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hexed: relocation and test stub
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1###############################################################################
2#
3# Copyright (c) 2009, GraÅžvydas Ignotas
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#
17# THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY
18# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20# DISCLAIMED. IN NO EVENT SHALL <copyright holder> BE LIABLE FOR ANY
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#
31
32.equ USE_VINT, 0
33.equ COPY_TO_EXP, 1
34.equ RELOCATE_TO_RAM, 1
35
36.text
37.globl main
38.globl INT
39.globl VBL
40
41##################################################
42# #
43# Register and bitmask definitions #
44# #
45##################################################
46
47.equ GFXDATA, 0xc00000
48.equ GFXCNTL, 0xc00004
49
50.equ VDP0_E_HBI, 0x10
51.equ VDP0_E_DISPLAY, 0x02
52.equ VDP0_PLTT_FULL, 0x04
53
54.equ VDP1_SMS_MODE, 0x80
55.equ VDP1_E_DISPLAY, 0x40
56.equ VDP1_E_VBI, 0x20
57.equ VDP1_E_DMA, 0x10
58.equ VDP1_NTSC, 0x00
59.equ VDP1_PAL, 0x08
60.equ VDP1_MODE5, 0x04
61
62.equ VDP12_STE, 0x08
63.equ VDP12_SCREEN_V224, 0x00
64.equ VDP12_SCREEN_V448, 0x04
65.equ VDP12_PROGRESSIVE, 0x00
66.equ VDP12_INTERLACED, 0x02
67.equ VDP12_SCREEN_H256, 0x00
68.equ VDP12_SCREEN_H320, 0x81
69
70.equ VDP16_MAP_V32, 0x00
71.equ VDP16_MAP_V64, 0x10
72.equ VDP16_MAP_V128, 0x30
73.equ VDP16_MAP_H32, 0x00
74.equ VDP16_MAP_H64, 0x01
75.equ VDP16_MAP_H128, 0x03
76
77.equ MMODE_MAIN, 0
78.equ MMODE_VAL_INPUT, 1
79.equ MMODE_EDIT_VAL, 2
80.equ MMODE_GOTO, 3
81.equ MMODE_START_MENU, 4
82.equ MMODE_GOTO_PREDEF, 5
83.equ MMODE_JMP_ADDR, 6
84.equ MMODE_DUMP, 7
85
86.equ predef_addr_cnt, ((predef_addrs_end-predef_addrs)/4)
87
88##################################################
89# #
90# MACROS #
91# #
92##################################################
93
94
95# Write val to VDP register reg
96.macro write_vdp_r_dst reg val dst
97 move.w #((\reg << 8) + 0x8000 + \val),\dst
98.endm
99
100# Write val to VDP register reg, vdp addr in a3
101.macro write_vdp_reg reg val
102 write_vdp_r_dst \reg, \val, (a3)
103.endm
104
105# Set up address in VDP, control port in dst
106.macro VRAM_ADDR adr dst
107 move.l #(0x40000000 | ((\adr & 0x3fff) << 16) | (\adr >> 14)),\dst
108.endm
109
110.macro VSRAM_ADDR adr dst
111 move.l #(0x40000010 | ((\adr & 0x3fff) << 16) | (\adr >> 14)),\dst
112.endm
113
114
115# make VDP word from address adr and store in d0
116.macro XRAM_ADDR_var adr
117 move.l \adr,d0
118 lsl.l #8,d0
119 lsl.l #8,d0
120 rol.l #2,d0
121 lsl.b #2,d0
122 lsr.l #2,d0
123.endm
124
125
126.macro VRAM_ADDR_var adr
127 XRAM_ADDR_var \adr
128 or.l #0x40000000,d0
129.endm
130
131
132.macro CRAM_ADDR_var adr
133 XRAM_ADDR_var \adr
134 or.l #0xc0000000,d0
135.endm
136
137
138# convert tile coords in d0, d1 to nametable addr to a0
139.macro XY2NT
140 lsl.w #6,d1
141 add.w d1,d0
142 lsl.w #1,d0
143 movea.l #0xe000,a0
144 add.w d0,a0
145.endm
146
147# check if some d-pad button (and modifier) is pressed
148.macro do_dpad bit op val
149 btst.l #\bit,d0
150 beq 0f
151 \op.l \val,a6
152 bra dpad_end
1530:
154.endm
155
156# convert a6 to normal addr
157# destroys d0
158.macro mk_a6_addr reg
159 move.l a6,\reg
160 moveq.l #0,d0
161 move.b \reg,d0
162 lsr.l #8,\reg
163 add.l d0,\reg
164.endm
165
166.macro change_mode mode_new mode_back
167 and.w #0xc0ff,d7
168 or.w #(\mode_back<<11)|(\mode_new<<8),d7
169.endm
170
171# destroys a0,d0-d2
172.macro menu_text str x y pal
173 lea (\str,pc),a0
174 move.l #\x,d0
175 move.l #\y,d1
176 move.l #0x8000|(\pal<<13),d2
177 jsr print
178.endm
179
180#################################################
181# #
182# DATA #
183# #
184#################################################
185
186colors:
187 dc.w 0x0000,0x0eee,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
188 dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
189 dc.w 0x0000,0x02e2,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
190 dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
191 dc.w 0x0000,0x0e44,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
192 dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
193 dc.w 0x0000,0x044e,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
194 dc.w 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000
195colors_end:
196
197
198sprite_data:
199 /* Y size link attr X */
200 dc.w 0; dc.b 0x05; dc.b 0; dc.w 0x6002; dc.w 0
201sprite_data_end:
202
203predef_addrs:
204 dc.l 0x000000, 0x200000, 0x400000, 0xa00000, 0xa10000
205 dc.l 0xa11100, 0xa12000, 0xa13000, 0xa14000, 0xc00000
206predef_addrs_end:
207
208safe_addrs:
209 dc.l 0x000000, 0x7fffff
210 dc.l 0xe00000, 0xffffff
211 dc.l 0xa00000, 0xa100ff
212 dc.l 0xa11000, 0xa113ff
213 dc.l 0xa12000, 0xa120ff
214 dc.l 0xa13000, 0xa130ff
215safe_addrs_end:
216
217transfer_mode:
218 dc.l 0x000000 /* 1 for recv */
219transfer_addr:
220 dc.l 0x000000
221transfer_len:
222 dc.l 0x000800
223
224txt_edit:
225 .ascii "- edit -\0"
226txt_a_confirm:
227 .ascii "A-confirm\0"
228txt_about:
229 .ascii "hexed r2\0"
230txt_goto:
231 .ascii "Go to address\0"
232txt_goto_predef:
233 .ascii "Go to (predef)\0"
234txt_jmp_addr:
235 .ascii "Jump to address\0"
236txt_dump:
237 .ascii "Transfer\0"
238txt_dtack:
239 .ascii "DTACK safety\0"
240txt_ready_send:
241 .ascii "Ready to send\0"
242txt_ready_recv:
243 .ascii "Ready to recv\0"
244txt_working:
245 .ascii "Working.. \0"
246txt_dtack_err:
247 .ascii "DTACK err?\0"
248txt_exc:
249 .ascii "Exception \0"
250
251##################################################
252# #
253# MAIN PROGRAM #
254# #
255##################################################
256
257# global regs:
258# a6 = page_start[31:8]|cursor_offs[7:0]
259# d7 = old_inputs[31:16]|edit_bytes[15:14]|g_mode_old[13:11]|g_mode[10:8]|irq_cnt[7:0]
260# d6 = edit_word_save[31:15]|edit_done[7]|no_dtack_detect[4]|autorep_cnt[3:0]
261# d5 = main: tmp
262# edit: edit_word[31:8]|edit_pos[4:2]|byte_cnt[1:0]
263# menu: sel
264
265.align 2
266
267main:
268 /* mask irqs during init */
269 move.w #0x2700,sr
270
271.if COPY_TO_EXP
272 /* copy to expansion device if magic number is set */
273 move.l #0x400000,a1
274 cmp.w #0x1234,(a1)
275 bne 0f
276
277 move.l #0,a0
278 move.w #0x2000/8-1,d0
2791:
280 move.l (a0)+,(a1)+
281 move.l (a0)+,(a1)+
282 dbra d0,1b
2830:
284.endif
285
286.if RELOCATE_TO_RAM
287 /* we could be relocated by 32x or something else, adjust start addr */
288 lea (pc),a0
289 move.l a0,d0
290 and.l #0xff0000,d0
291 move.l d0,a0
292
293 /* copy, assume 8K size */
294 move.l #0xFF0100,a1
295 move.w #0x2000/8-1,d0
2961:
297 move.l (a0)+,(a1)+
298 move.l (a0)+,(a1)+
299 dbra d0,1b
300
301 /* copy test code */
302 lea (test_code,pc),a0
303 move.l #0xffc000,a1
304 move.w #(test_code_end - test_code)/2-1,d0
3051:
306 move.w (a0)+,(a1)+
307 dbra d0,1b
308
309 lea (0f,pc),a0
310 move.l a0,d0
311 and.l #0x00ffff,d0
312 add.l #0xFF0100,d0
313 move.l d0,a0
314
315 /* patch test code */
316 move.l #0xffc000,a1
317 add.w #(test_code_ret_op-test_code+2),a1
318 move.l a0,(a1)
319
320 jmp (a0)
3210:
322.endif
323
324 movea.l #0,a6
325 move.l #0x8000,d7
326 moveq.l #0,d6
327
328 /* Init pads */
329 move.b #0x40,(0xa10009).l
330 move.b #0x40,(0xa10003).l
331
332 /* Initialize VDP */
333 jsr init_gfx
334
335 /* Clear h/v scroll */
336 movea.l #GFXDATA,a0
337 VRAM_ADDR 0x8000,(GFXCNTL)
338 move.l #0,(a0)
339 VSRAM_ADDR 0,(GFXCNTL)
340 move.l #0,(a0)
341
342 /* Load color data */
343 movea.l #0,a0
344 lea (colors,pc),a1
345 moveq.l #(colors_end-colors)/2,d0
346 jsr load_colors
347
348 /* load font patterns */
349 movea.l #GFXDATA,a0
350 lea (font,pc),a1
351 VRAM_ADDR 0,(GFXCNTL)
352 move.w #128*8,d3
353font_loop:
354 moveq.l #8-1,d2
355 moveq.l #0,d1
356 move.b (a1)+,d0
3570:
358 lsr.b #1,d0
359 roxl.l #1,d1
360 ror.l #5,d1
361 dbra d2,0b
362
363 rol.l #1,d1 /* fixup */
364 move.l d1,(a0)
365 dbra d3,font_loop
366
367 /* generate A layer map */
368 movea.l #0xe000,a1
369 move.l #28-1,d4
370lmaploop0:
371 movea.l a1,a0
372 jsr load_prepare
373
374 move.l #64/2-1,d3
3750: move.l #0x00000000,(a0)
376 dbra d3,0b
377
378 add.l #64*2,a1
379 dbra d4,lmaploop0
380
381 /* generate B layer map */
382 movea.l #0xc000,a0
383 jsr load_prepare
384
385 move.l #64*28/2-1,d3
3860: move.l #0x00000000,(a0)
387 dbra d3,0b
388
389 /* upload sprite data */
390 movea.l #0xfc00,a0
391 jsr load_prepare
392 lea (sprite_data,pc),a1
393
394 move.l #(sprite_data_end-sprite_data)/2-1,d3
3950: move.l (a1)+,(a0)
396 dbra d3,0b
397
398.if USE_VINT
399 /* wait for vsync before unmask */
400 jsr wait_vsync_poll
401
402 /* wait a bit to avoid nested vint */
403 move.w #20,d0
4040:
405 dbra d0,0b /* 10 cycles to go back */
406
407 /* enable and unmask vint */
408 write_vdp_r_dst 1,(VDP1_E_VBI | VDP1_E_DISPLAY | VDP1_MODE5),(GFXCNTL)
409 move.w #0x2000,sr
410.endif
411
412##################################################
413
414forever:
415.if USE_VINT
416 jsr wait_vsync
417.else
418 jsr wait_vsync_poll
419 jsr VBL
420.endif
421 bra forever
422
423
424INT:
425 /* let's hope VRAM is already set up.. */
426 lea (txt_exc,pc),a0
427 move.l #9,d0
428 move.l #27,d1
429 move.l #0xe000,d2
430 jsr print
431 bra forever
432
433##################################################
434
435VBL:
436 addq.b #1,d7
437# movem.l d0-d4/a0-a5,-(a7)
438
439 moveq.l #0,d0
440 move.w d7,d0
441 lsr.w #6,d0
442 and.w #0x1c,d0
443 lea (jumptab,pc,d0),a0
444 jmp (a0)
445jumptab:
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
453 bra mode_transfer
454
455##################### main #######################
456
457mode_main:
458 /* assume we will hang */
459 lea (txt_dtack_err,pc),a0
460 move.l #9,d0
461 move.l #27,d1
462 move.l #0xe000,d2
463 jsr print
464
465 moveq.l #0,d1
466 move.l a6,d0
467 move.b d0,d1
468 lsr.l #8,d0
469 move.l d0,a1 /* current addr */
470 lsr.b #3,d1
471 neg.b d1
472 add.b #27-1,d1 /* line where the cursor sits */
473 swap d1
474
475 movea.l #0xe002,a2
476 move.l #27-1,d5 /* line counter for dbra */
477 or.l d1,d5
478
479draw_row:
480 move.l a2,a0
481 jsr load_prepare
482
483 btst.l #15,d7
484 beq 0f
485 move.w #' ',(a0)
4860:
487 /* addr */
488 move.l a1,d2
489 moveq.l #6,d3
490 jsr print_hex_preped
491
492 btst.l #4,d6
493 bne draw_row_safe
494
495 bsr get_safety_mask
496 cmp.b #0xf,d0
497 beq draw_row_safe
498
499# unsafe or partially safe
500draw_row_hsafe:
501 move.l d0,d4
502 swap d4 /* mask in upper word */
503 btst.l #15,d7
504 bne draw_row_hsafe_words_pre
505
506draw_row_hsafe_bytes_pre:
507 /* 8 bytes */
508 moveq.l #2,d3
509 move.w #3,d4
510
511draw_row_hsafe_bytes:
512 move.w #' ',(a0)
513 move.b d4,d0
514 add.b #16,d0
515 btst.l d0,d4
516 bne 0f
517 move.l #'?'|('?'<<16),(a0)
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
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
537 bra draw_chars_hsafe_pre
538
539draw_row_hsafe_words_pre:
540 /* 4 shorts */
541 moveq.l #4,d3
542 move.w #3,d4
543
544draw_row_hsafe_words:
545 move.w #' ',(a0)
546 move.b d4,d0
547 add.b #16,d0
548 btst.l d0,d4
549 bne 0f
550 move.l #'?'|('?'<<16),(a0)
551 move.l #'?'|('?'<<16),(a0)
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
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
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
577 move.l #'?'|('?'<<16),(a0)
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
611
612 move.l #(' '<<16)|' ',(a0)
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:
642 /* 4 shorts */
643 moveq.l #4,d3
644 moveq.l #4-1,d4
645draw_words:
646 move.w #' ',(a0)
647 move.w (a1)+,d2
648 jsr print_hex_preped
649 dbra d4,draw_words
650
651 move.l #(' '<<16)|' ',(a0)
652
653 move.l d5,d0
654 swap d0
655 cmp.w d5,d0
656 beq draw_cursor_word
657
658draw_chars_pre:
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
673 move.l #(' '<<16)|' ',(a0)
674
675 add.w #0x80,a2
676 dbra d5,draw_row
677
678
679draw_status_bar:
680 /* status bar */
681 move.l a2,a0
682 jsr load_prepare
683
684 btst.l #15,d7
685 beq 0f
686 move.w #' ',(a0)
6870:
688 mk_a6_addr d2
689 move.l #0x4006,d3
690 jsr print_hex_preped
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
699
700 /* handle input */
701 jsr get_input /* x0cbrldu x1sa00du */
702
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
712 move.w d7,d1
713 lsr.w #7,d1
714 lsr.w #7,d1
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:
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 */
737 moveq.l #0,d1
738 btst.l #12,d0 /* B - switch byte/word mode */
739 beq input_nob
740 bclr.l #15,d7
741 add.w #0x4000,d7 /* changes between 01 10 */
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
749
750 change_mode MMODE_EDIT_VAL, MMODE_MAIN
751 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320 | VDP12_STE),(GFXCNTL)
752
753input_noc:
754 btst.l #5,d0 /* Start - menu */
755 beq input_nos
756
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)
760
761input_nos:
762vbl_end:
763# movem.l (a7)+,d0-d4/a0-a5
764.if USE_VINT
765 rte
766.else
767 rts
768.endif
769
770
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 */
785 bra draw_chars_hsafe_pre
786
787draw_cursor_unsafe_word:
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 */
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 */
806 bra draw_chars_hsafe_pre
807
808
809draw_cursor_byte:
810 move.l a6,d0
811 and.l #7,d0 /* byte offs */
812 move.w #0x2002,d3
813
814 move.b (-8,a1,d0),d2
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
827 bra draw_chars_pre
828
829draw_cursor_word:
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
840 move.w (-8,a1,d0),d2
841 lea (8*2,a2,d1),a0
842 jsr load_prepare
843 jsr print_hex_preped
844
845 move.l a2,a0
846 add.w #29*2,a0
847 jsr load_prepare /* restore a0 */
848
849 bra draw_chars_pre
850
851
852#################### hedit #######################
853
854mode_edit_val:
855 btst.l #7,d6
856 bne mode_hedit_finish
857
858 /* read val to edit */
859 moveq.l #0,d5
860 mk_a6_addr d1
861 move.l d1,a0
862 btst.l #15,d7
863 bne 0f
864 move.b (a0),d5
865 lsl.l #8,d5
866 or.b #1,d5
867 bra 1f
8680:
869 move.w (a0),d5
870 lsl.l #8,d5
871 or.b #2,d5
8721:
873
874 change_mode MMODE_VAL_INPUT, MMODE_EDIT_VAL
875 bra vbl_end
876
877mode_hedit_finish:
878 /* write the val */
879 mk_a6_addr d1
880 move.l d1,a0
881 lsr.l #8,d5
882
883 btst.l #15,d7
884 bne 0f
885 move.b d5,(a0)
886 bra 1f
8870:
888 move.w d5,(a0)
8891:
890
891 bra return_to_main
892
893##################### goto #######################
894
895mode_goto:
896 btst.l #7,d6
897 bne mode_goto_finish
898
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 */
905 bclr.l #7,d6
906 change_mode MMODE_VAL_INPUT, MMODE_GOTO
907 bra vbl_end
908
909mode_goto_finish:
910 lsr.l #8,d5
911 move.l d5,d0
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
919 lsr.l #8,d5
920 swap d6
921 move.w d5,d6
922 swap d6
923
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 */
944 lea (txt_edit,pc),a0
945 move.l #15,d0
946 move.l #11,d1
947 move.l #0xc000,d2
948 jsr print
949
950 lea (txt_a_confirm,pc),a0
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
960 move.b d5,d3
961 and.b #3,d3 /* edit field bytes */
962
963 move.b #19,d0
964 sub.b d3,d0
965 move.b #13,d1
966 move.l d5,d2
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
981 move.b d5,d1
982 lsr.b #2,d1
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
990 move.l d5,d2
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
1003 move.b d5,d1
1004 and.b #3,d1
1005 add.b d1,d1 /* nibble count */
1006 sub.b #1,d1 /* max n.t.e. val */
1007 move.b d5,d2
1008 lsr.b #2,d2
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 */
1023 move.l d5,d1
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
1034 and.l d3,d5
1035 or.l d1,d5
1036 bra vbl_end
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:
1054 and.b #0xe3,d5
1055 lsl.b #2,d2
1056 or.b d2,d5
1057 bra vbl_end
1058
1059ai_no_dpad:
1060 move.w d0,d1
1061 and.w #0x1020,d1
1062 beq ai_no_sb
1063
1064 bra return_to_main
1065
1066ai_no_sb:
1067 btst.l #4,d0 /* A - confirm */
1068 beq ai_no_input
1069 bset.l #7,d6
1070 move.w d7,d1 /* back to prev mode */
1071 and.w #0x3800,d1
1072 lsr.w #3,d1
1073 and.w #0xc0ff,d7
1074 or.w d1,d7
1075
1076ai_no_input:
1077 bra vbl_end
1078
1079
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
1090 menu_text txt_jmp_addr, 13, 13, 0
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
1094
1095 /* dtack safety on/off */
1096 movea.l #0xe000+26*2+15*64*2,a0
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
1112 and.b #7,d0
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
1125 and.b #7,d1
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
1132 move.b #4,d1
11330:
1134 cmp.b #4,d1
1135 ble 0f
1136 move.b #0,d1
11370:
1138 and.b #0xf8,d5
1139 or.b d1,d5
1140 bra vbl_end
1141
1142msm_no_ud:
1143 btst.l #4,d0 /* A - confirm */
1144 beq msm_no_a
1145 move.b d5,d1
1146 and.b #7,d1
1147 bne 0f
1148 change_mode MMODE_GOTO, MMODE_MAIN
1149 bsr start_menu_box
1150 bra vbl_end
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
1157 bra vbl_end
11580:
1159 cmp.b #2,d1
1160 bne 0f
1161 change_mode MMODE_JMP_ADDR, MMODE_MAIN
1162 bsr start_menu_box
1163 bra vbl_end
11640:
1165 cmp.b #3,d1
1166 bne 0f
1167 change_mode MMODE_DUMP, MMODE_MAIN
1168 bsr start_menu_box
1169 bra vbl_end
11700:
1171 cmp.b #4,d1
1172 bne 0f
1173 bchg.l #4,d6
1174 bra vbl_end
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:
1184 bra vbl_end
1185
1186start_menu_box:
1187 movea.l #0xe000+10*2+8*64*2,a1
1188 move.w #11-1,d1
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
1220 lea (predef_addrs,pc),a2
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:
1258 bra vbl_end
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
1266 lea (predef_addrs,pc),a0
1267 move.l (a0,d0),d5
1268 lsl.l #8,d5
1269 bra mode_goto_finish
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:
1278 bra vbl_end
1279
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
1290 bra vbl_end
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
1298################### transfer #####################
1299
1300mode_transfer:
1301 move.b #0x40,(0xa1000b).l
1302 move.b #0x40,(0xa10005).l
1303
1304 move.l (transfer_mode,pc),d0
1305 tst.l d0
1306 bne 0f
1307 lea (txt_ready_send,pc),a0
1308 bra 1f
13090:
1310 lea (txt_ready_recv,pc),a0
13111:
1312 move.l #13,d0
1313 move.l #13,d1
1314 move.l #0x8000,d2
1315 jsr print
1316
1317wait_tl_low0:
1318 move.b (0xa10005),d0
1319 btst.b #4,d0
1320 bne wait_tl_low0
1321
1322 menu_text txt_working, 13, 13, 0
1323
1324 lea 0xa10005,a1
1325 move.l (transfer_addr,pc),a0
1326 move.l (transfer_len,pc),d2
1327
1328 move.l (transfer_mode,pc),d0
1329 tst.l d0
1330 bne transfer_recv
1331
1332transfer_send:
1333 move.b #0x4f,(0xa1000b).l
1334
1335tr_send_loop:
1336 move.b (a0),d1
1337 and.b #0x0f,d1
1338
1339wait_tl_low1:
1340 move.b (a1),d0
1341 btst.b #4,d0
1342 bne wait_tl_low1
1343
1344 move.b d1,(a1) /* clears TH and writes data */
1345
1346 move.b (a0)+,d1
1347 lsr.b #4,d1
1348 bset.b #6,d1 /* prepare TH */
1349
1350wait_tl_hi1:
1351 move.b (a1),d0
1352 btst.b #4,d0
1353 beq wait_tl_hi1
1354
1355 move.b d1,(a1)
1356 subq.l #1,d2
1357 bne tr_send_loop
1358
1359 move.b #0,(0xa1000b).l
1360 bra return_to_main
1361
1362transfer_recv:
1363 move.b #0,(a1) /* clear TH */
1364
1365tr_recv_loop:
1366wait_tl_low2:
1367 move.b (a1),d0
1368 btst.b #4,d0
1369 bne wait_tl_low2
1370
1371 move.b #0x40,(a1) /* set TH */
1372 move.b d0,d1
1373 and.b #0x0f,d1
1374
1375wait_tl_hi2:
1376 move.b (a1),d0
1377 btst.b #4,d0
1378 beq wait_tl_hi2
1379
1380 move.b #0,(a1) /* clear TH */
1381 lsl.b #4,d0
1382 or.b d0,d1
1383 move.b d1,(a0)+
1384
1385 subq.l #1,d2
1386 bne tr_recv_loop
1387
1388 move.b #0,(0xa1000b).l
1389 bra return_to_main
1390
1391
1392# go back to main mode
1393return_to_main:
1394 bclr.l #7,d6 /* not edited */
1395 change_mode MMODE_MAIN, MMODE_MAIN
1396 write_vdp_r_dst 12,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320),(GFXCNTL)
1397 bra vbl_end
1398
1399
1400#################################################
1401# #
1402# Initialize VDP registers #
1403# #
1404#################################################
1405
1406init_gfx:
1407 move.l #GFXCNTL,a3
1408 write_vdp_reg 0,(VDP0_E_DISPLAY | VDP0_PLTT_FULL)
1409 write_vdp_reg 1,(VDP1_E_DISPLAY | VDP1_MODE5)
1410 write_vdp_reg 2,(0xe000 >> 10) /* Screen map a adress */
1411 write_vdp_reg 3,(0xe000 >> 10) /* Window address */
1412 write_vdp_reg 4,(0xc000 >> 13) /* Screen map b address */
1413 write_vdp_reg 5,(0xfc00 >> 9) /* Sprite address */
1414 write_vdp_reg 6,0
1415 write_vdp_reg 7,0 /* Backdrop color */
1416 write_vdp_reg 0x0a,1 /* Lines per hblank interrupt */
1417 write_vdp_reg 0x0b,0 /* 2-cell vertical scrolling */
1418 write_vdp_reg 0x0c,(VDP12_SCREEN_V224 | VDP12_SCREEN_H320)
1419 write_vdp_reg 0x0d,(0x8000 >> 10) /* Horizontal scroll address */
1420 write_vdp_reg 0x0e,0
1421 write_vdp_reg 0x0f,2
1422 write_vdp_reg 0x10,(VDP16_MAP_V32 | VDP16_MAP_H64) /* layer size */
1423 write_vdp_reg 0x11,0
1424 write_vdp_reg 0x12,0
1425 rts
1426
1427
1428# get mask of bits representing safe words
1429# a1 - address to check
1430# destroys d0-d2, strips upper bits from a1
1431get_safety_mask:
1432 move.l a1,d1
1433 lsl.l #8,d1
1434 lsr.l #8,d1
1435 lea (safe_addrs,pc),a1
1436 move.w #(safe_addrs_end - safe_addrs)/8-1,d2
14370:
1438 move.l (a1)+,d0
1439 cmp.l d0,d1
1440 blt 1f
1441 move.l (a1),d0
1442 cmp.l d0,d1
1443 ble addr_safe
14441:
1445 addq.l #4,a1
1446 dbra d2,0b
1447
1448 move.l d1,a1
1449
1450 moveq.l #0x0c,d0
1451 cmp.l #0xa14000,d1
1452 beq gsm_rts
1453
1454 moveq.l #0x08,d0
1455 cmp.l #0xa14100,d1
1456 beq gsm_rts
1457
1458 /* check for VDP address */
1459 move.l d1,d0
1460 swap d0
1461 and.b #0xe0,d0
1462 cmp.b #0xc0,d0
1463 bne addr_unsafe /* not vdp */
1464
1465 move.l d1,d0
1466 and.l #0x0700e0,d0
1467 bne addr_unsafe
1468
1469 move.l d1,d0
1470 and.b #0x1f,d0
1471 cmp.b #0x04,d0
1472 blt addr_hsafe_3 /* data port */
1473 cmp.b #0x10,d0
1474 blt addr_safe /* below PSG */
1475 cmp.b #0x18,d0
1476 bge addr_safe /* above PSG */
1477
1478addr_unsafe:
1479 moveq.l #0,d0 /* skip line */
1480 rts
1481
1482addr_hsafe_3:
1483 moveq.l #3,d0 /* skip 2 words */
1484 rts
1485
1486addr_safe:
1487 move.l d1,a1
1488 moveq.l #0xf,d0
1489gsm_rts:
1490 rts
1491
1492
1493# read single phase from controller
1494# #a0 - addr
1495# d0 - result
1496# destroys d1,d2
1497get_input:
1498 move.b #0x40,(0xa10003)
1499 nop
1500 nop
1501 nop
1502 move.b (0xa10003),d0
1503 move.b #0x00,(0xa10003)
1504 lsl.w #8,d0
1505 nop
1506 move.b (0xa10003),d0
1507 eor.w #0xffff,d0
1508
1509 swap d7
1510 move.w d7,d1
1511 eor.w d0,d1 /* changed btns */
1512 move.w d0,d7 /* old val */
1513 swap d7
1514 and.w d0,d1 /* what changed now */
1515 bne 0f
1516
1517 addq.b #1,d6
1518 move.b d6,d2
1519 and.b #0x0f,d2 /* do autorepeat */
1520 cmp.b #9,d2
1521 bne 1f
1522 move.w d0,d1
15230:
1524 and.b #0xf0,d6
15251:
1526 swap d0
1527 move.w d1,d0
1528 rts
1529
1530# Prepare to write to VDP RAM @a0
1531# sets a0 to VDP data port for convenience
1532# a0: VRAM base
1533# destroys d0
1534
1535load_prepare:
1536 VRAM_ADDR_var a0
1537 move.l d0,(GFXCNTL).l
1538 move.l #GFXDATA,a0
1539 rts
1540
1541
1542# Load color data from ROM
1543# a0: CRAM base
1544# a1: color list address
1545# d0: number of colors to load
1546# destroys d1
1547
1548load_colors:
1549 move.l d0,d1
1550 CRAM_ADDR_var a0
1551 move.l d0,(GFXCNTL).l
1552
1553 move.l #GFXDATA,a0
1554 subq.w #1,d1
15550:
1556 move.w (a1)+,(a0)
1557 dbra d1,0b
1558
1559 rts
1560
1561
1562# print
1563# a0 - string
1564# d0 - x
1565# d1 - y
1566# d2 - tile_bits[15:11]
1567# destroys a1
1568
1569print:
1570 move.l a0,a1
1571 XY2NT
1572 jsr load_prepare
1573 move.l d2,d0
1574 and.w #0xf800,d0
1575
1576_print_loop:
1577 move.b (a1)+,d0
1578 beq _print_end
1579
1580 move.w d0,(a0)
1581 bra _print_loop
1582
1583_print_end:
1584 rts
1585
1586
1587# print_hex
1588# d0 - x
1589# d1 - y
1590# d2 - value
1591# d3 - tile_bits[15:11]|digit_cnt[7:0]
1592# destroys a0, preserves d3
1593
1594print_hex:
1595 XY2NT
1596 jsr load_prepare
1597
1598print_hex_preped:
1599 moveq.l #0,d0
1600 move.b d3,d0
1601 move.l d0,d1
1602 lsl.b #2,d0
1603 ror.l d0,d2 /* prep value */
1604 subq.l #1,d1 /* count */
1605 move.w d3,d0
1606 and.w #0xf800,d0 /* keep upper bits in d0 */
1607
1608_print_hex_loop:
1609 rol.l #4,d2
1610 move.b d2,d0
1611 and.b #0xf,d0
1612
1613 add.b #'0',d0
1614 cmp.b #'9',d0
1615 ble 0f
1616 addq.b #7,d0
16170:
1618 move.w d0,(a0)
1619 dbra d1,_print_hex_loop
1620
1621 rts
1622
1623
1624# wait vertical sync interrupt
1625
1626wait_vsync:
1627 move.b d7,d0
1628_wait_change:
1629 stop #0x2000
1630 cmp.b d7,d0
1631 beq _wait_change
1632 rts
1633
1634
1635# wait vsync start (polling)
1636# destroys a0,d0
1637
1638wait_vsync_poll:
1639 move.l #GFXCNTL,a0
16400:
1641 move.w (a0),d0
1642 and.b #8,d0
1643 nop
1644 nop
1645 bne 0b
16460:
1647 move.w (a0),d0
1648 and.b #8,d0
1649 nop
1650 nop
1651 beq 0b
1652 rts
1653
1654
1655test_code:
1656 move.w #3, (0xa15100) /* adapter enable, reset off */
1657 nop
1658 nop
1659 move.w #1, (0xa15180) /* mode 1 */
1660 movea.l #0xa15200, a0
1661 move.l #256-1, d0
16620:
1663 move.w #0,(a0)+
1664 dbra d0,0b
1665 move.w #0x83e0, (0xa15200) /* color 0 */
1666
1667test_code_ret_op:
1668 jmp 0x123456 /* will be patched */
1669test_code_end:
1670
1671#################################################
1672# #
1673# RAM DATA #
1674# #
1675#################################################
1676
1677.bss
1678
1679# nothing :)
1680
1681.end
1682
1683# vim:filetype=asmM68k
Genesis/MegaDrive related projects