MAMEWorld Forums - Programming - Re: MAME debugger vs. IDA Pro

> IDA Pro does not disassemble automatically; you must click on the starting address to
> disassemble and press C.

This trick covers adresses till 200A only.

> The semicolon means you or someone using your computer commented that line
> previously.

I looked inside MAME Debugger internal disassembler sources recently - and made sure that semicolon really means an auto-comment:

Code:

case 0x3a:
{
/* program counter with displacement */
			u16 temp_value = read_imm_16();
			return util::string_format("(%s,PC) ; ($%x)", make_signed_hex_str_16(temp_value), (make_int_16(temp_value) + m_cpu_pc-2) & 0xffffffff);
}

And now, here is a code executing after first joypad interaction string I found in KoF '94 disassembly (main1.asm file). Well, please check, did I understood all in the commented strings correctly.

Code:

0330B8: 1039 0010 FD96           move.b  $10fd96.l, D0	;P1_CURRENT value moving to D0
0330BE: 0240 000F                andi.w  #$f, D0	;D0 first 4 bits (active joystick directions) check
0330C2: D040                     add.w   D0, D0	;why this D0 self-doubling is need, prompt me please!
0330C4: 41FA 002C                lea     ($2c,PC) ; ($330f2), A0
0330C8: 4E71                     nop
0330CA: 3230 0000                move.w  (A0,D0.w), D1
0330CE: 6B20                     bmi     $330f0	;end of suroutine if result of A0+D0 moving to D1 is negative
0330D0: 203C 0002 0000           move.l  #$20000, D0
0330D6: 4EB9 0000 27EC           jsr     $27ec.l	;jump to $27ec subroutine (this subroutine code will be quoted separately)
0330DC: 2944 0050                move.l  D4, ($50,A4)
0330E0: 2945 0058                move.l  D5, ($58,A4)
0330E4: 4844                     swap    D4
0330E6: 4845                     swap    D5
0330E8: D96C 0024                add.w   D4, ($24,A4)
0330EC: DB6C 0026                add.w   D5, ($26,A4)
0330F0: 4E75                     rts

Code:

0027EC: 2800                     move.l  D0, D4
0027EE: 3A01                     move.w  D1, D5
0027F0: 6100 0010                bsr     $2802
0027F4: C144                     exg     D0, D4
0027F6: 1205                     move.b  D5, D1
0027F8: 6100 000C                bsr     $2806
0027FC: C145                     exg     D0, D5
0027FE: 4485                     neg.l   D5
002800: 4E75                     rts

Code:

002802: 0601 0040                addi.b  #$40, D1
002806: 0281 0000 00FF           andi.l  #$ff, D1
00280C: 4A01                     tst.b   D1
00280E: 6A02                     bpl     $2812
002810: 4480                     neg.l   D0
002812: D241                     add.w   D1, D1
002814: 41F9 00C0 4000           lea     $c04000.l, A0
00281A: 3230 1000                move.w  (A0,D1.w), D1
00281E: 0C41 0001                cmpi.w  #$1, D1
002822: 6704                     beq     $2828
002824: 6000 0004                bra     $282a
002828: 4E75                     rts

Code:

00282A: 4A80                     tst.l   D0
00282C: 40C3                     move    SR, D3
00282E: 6722                     beq     $2852
002830: 6A02                     bpl     $2834
002832: 4480                     neg.l   D0
002834: 3400                     move.w  D0, D2
002836: 4840                     swap    D0
002838: C4C1                     mulu.w  D1, D2
00283A: 0682 0000 8000           addi.l  #$8000, D2
002840: 4242                     clr.w   D2
002842: 4842                     swap    D2
002844: C0C1                     mulu.w  D1, D0
002846: D082                     add.l   D2, D0
002848: 44C3                     move    D3, CCR
00284A: 6A02                     bpl     $284e
00284C: 4480                     neg.l   D0
00284E: 4E75                     rts

Edited by VasiliyFamiliya (02/27/19 05:07 AM)