addr to a0
140.macro XY2NT
141 lsl.w #6,d1
142 add.w d1,d0
143 lsl.w #1,d0
144 movea.l #0xe000,a0
145 add.w d0,a0
146.endm
147
4276cd7a 148# check if some d-pad button (and modifier) is pressed
fbad1b76 149.macro do_dpad bit op val
150 btst.l #\bit,d0
151 beq 0f
152 \op.l \val,a6
153 bra dpad_end
4276cd7a 1540:
4276cd7a 155.endm
156
4dfddc2f 157# convert a6 to normal addr
158# destroys d0
159.macro mk_a6_addr reg
160 move.l a6,\reg
161 moveq.l #0,d0
162 move.b \reg,d0
163 lsr.l #8,\reg
164 add.l d0,\reg
165.endm
166
167.macro change_mode mode_new mode_back
168 and.w #0xc0ff,d7
169 or.w #(\mode_back<<11)|(\mode_new<<8),d7
170.endm
171
80560599 172# destroys a0,d0-d2
27d5cc88 173.macro menu_text str x y pal
318e20ff 174 lea (\str,pc),a0
27d5cc88 175 move.l #\x,d0
176 move.l #\y,d1
177 move.l #0x8000|(\pal<<13),d2
178 jsr print
179.endm
180
4db6e09f 181#################################################
182# #
183# DATA #
184# #
185#################################################
186
187colors:
4276cd7a 188 dc.w 0x0000,0x0eee,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
189 dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
190 dc.w 0x0000,0x02e2,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
191 dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
192 dc.w 0x0000,0x0e44,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
193 dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
d4279640 194 dc.w 0x0000,0x044e,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
195 dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
570c4371 196colors_end:
197
4db6e09f 198
199sprite_data:
200 /* Y size link attr X */
570c4371 201 dc.w 0; dc.b 0x05; dc.b 0; dc.w 0x6002; dc.w 0
4db6e09f 202sprite_data_end:
203
27d5cc88 204predef_addrs:
205 dc.l 0x000000, 0x200000, 0x400000, 0xa00000, 0xa10000
d4279640 206 dc.l 0xa11100, 0xa12000, 0xa13000, 0xa14000, 0xc00000
27d5cc88 207predef_addrs_end:
208
209safe_addrs:
210 dc.l 0x000000, 0x7fffff
211 dc.l 0xe00000, 0xffffff
d4279640 212 dc.l 0xa00000, 0xa100ff
213 dc.l 0xa11000, 0xa113ff
214 dc.l 0xa12000, 0xa120ff
215 dc.l 0xa13000, 0xa130ff
27d5cc88 216safe_addrs_end:
217
4dfddc2f 218txt_edit:
219 .ascii "- edit -\0"
220txt_a_confirm:
221 .ascii "A-confirm\0"
27d5cc88 222txt_about:
318e20ff 223 .ascii "hexed r2\0"
27d5cc88 224txt_goto:
225 .ascii "Go to address\0"
226txt_goto_predef:
227 .ascii "Go to (predef)\0"
d90ff128 228txt_jmp_addr:
229 .ascii "Jump to address\0"
80560599 230txt_dump:
8689c962 231 .ascii "PC Transfer\0"
27d5cc88 232txt_dtack:
233 .ascii "DTACK safety\0"
8689c962 234txt_transfer_ready:
235 .ascii "Transfer Ready\0"
80560599 236txt_working:
8689c962 237 .ascii "PC mode \0"
d4279640 238txt_dtack_err:
239 .ascii "DTACK err?\0"
240txt_exc:
241 .ascii "Exception \0"
4dfddc2f 242
4db6e09f 243##################################################
244# #
245# MAIN PROGRAM #
246# #
247##################################################
27d5cc88 248
249# global regs:
250# a6 = page_start[31:8]|cursor_offs[7:0]
251# d7 = old_inputs[31:16]|edit_bytes[15:14]|g_mode_old[13:11]|g_mode[10:8]|irq_cnt[7:0]
252# d6 = edit_word_save[31:15]|edit_done[7]|no_dtack_detect[4]|autorep_cnt[3:0]
253# d5 = main: tmp
254# edit: edit_word[31:8]|edit_pos[4:2]|byte_cnt[1:0]
255# menu: sel
256
570c4371 257.align 2
258
4db6e09f 259main:
8689c962 260 /* make sure io port 2 is doing inputs */
261 move.b #0,(0xa1000b).l
4276cd7a 262 /* mask irqs during init */
1286a1ba 263 move.w #0x2700,sr
264
ff17c043 265.if COPY_TO_EXP
80560599 266 /* copy to expansion device if magic number is set */
267 move.l #0x400000,a1
268 cmp.w #0x1234,(a1)
27d5cc88 269 bne 0f
270
80560599 271 move.l #0,a0
318e20ff 272 move.w #0x2000/8-1,d0
80560599 2731:
274 move.l (a0)+,(a1)+
275 move.l (a0)+,(a1)+
276 dbra d0,1b
2770:
278.endif
279
280.if RELOCATE_TO_RAM
ff17c043 281 /* we could be relocated by 32x or something else, adjust start addr */
282 lea (pc),a0
283 move.l a0,d0
284 and.l #0xff0000,d0
285 move.l d0,a0
286
80560599 287 /* copy, assume 8K size */
318e20ff 288 move.l #0xFF0100,a1
80560599 289 move.w #0x2000/8-1,d0
27d5cc88 2901:
318e20ff 291 move.l (a0)+,(a1)+
292 move.l (a0)+,(a1)+
27d5cc88 293 dbra d0,1b
80560599 294
ff17c043 295 /* copy test code */
296 lea (test_code,pc),a0
297 move.l #0xffc000,a1
298 move.w #(test_code_end - test_code)/2-1,d0
2991:
300 move.w (a0)+,(a1)+
301 dbra d0,1b
302
318e20ff 303 lea (0f,pc),a0
ff17c043 304 move.l a0,d0
305 and.l #0x00ffff,d0
306 add.l #0xFF0100,d0
307 move.l d0,a0
308
309 /* patch test code */
310 move.l #0xffc000,a1
311 add.w #(test_code_ret_op-test_code+2),a1
312 move.l a0,(a1)
313
318e20ff 314 jmp (a0)
27d5cc88 3150:
316.endif
317
1286a1ba 318 movea.l #0,a6
4dfddc2f 319 move.l #0x8000,d7
fbad1b76 320 moveq.l #0,d6
1286a1ba 321
322 /* Init pads */
323 move.b #0x40,(0xa10009).l
324 move.b #0x40,(0xa10003).l
325
4db6e09f 326 /* Initialize VDP */
327 jsr init_gfx
328
80560599 329 /* Clear h/v scroll */
330 movea.l #GFXDATA,a0
331 VRAM_ADDR 0x8000,(GFXCNTL)
332 move.l #0,(a0)
333 VSRAM_ADDR 0,(GFXCNTL)
334 move.l #0,(a0)
335
4db6e09f 336 /* Load color data */
0fc4f06b 337 movea.l #0,a0
318e20ff 338 lea (colors,pc),a1
0fc4f06b 339 moveq.l #(colors_end-colors)/2,d0
4db6e09f 340 jsr load_colors
341
d90ff128 342 /* load font patterns */
318e20ff 343 movea.l #GFXDATA,a0
344 lea (font,pc),a1
d90ff128 345 VRAM_ADDR 0,(GFXCNTL)
346 move.w #128*8,d3
347font_loop:
348 moveq.l #8-1,d2
349 moveq.l #0,d1
350 move.b (a1)+,d0
3510:
352 lsr.b #1,d0
353 roxl.l #1,d1
354 ror.l #5,d1
355 dbra d2,0b
356
357 rol.l #1,d1 /* fixup */
358 move.l d1,(a0)
359 dbra d3,font_loop
4db6e09f 360
361 /* generate A layer map */
1286a1ba 362 movea.l #0xe000,a1
4db6e09f 363 move.l #28-1,d4
364lmaploop0:
1286a1ba 365 movea.l a1,a0
4db6e09f 366 jsr load_prepare
367
570c4371 368 move.l #64/2-1,d3
0fc4f06b 3690: move.l #0x00000000,(a0)
4db6e09f 370 dbra d3,0b
371
1286a1ba 372 add.l #64*2,a1
4db6e09f 373 dbra d4,lmaploop0
374
375 /* generate B layer map */
0fc4f06b 376 movea.l #0xc000,a0
4db6e09f 377 jsr load_prepare
378
570c4371 379 move.l #64*28/2-1,d3
0fc4f06b 3800: move.l #0x00000000,(a0)
4db6e09f 381 dbra d3,0b
382
383 /* upload sprite data */
0fc4f06b 384 movea.l #0xfc00,a0
4db6e09f 385 jsr load_prepare
318e20ff 386 lea (sprite_data,pc),a1
4db6e09f 387
388 move.l #(sprite_data_end-sprite_data)/2-1,d3
0fc4f06b 3890: move.l (a1)+,(a0)
4db6e09f 390 dbra d3,0b
391
318e20ff 392.if USE_VINT
d4279640 393 /* wait for vsync before unmask */
318e20ff 394 jsr wait_vsync_poll
d4279640 395
74d5977b 396 /* wait a bit to avoid nested vint */
397 move.w #20,d0
3980:
399 dbra d0,0b /* 10 cycles to go back */
400
318e20ff 401 /* enable and unmask vint */
402 write_vdp_r_dst 1,(VDP1_E_VBI | VDP1_E_DISPLAY | VDP1_MODE5),(GFXCNTL)
74d5977b 403 move.w #0x2000,sr
318e20ff 404.endif
570c4371 405
4db6e09f 406##################################################
1286a1ba 407
4db6e09f 408forever:
318e20ff 409.if USE_VINT
4db6e09f 410 jsr wait_vsync
318e20ff 411.else
412 jsr wait_vsync_poll
413 jsr VBL
414.endif
4db6e09f 415 bra forever
4db6e09f 416
417
d4279640 418INT:
419 /* let's hope VRAM is already set up.. */
318e20ff 420 lea (txt_exc,pc),a0
d4279640 421 move.l #9,d0
422 move.l #27,d1
423 move.l #0xe000,d2
424 jsr print
425 bra forever
426
427##################################################
428
1286a1ba 429VBL:
fbad1b76 430 addq.b #1,d7
d90ff128 431# movem.l d0-d4/a0-a5,-(a7)
1286a1ba 432
8689c962 433 btst.b #5,(0xa10005).l
434 bne no_auto_transfer
435 change_mode MMODE_PC, MMODE_MAIN
436 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL)
437
438no_auto_transfer:
fbad1b76 439 moveq.l #0,d0
440 move.w d7,d0
441 lsr.w #6,d0
442 and.w #0x1c,d0
318e20ff 443 lea (jumptab,pc,d0),a0
fbad1b76 444 jmp (a0)
445jumptab:
318e20ff 446 bra mode_main
447 bra mode_val_input
448 bra mode_edit_val /* edit val in editor */
449 bra mode_goto
450 bra mode_start_menu
451 bra mode_goto_predef
452 bra mode_jmp_addr
80560599 453 bra mode_transfer
fbad1b76 454
455##################### main #######################
456
457mode_main:
d4279640 458 /* assume we will hang */
318e20ff 459 lea (txt_dtack_err,pc),a0
d4279640 460 move.l #9,d0
461 move.l #27,d1
462 move.l #0xe000,d2
463 jsr print
464
465 moveq.l #0,d1
1286a1ba 466 move.l a6,d0
4276cd7a 467 move.b d0,d1
1286a1ba 468 lsr.l #8,d0
469 move.l d0,a1 /* current addr */
4276cd7a 470 lsr.b #3,d1
471 neg.b d1
472 add.b #27-1,d1 /* line where the cursor sits */
473 swap d1
1286a1ba 474
27d5cc88 475 movea.l #0xe002,a2
4276cd7a 476 move.l #27-1,d5 /* line counter for dbra */
477 or.l d1,d5
1286a1ba 478
27d5cc88 479draw_row:
1286a1ba 480 move.l a2,a0
481 jsr load_prepare
482
27d5cc88 483 btst.l #15,d7
484 beq 0f
485 move.w #' ',(a0)
4860:
1286a1ba 487 /* addr */
488 move.l a1,d2
489 moveq.l #6,d3
490 jsr print_hex_preped
491
27d5cc88 492 btst.l #4,d6
493 bne draw_row_safe
494
d4279640 495 bsr get_safety_mask
496 cmp.b #0xf,d0
497 beq draw_row_safe
27d5cc88 498
d4279640 499# unsafe or partially safe
500draw_row_hsafe:
501 move.l d0,d4
502 swap d4 /* mask in upper word */
27d5cc88 503 btst.l #15,d7
d4279640 504 bne draw_row_hsafe_words_pre
27d5cc88 505
d4279640 506draw_row_hsafe_bytes_pre:
27d5cc88 507 /* 8 bytes */
d4279640 508 moveq.l #2,d3
509 move.w #3,d4
510
511draw_row_hsafe_bytes:
27d5cc88 512 move.w #' ',(a0)
d4279640 513 move.b d4,d0
514 add.b #16,d0
515 btst.l d0,d4
516 bne 0f
27d5cc88 517 move.l #'?'|('?'<<16),(a0)
d4279640 518 move.w #' ',(a0)
519 move.l #'?'|('?'<<16),(a0)
520 bra 1f
5210:
522 move.b (0,a1),d2
523 jsr print_hex_preped
524 move.w #' ',(a0)
525 move.b (1,a1),d2
526 jsr print_hex_preped
5271:
528 addq.l #2,a1
529 dbra d4,draw_row_hsafe_bytes
27d5cc88 530
531 move.w #' ',(a0)
532
533 move.l d5,d0
534 swap d0
535 cmp.w d5,d0
536 beq draw_cursor_unsafe_byte
d4279640 537 bra draw_chars_hsafe_pre
27d5cc88 538
d4279640 539draw_row_hsafe_words_pre:
27d5cc88 540 /* 4 shorts */
d4279640 541 moveq.l #4,d3
542 move.w #3,d4
543
544draw_row_hsafe_words:
27d5cc88 545 move.w #' ',(a0)
d4279640 546 move.b d4,d0
547 add.b #16,d0
548 btst.l d0,d4
549 bne 0f
27d5cc88 550 move.l #'?'|('?'<<16),(a0)
551 move.l #'?'|('?'<<16),(a0)
d4279640 552 bra 1f
5530:
554 move.w (a1),d2
555 jsr print_hex_preped
5561:
557 addq.l #2,a1
558 dbra d4,draw_row_hsafe_words
27d5cc88 559
560 move.l #(' '<<16)|' ',(a0)
561
562 move.l d5,d0
563 swap d0
564 cmp.w d5,d0
565 beq draw_cursor_unsafe_word
566
d4279640 567draw_chars_hsafe_pre:
568 subq.l #8,a1
569 move.w #3,d4
570 moveq.l #0,d0
571
572draw_chars_hsafe:
573 move.b d4,d0
574 add.b #16,d0
575 btst.l d0,d4
576 bne 0f
27d5cc88 577 move.l #'?'|('?'<<16),(a0)
d4279640 578 bra draw_chars_hsafe_next
5790:
580 btst.l #15,d7 /* must perform correct read type */
581 bne 0f /* doing byte reads on security reg hangs */
582 move.b (0,a1),d0
583 lsl.l #8,d0
584 move.b (1,a1),d0
585 bra 1f
5860:
587 move.w (a1),d0
5881:
589 ror.l #8,d0
590 move.b d0,d1
591 sub.b #0x20,d1
592 cmp.b #0x60,d1
593 blo 0f
594 move.b #'.',d0
5950:
596 move.w d0,(a0)
597
598 move.b #0,d0
599 rol.l #8,d0
600 move.b d0,d1
601 sub.b #0x20,d1
602 cmp.b #0x60,d1
603 blo 0f
604 move.b #'.',d0
6050:
606 move.w d0,(a0)
607
608draw_chars_hsafe_next:
609 addq.l #2,a1
610 dbra d4,draw_chars_hsafe
27d5cc88 611
612 move.l #(' '<<16)|' ',(a0)
27d5cc88 613 add.w #0x80,a2
614 dbra d5,draw_row
615 bra draw_status_bar
616
617
618# normal draw
619draw_row_safe:
620 btst.l #15,d7
621 bne draw_row_words
622
623draw_row_bytes:
624 /* 8 bytes */
625 moveq.l #2,d3
626 moveq.l #8-1,d4
627draw_bytes:
628 move.w #' ',(a0)
629 move.b (a1)+,d2
630 jsr print_hex_preped
631 dbra d4,draw_bytes
632
633 move.w #' ',(a0)
634
635 move.l d5,d0
636 swap d0
637 cmp.w d5,d0
638 beq draw_cursor_byte
639 bra draw_chars_pre
640
641draw_row_words:
1286a1ba 642 /* 4 shorts */
4276cd7a 643 moveq.l #4,d3
1286a1ba 644 moveq.l #4-1,d4
27d5cc88 645draw_words:
1286a1ba 646 move.w #' ',(a0)
647 move.w (a1)+,d2
1286a1ba 648 jsr print_hex_preped
27d5cc88 649 dbra d4,draw_words
650
651 move.l #(' '<<16)|' ',(a0)
1286a1ba 652
4276cd7a 653 move.l d5,d0
654 swap d0
655 cmp.w d5,d0
27d5cc88 656 beq draw_cursor_word
4276cd7a 657
658draw_chars_pre:
1286a1ba 659 /* 8 chars */
660 subq.l #8,a1
661 moveq.l #8-1,d4
662draw_chars:
663 move.b (a1)+,d0
664 move.b d0,d1
665 sub.b #0x20,d1
666 cmp.b #0x60,d1
667 blo 0f
668 move.w #'.',d0
6690:
670 move.w d0,(a0)
671 dbra d4,draw_chars
672
27d5cc88 673 move.l #(' '<<16)|' ',(a0)
674
1286a1ba 675 add.w #0x80,a2
27d5cc88 676 dbra d5,draw_row
1286a1ba 677
d4279640 678
27d5cc88 679draw_status_bar:
4276cd7a 680 /* status bar */
27d5cc88 681 move.l a2,a0
4276cd7a 682 jsr load_prepare
27d5cc88 683
684 btst.l #15,d7
685 beq 0f
686 move.w #' ',(a0)
6870:
4dfddc2f 688 mk_a6_addr d2
4276cd7a 689 move.l #0x4006,d3
690 jsr print_hex_preped
d4279640 691
692 /* clear error */
693 moveq.l #5-1,d0
6940:
695 move.l #' '|(' '<<16),(a0)
696 move.l #' '|(' '<<16),(a0)
697 dbra d0,0b
698
4276cd7a 699
1286a1ba 700 /* handle input */
701 jsr get_input /* x0cbrldu x1sa00du */
1286a1ba 702
fbad1b76 703 btst.l #16+4,d0 /* A - scroll modifier */
704 beq input_noa
705
706 do_dpad 16+0, sub, #0x0800
707 do_dpad 16+1, add, #0x0800
708 do_dpad 16+10, sub, #0xd800
709 do_dpad 16+11, add, #0xd800
710input_noa:
711 moveq.l #0,d1
4dfddc2f 712 move.w d7,d1
713 lsr.w #7,d1
714 lsr.w #7,d1
fbad1b76 715
716 do_dpad 0, subq, #0x0008
717 do_dpad 1, addq, #0x0008
718 do_dpad 10, sub, d1
719 do_dpad 11, add, d1
720
721dpad_end:
4dfddc2f 722 /* update addr */
723 move.l a6,d1
724 cmp.b #0xf0,d1
725 blo 0f
726 sub.l #0xd800,a6
727 add.w #0x00d8,a6
728 bra 1f
7290:
730 cmp.b #0xd8,d1
731 blo 1f
732 add.l #0xd800,a6
733 sub.w #0x00d8,a6
7341:
735
736 /* other btns */
fbad1b76 737 moveq.l #0,d1
738 btst.l #12,d0 /* B - switch byte/word mode */
739 beq input_nob
4dfddc2f 740 bclr.l #15,d7
741 add.w #0x4000,d7 /* changes between 01 10 */
fbad1b76 742 move.l a6,d1
743 and.l #1,d1
744 sub.l d1,a6 /* make even, just in case */
745
746input_nob:
747 btst.l #13,d0 /* C - edit selected byte */
748 beq input_noc
4dfddc2f 749
750 change_mode MMODE_EDIT_VAL, MMODE_MAIN
27d5cc88 751 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL)
fbad1b76 752
753input_noc:
27d5cc88 754 btst.l #5,d0 /* Start - menu */
4dfddc2f 755 beq input_nos
756
27d5cc88 757 moveq.l #0,d5
758 change_mode MMODE_START_MENU, MMODE_MAIN
759 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL)
1286a1ba 760
4dfddc2f 761input_nos:
fbad1b76 762vbl_end:
d90ff128 763# movem.l (a7)+,d0-d4/a0-a5
318e20ff 764.if USE_VINT
1286a1ba 765 rte
318e20ff 766.else
767 rts
768.endif
1286a1ba 769
770
27d5cc88 771draw_cursor_unsafe_byte:
772 move.l a6,d0
773 and.l #7,d0 /* byte offs */
774 move.b d0,d1
775 add.b d0,d0
776 add.b d1,d0 /* d0 *= 3 (chars) */
777 add.b d0,d0
778 lea (7*2,a2,d0),a0
779 jsr load_prepare
780 move.l #(0x2000|'?'|((0x2000|'?')<<16)),(a0)
781
782 move.l a2,a0
783 add.w #31*2,a0
784 jsr load_prepare /* restore a0 */
318e20ff 785 bra draw_chars_hsafe_pre
27d5cc88 786
787draw_cursor_unsafe_word:
4276cd7a 788 move.l a6,d0
789 and.l #7,d0 /* byte offs */
790 move.l d0,d1
791 lsr.b #1,d1 /* which word */
792 move.b d1,d2
793 lsl.b #2,d2
794 add.b d2,d1 /* num of chars to skip */
27d5cc88 795 add.b d1,d1
796
797 lea (8*2,a2,d1),a0
798 jsr load_prepare
799 move.l #(0x2000|'?'|((0x2000|'?')<<16)),d0
800 move.l d0,(a0)
801 move.l d0,(a0)
802
803 move.l a2,a0
804 add.w #29*2,a0
805 jsr load_prepare /* restore a0 */
318e20ff 806 bra draw_chars_hsafe_pre
4276cd7a 807
4276cd7a 808
fbad1b76 809draw_cursor_byte:
27d5cc88 810 move.l a6,d0
811 and.l #7,d0 /* byte offs */
812 move.w #0x2002,d3
813
fbad1b76 814 move.b (-8,a1,d0),d2
27d5cc88 815 move.b d0,d1
816 add.b d0,d0
817 add.b d1,d0 /* d0 *= 3 (chars) */
818 add.b d0,d0
819 lea (7*2,a2,d0),a0
820 jsr load_prepare
821 jsr print_hex_preped
822
823 move.l a2,a0
824 add.w #31*2,a0
825 jsr load_prepare /* restore a0 */
826
318e20ff 827 bra draw_chars_pre
fbad1b76 828
829draw_cursor_word:
27d5cc88 830 move.l a6,d0
831 and.l #7,d0 /* byte offs */
832 move.l d0,d1
833 lsr.b #1,d1 /* which word */
834 move.b d1,d2
835 lsl.b #2,d2
836 add.b d2,d1 /* num of chars to skip */
837 add.b d1,d1
838 move.w #0x2004,d3
839
fbad1b76 840 move.w (-8,a1,d0),d2
27d5cc88 841 lea (8*2,a2,d1),a0
4276cd7a 842 jsr load_prepare
4276cd7a 843 jsr print_hex_preped
844
845 move.l a2,a0
27d5cc88 846 add.w #29*2,a0
4276cd7a 847 jsr load_prepare /* restore a0 */
848
318e20ff 849 bra draw_chars_pre
4276cd7a 850
851
4dfddc2f 852#################### hedit #######################
853
854mode_edit_val:
855 btst.l #7,d6
856 bne mode_hedit_finish
857
858 /* read val to edit */
5f6473d9 859 moveq.l #0,d5
4dfddc2f 860 mk_a6_addr d1
861 move.l d1,a0
4dfddc2f 862 btst.l #15,d7
863 bne 0f
5f6473d9 864 move.b (a0),d5
865 lsl.l #8,d5
866 or.b #1,d5
4dfddc2f 867 bra 1f
8680:
5f6473d9 869 move.w (a0),d5
870 lsl.l #8,d5
871 or.b #2,d5
4dfddc2f 8721:
4dfddc2f 873
4dfddc2f 874 change_mode MMODE_VAL_INPUT, MMODE_EDIT_VAL
318e20ff 875 bra vbl_end
4dfddc2f 876
877mode_hedit_finish:
878 /* write the val */
879 mk_a6_addr d1
880 move.l d1,a0
5f6473d9 881 lsr.l #8,d5
4dfddc2f 882
883 btst.l #15,d7
884 bne 0f
5f6473d9 885 move.b d5,(a0)
4dfddc2f 886 bra 1f
8870:
5f6473d9 888 move.w d5,(a0)
4dfddc2f 8891:
890
4dfddc2f 891 bra return_to_main
892
893##################### goto #######################
894
895mode_goto:
896 btst.l #7,d6
897 bne mode_goto_finish
fbad1b76 898
5f6473d9 899 moveq.l #0,d5
900 swap d6
901 move.w d6,d5
902 swap d6
903 swap d5
904 or.b #3,d5 /* 3 bytes */
4dfddc2f 905 bclr.l #7,d6
906 change_mode MMODE_VAL_INPUT, MMODE_GOTO
318e20ff 907 bra vbl_end
4dfddc2f 908
909mode_goto_finish:
5f6473d9 910 lsr.l #8,d5
911 move.l d5,d0
4dfddc2f 912 move.l d0,d1
913 and.l #7,d1
914 and.b #0xf8,d0
915 lsl.l #8,d0
916 or.l d1,d0
917 move.l d0,a6
918
5f6473d9 919 lsr.l #8,d5
920 swap d6
921 move.w d5,d6
922 swap d6
923
4dfddc2f 924 bra return_to_main
925
926################### val edit #####################
927
928mode_val_input:
929 /* frame */
930 movea.l #0xe000+14*2+11*64*2,a1
931 moveq.l #6-1,d1
9320:
933 move.w a1,a0
934 jsr load_prepare
935 moveq.l #11-1,d0
9361:
937 move.w #0,(a0)
938 dbra d0,1b
939
940 add.w #64*2,a1
941 dbra d1,0b
942
943 /* text */
318e20ff 944 lea (txt_edit,pc),a0
4dfddc2f 945 move.l #15,d0
946 move.l #11,d1
947 move.l #0xc000,d2
948 jsr print
949
318e20ff 950 lea (txt_a_confirm,pc),a0
4dfddc2f 951 move.l #15,d0
952 move.l #15,d1
953 move.l #0xc000,d2
954 jsr print
955
956 /* edit field */
957 moveq.l #0,d0
958 moveq.l #0,d1
959 moveq.l #0,d3
5f6473d9 960 move.b d5,d3
961 and.b #3,d3 /* edit field bytes */
4dfddc2f 962
963 move.b #19,d0
964 sub.b d3,d0
965 move.b #13,d1
5f6473d9 966 move.l d5,d2
4dfddc2f 967 lsr.l #8,d2
968 add.b d3,d3
969 or.w #0x8000,d3
970 jsr print_hex
971
972 /* current char */
973 moveq.l #0,d0
974 moveq.l #0,d1
975
976 and.w #6,d3
977 move.b #19,d0
978 move.b d3,d1
979 lsr.b #1,d1 /* length in bytes */
980 sub.b d1,d0
5f6473d9 981 move.b d5,d1
982 lsr.b #2,d1
4dfddc2f 983 and.b #7,d1 /* nibble to edit */
984 add.b d1,d0
985
986 sub.b d1,d3
987 sub.b #1,d3 /* chars to shift out */
988 lsl.b #2,d3
989 add.b #8,d3
5f6473d9 990 move.l d5,d2
4dfddc2f 991 lsr.l d3,d2
992
993 move.b #13,d1
994 move.w #0xa001,d3
995 jsr print_hex
996
997 /* handle input */
998 jsr get_input /* x0cbrldu x1sa00du */
999
1000 move.w d0,d1
1001 and.w #0x0f00,d1
1002 beq ai_no_dpad
5f6473d9 1003 move.b d5,d1
1004 and.b #3,d1
4dfddc2f 1005 add.b d1,d1 /* nibble count */
1006 sub.b #1,d1 /* max n.t.e. val */
5f6473d9 1007 move.b d5,d2
1008 lsr.b #2,d2
4dfddc2f 1009 and.b #7,d2 /* nibble to edit */
1010
1011 move.b d0,d3
1012 and.b #3,d3
1013 beq ai_no_ud
1014 moveq.l #0,d3
1015 moveq.l #0,d4
1016 move.b #0xf,d3
1017 move.b #0x1,d4
1018 sub.b d2,d1
1019 lsl.b #2,d1
1020 add.b #8,d1
1021 lsl.l d1,d3 /* mask */
1022 lsl.l d1,d4 /* what to add/sub */
5f6473d9 1023 move.l d5,d1
4dfddc2f 1024 and.l d3,d1
1025 btst.l #8,d0
1026 beq 0f
1027 add.l d4,d1
1028 bra 1f
10290:
1030 sub.l d4,d1
10311:
1032 and.l d3,d1
1033 eor.l #0xffffffff,d3
5f6473d9 1034 and.l d3,d5
1035 or.l d1,d5
318e20ff 1036 bra vbl_end
4dfddc2f 1037
1038ai_no_ud:
1039 btst.l #10,d0
1040 bne 0f
1041 add.b #1,d2
1042 bra 1f
10430:
1044 sub.b #1,d2
10451:
1046 cmp.b #0,d2
1047 bge 0f
1048 move.b d1,d2
10490:
1050 cmp.b d1,d2
1051 ble 0f
1052 move.b #0,d2
10530:
5f6473d9 1054 and.b #0xe3,d5
1055 lsl.b #2,d2
1056 or.b d2,d5
318e20ff 1057 bra vbl_end
4dfddc2f 1058
1059ai_no_dpad:
1060 move.w d0,d1
1061 and.w #0x1020,d1
1062 beq ai_no_sb
1063
4dfddc2f 1064 bra return_to_main
1065
1066ai_no_sb:
5f6473d9 1067 btst.l #4,d0 /* A - confirm */
4dfddc2f 1068 beq ai_no_input
1069 bset.l #7,d6
5f6473d9 1070 move.w d7,d1 /* back to prev mode */
4dfddc2f 1071 and.w #0x3800,d1
1072 lsr.w #3,d1
1073 and.w #0xc0ff,d7
1074 or.w d1,d7
1075
1076ai_no_input:
318e20ff 1077 bra vbl_end
4dfddc2f 1078
1079
27d5cc88 1080################### start menu ###################
1081
1082mode_start_menu:
1083 /* frame */
1084 bsr start_menu_box
1085
1086 /* text */
1087 menu_text txt_about, 13, 9, 1
1088 menu_text txt_goto, 13, 11, 0
1089 menu_text txt_goto_predef, 13, 12, 0
d90ff128 1090 menu_text txt_jmp_addr, 13, 13, 0
80560599 1091 menu_text txt_dump, 13, 14, 0
1092 menu_text txt_dtack, 13, 15, 0
1093 menu_text txt_a_confirm, 13, 17, 2
27d5cc88 1094
1095 /* dtack safety on/off */
80560599 1096 movea.l #0xe000+26*2+15*64*2,a0
27d5cc88 1097 jsr load_prepare
1098 move.w #0x8000|'O',(a0)
1099 btst.l #4,d6
1100 bne 0f
1101 move.w #0x8000|'N',(a0)
1102 bra 1f
11030:
1104 move.w #0x8000|'F',(a0)
1105 move.w #0x8000|'F',(a0)
11061:
1107
1108 /* cursor */
1109 movea.l #0xe000+11*2+11*64*2,a0
1110 moveq.l #0,d0
1111 move.b d5,d0
80560599 1112 and.b #7,d0
27d5cc88 1113 lsl.w #7,d0
1114 add.w d0,a0
1115 jsr load_prepare
1116 move.w #'>',(a0)
1117
1118 /* input */
1119 jsr get_input /* x0cbrldu x1sa00du */
1120
1121 move.w d0,d1
1122 and.w #3,d1
1123 beq msm_no_ud
1124 move.b d5,d1
80560599 1125 and.b #7,d1
27d5cc88 1126 btst.l #0,d0
1127 sne d2
1128 or.b #1,d2 /* up -1, down 1 */
1129 add.b d2,d1
1130 cmp.b #0,d1
1131 bge 0f
80560599 1132 move.b #4,d1
27d5cc88 11330:
80560599 1134 cmp.b #4,d1
27d5cc88 1135 ble 0f
1136 move.b #0,d1
11370:
80560599 1138 and.b #0xf8,d5
27d5cc88 1139 or.b d1,d5
318e20ff 1140 bra vbl_end
27d5cc88 1141
1142msm_no_ud:
1143 btst.l #4,d0 /* A - confirm */
1144 beq msm_no_a
1145 move.b d5,d1
80560599 1146 and.b #7,d1
27d5cc88 1147 bne 0f
1148 change_mode MMODE_GOTO, MMODE_MAIN
1149 bsr start_menu_box
318e20ff 1150 bra vbl_end
27d5cc88 11510:
1152 cmp.b #1,d1
1153 bne 0f
1154 moveq.l #0,d5
1155 change_mode MMODE_GOTO_PREDEF, MMODE_MAIN
1156 bsr start_menu_box
318e20ff 1157 bra vbl_end
27d5cc88 11580:
1159 cmp.b #2,d1
1160 bne 0f
d90ff128 1161 change_mode MMODE_JMP_ADDR, MMODE_MAIN
1162 bsr start_menu_box
318e20ff 1163 bra vbl_end
d90ff128 11640:
1165 cmp.b #3,d1
1166 bne 0f
8689c962 1167 change_mode MMODE_PC, MMODE_MAIN
80560599 1168 bsr start_menu_box
1169 bra vbl_end
11700:
1171 cmp.b #4,d1
1172 bne 0f
27d5cc88 1173 bchg.l #4,d6
318e20ff 1174 bra vbl_end
27d5cc88 11750:
1176
1177msm_no_a:
1178 move.w d0,d1
1179 and.w #0x3000,d1
1180 beq msm_no_bc
1181 bra return_to_main
1182
1183msm_no_bc:
318e20ff 1184 bra vbl_end
27d5cc88 1185
1186start_menu_box:
1187 movea.l #0xe000+10*2+8*64*2,a1
80560599 1188 move.w #11-1,d1
27d5cc88 11890:
1190 move.w a1,a0
1191 jsr load_prepare
1192 move.w #20-1,d0
11931:
1194 move.w #0,(a0)
1195 dbra d0,1b
1196
1197 add.w #64*2,a1
1198 dbra d1,0b
1199 rts
1200
1201################### goto predef ##################
1202
1203mode_goto_predef:
1204 /* frame */
1205 movea.l #0xe000+14*2+8*64*2,a1
1206 move.l #predef_addr_cnt+2-1,d1
12070:
1208 move.w a1,a0
1209 jsr load_prepare
1210 moveq.l #10-1,d0
12111:
1212 move.w #0,(a0)
1213 dbra d0,1b
1214
1215 add.w #64*2,a1
1216 dbra d1,0b
1217
1218 /* draw addresses */
1219 movea.l #0xe000+17*2+9*64*2,a1
318e20ff 1220 lea (predef_addrs,pc),a2
27d5cc88 1221 move.w #predef_addr_cnt-1,d4
1222 move.l #0x8006,d3
1223mgp_da_loop:
1224 move.w a1,a0
1225 jsr load_prepare
1226 move.l (a2)+,d2
1227 jsr print_hex_preped
1228 add.w #64*2,a1
1229 dbra d4,mgp_da_loop
1230
1231 /* cursor */
1232 movea.l #0xe000+15*2+9*64*2,a0
1233 moveq.l #0,d0
1234 move.b d5,d0
1235 lsl.w #7,d0
1236 add.w d0,a0
1237 jsr load_prepare
1238 move.w #'>',(a0)
1239
1240 /* input */
1241 jsr get_input /* x0cbrldu x1sa00du */
1242
1243 move.w d0,d1
1244 and.w #3,d1
1245 beq mgp_no_ud
1246 btst.l #0,d0
1247 sne d2
1248 or.b #1,d2 /* up -1, down 1 */
1249 add.b d2,d5
1250 cmp.b #0,d5
1251 bge 0f
1252 move.b #predef_addr_cnt-1,d5
12530:
1254 cmp.b #predef_addr_cnt-1,d5
1255 ble 0f
1256 move.b #0,d5
12570:
318e20ff 1258 bra vbl_end
27d5cc88 1259
1260mgp_no_ud:
1261 btst.l #4,d0 /* A - confirm */
1262 beq mgp_no_a
1263 moveq.l #0,d0
1264 move.b d5,d0
1265 lsl.w #2,d0
318e20ff 1266 lea (predef_addrs,pc),a0
27d5cc88 1267 move.l (a0,d0),d5
1268 lsl.l #8,d5
318e20ff 1269 bra mode_goto_finish
27d5cc88 1270
1271mgp_no_a:
1272 move.w d0,d1
1273 and.w #0x3000,d1
1274 beq mgp_no_bc
1275 bra return_to_main
1276
1277mgp_no_bc:
318e20ff 1278 bra vbl_end
27d5cc88 1279
d90ff128 1280##################### jmp ########################
1281
1282mode_jmp_addr:
1283 btst.l #7,d6
1284 bne mode_jmp_finish
1285
1286 moveq.l #0,d5
1287 or.b #3,d5 /* 3 bytes */
1288 bclr.l #7,d6
1289 change_mode MMODE_VAL_INPUT, MMODE_JMP_ADDR
318e20ff 1290 bra vbl_end
d90ff128 1291
1292mode_jmp_finish:
1293 lsr.l #8,d5
1294 write_vdp_r_dst 1,(VDP1_E_DISPLAY | VDP1_MODE5),(GFXCNTL) /* disable vint */
1295 move.l d5,a0
1296 jmp (a0)
1297
80560599 1298mode_transfer:
8689c962 1299 move.b #0x40,(0xa1000b).l /* port 2 ctrl */
1300 move.b #0x00,(0xa10005).l /* port 2 data - start with TH low */
80560599 1301
8689c962 1302 lea (txt_transfer_ready,pc),a0
80560599 1303 move.l #13,d0
1304 move.l #13,d1
1305 move.l #0x8000,d2
1306 jsr print
1307
1308wait_tl_low0:
1309 move.b (0xa10005),d0
1310 btst.b #4,d0
1311 bne wait_tl_low0
1312
1313 menu_text txt_working, 13, 13, 0
8689c962 1314 bra do_transfer
27d5cc88 1315
4dfddc2f 1316# go back to main mode
1317return_to_main:
5f6473d9 1318 bclr.l #7,d6 /* not edited */
4dfddc2f 1319 change_mode MMODE_MAIN, MMODE_MAIN
27d5cc88 1320 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320),(GFXCNTL)
318e20ff 1321 bra vbl_end
fbad1b76 1322
1323
4db6e09f 1324#################################################
1325# #
1326# Initialize VDP registers #
1327# #
1328#################################################
1329
1330init_gfx:
1331 move.l #GFXCNTL,a3
570c4371 1332 write_vdp_reg 0,(VDP0_E_DISPLAY | VDP0_PLTT_FULL)
318e20ff 1333 write_vdp_reg 1,(VDP1_E_DISPLAY | VDP1_MODE5)
4db6e09f 1334 write_vdp_reg 2,(0xe000 >> 10) /* Screen map a adress */
1335 write_vdp_reg 3,(0xe000 >> 10) /* Window address */
1336 write_vdp_reg 4,(0xc000 >> 13) /* Screen map b address */
1337 write_vdp_reg 5,(0xfc00 >> 9) /* Sprite address */
1338 write_vdp_reg 6,0
570c4371 1339 write_vdp_reg 7,0 /* Backdrop color */
80560599 1340 write_vdp_reg 0x0a,1 /* Lines per hblank interrupt */
1341 write_vdp_reg 0x0b,0 /* 2-cell vertical scrolling */
1342 write_vdp_reg 0x0c,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320)
1343 write_vdp_reg 0x0d,(0x8000 >> 10) /* Horizontal scroll address */
1344 write_vdp_reg 0x0e,0
1345 write_vdp_reg 0x0f,2
1346 write_vdp_reg 0x10,(VDP16_MAP_V32 | VDP16_MAP_H64) /* layer size */
1347 write_vdp_reg 0x11,0
1348 write_vdp_reg 0x12,0
4db6e09f 1349 rts
1350
1351
d4279640 1352# get mask of bits representing safe words
27d5cc88 1353# a1 - address to check
1354# destroys d0-d2, strips upper bits from a1
d4279640 1355get_safety_mask:
27d5cc88 1356 move.l a1,d1
1357 lsl.l #8,d1
1358 lsr.l #8,d1
318e20ff 1359 lea (safe_addrs,pc),a1
27d5cc88 1360 move.w #(safe_addrs_end - safe_addrs)/8-1,d2
13610:
1362 move.l (a1)+,d0
1363 cmp.l d0,d1
1364 blt 1f
1365 move.l (a1),d0
1366 cmp.l d0,d1
1367 ble addr_safe
13681:
1369 addq.l #4,a1
1370 dbra d2,0b
1371
27d5cc88 1372 move.l d1,a1
d4279640 1373
1374 moveq.l #0x0c,d0
1375 cmp.l #0xa14000,d1
1376 beq gsm_rts
1377
1378 moveq.l #0x08,d0
1379 cmp.l #0xa14100,d1
1380 beq gsm_rts
1381
1382 /* check for VDP address */
1383 move.l d1,d0
1384 swap d0
1385 and.b #0xe0,d0
1386 cmp.b #0xc0,d0
1387 bne addr_unsafe /* not vdp */
1388
1389 move.l d1,d0
1390 and.l #0x0700e0,d0
1391 bne addr_unsafe
1392
1393 move.l d1,d0
1394 and.b #0x1f,d0
1395 cmp.b #0x04,d0
1396 blt addr_hsafe_3 /* data port */
1397 cmp.b #0x10,d0
1398 blt addr_safe /* below PSG */
1399 cmp.b #0x18,d0
1400 bge addr_safe /* above PSG */
1401
1402addr_unsafe:
1403 moveq.l #0,d0 /* skip line */
1404 rts
1405
1406addr_hsafe_3:
1407 moveq.l #3,d0 /* skip 2 words */
27d5cc88 1408 rts
1409
1410addr_safe:
1411 move.l d1,a1
d4279640 1412 moveq.l #0xf,d0
1413gsm_rts:
27d5cc88 1414 rts
1415
1416
1286a1ba 1417# read single phase from controller
fbad1b76 1418# #a0 - addr
1286a1ba 1419# d0 - result
fbad1b76 1420# destroys d1,d2
1286a1ba 1421get_input:
1422 move.b #0x40,(0xa10003)
1423 nop
1424 nop
1425 nop
1426 move.b (0xa10003),d0
1427 move.b #0x00,(0xa10003)
1428 lsl.w #8,d0
1429 nop
1430 move.b (0xa10003),d0
1431 eor.w #0xffff,d0
fbad1b76 1432
1433 swap d7
1434 move.w d7,d1
1435 eor.w d0,d1 /* changed btns */
1436 move.w d0,d7 /* old val */
1437 swap d7
1438 and.w d0,d1 /* what changed now */
1439 bne 0f
1440
1441 addq.b #1,d6
1442 move.b d6,d2
27d5cc88 1443 and.b #0x0f,d2 /* do autorepeat */
1444 cmp.b #9,d2
fbad1b76 1445 bne 1f
1446 move.w d0,d1
14470:
27d5cc88 1448 and.b #0xf0,d6
fbad1b76 14491:
1450 swap d0
1451 move.w d1,d0
1286a1ba 1452 rts
1453
4dfddc2f 1454# Prepare to write to VDP RAM @a0
0fc4f06b 1455# sets a0 to VDP data port for convenience
1456# a0: VRAM base
1457# destroys d0
570c4371 1458
4db6e09f 1459load_prepare:
0fc4f06b 1460 VRAM_ADDR_var a0
1461 move.l d0,(GFXCNTL).l
1462 move.l #GFXDATA,a0
4db6e09f 1463 rts
1464
1465
0fc4f06b 1466# Load color data from ROM
1467# a0: CRAM base
1468# a1: color list address
1469# d0: number of colors to load
1470# destroys d1
4db6e09f 1471
1472load_colors:
0fc4f06b 1473 move.l d0,d1
1474 CRAM_ADDR_var a0
1475 move.l d0,(GFXCNTL).l
4db6e09f 1476
0fc4f06b 1477 move.l #GFXDATA,a0
1478 subq.w #1,d1
14790:
1480 move.w (a1)+,(a0)
1481 dbra d1,0b
4db6e09f 1482
1483 rts
1484
0fc4f06b 1485
1486# print
1487# a0 - string
1488# d0 - x
1489# d1 - y
4dfddc2f 1490# d2 - tile_bits[15:11]
0fc4f06b 1491# destroys a1
570c4371 1492
1493print:
0fc4f06b 1494 move.l a0,a1
1286a1ba 1495 XY2NT
0fc4f06b 1496 jsr load_prepare
4dfddc2f 1497 move.l d2,d0
1498 and.w #0xf800,d0
570c4371 1499
1500_print_loop:
0fc4f06b 1501 move.b (a1)+,d0
570c4371 1502 beq _print_end
1503
0fc4f06b 1504 move.w d0,(a0)
318e20ff 1505 bra _print_loop
570c4371 1506
1507_print_end:
1508 rts
1509
4db6e09f 1510
1286a1ba 1511# print_hex
1512# d0 - x
1513# d1 - y
1514# d2 - value
27d5cc88 1515# d3 - tile_bits[15:11]|digit_cnt[7:0]
4276cd7a 1516# destroys a0, preserves d3
1286a1ba 1517
1518print_hex:
1519 XY2NT
1520 jsr load_prepare
1521
1522print_hex_preped:
4276cd7a 1523 moveq.l #0,d0
1524 move.b d3,d0
1525 move.l d0,d1
1286a1ba 1526 lsl.b #2,d0
1527 ror.l d0,d2 /* prep value */
4276cd7a 1528 subq.l #1,d1 /* count */
1529 move.w d3,d0
1530 and.w #0xf800,d0 /* keep upper bits in d0 */
1286a1ba 1531
1532_print_hex_loop:
1533 rol.l #4,d2
1534 move.b d2,d0
1535 and.b #0xf,d0
1286a1ba 1536
1537 add.b #'0',d0
4276cd7a 1538 cmp.b #'9',d0
1539 ble 0f
1540 addq.b #7,d0
15410:
1286a1ba 1542 move.w d0,(a0)
4276cd7a 1543 dbra d1,_print_hex_loop
1286a1ba 1544
1545 rts
1546
1547
318e20ff 1548# wait vertical sync interrupt
4db6e09f 1549
1550wait_vsync:
fbad1b76 1551 move.b d7,d0
4db6e09f 1552_wait_change:
1553 stop #0x2000
fbad1b76 1554 cmp.b d7,d0
4db6e09f 1555 beq _wait_change
1556 rts
1557
1558
318e20ff 1559# wait vsync start (polling)
1560# destroys a0,d0
1561
1562wait_vsync_poll:
1563 move.l #GFXCNTL,a0
15640:
1565 move.w (a0),d0
1566 and.b #8,d0
1567 nop
1568 nop
1569 bne 0b
15700:
1571 move.w (a0),d0
1572 and.b #8,d0
1573 nop
1574 nop
1575 beq 0b
1576 rts
1577
1578
ff17c043 1579test_code:
ff17c043 1580 nop
ff17c043 1581
1582test_code_ret_op:
1583 jmp 0x123456 /* will be patched */
1584test_code_end:
1585
4db6e09f 1586#################################################
1587# #
1588# RAM DATA #
1589# #
1590#################################################
1591
1592.bss
570c4371 1593
fbad1b76 1594# nothing :)
4db6e09f 1595
1596.end
1597
1598# vim:filetype=asmM68k
Genesis/MegaDrive related projects