> Pinouts appear to match several members of the Mitsubishi MELPS 740 series, which
> runs a variation of the 6502 instruction set. MAME already has some support for the
> MELPS 740.
>
> The "CONT" board schematics actually show two of these, labeled "MECHA CONTROL" and
> "MODE CONTROL." The CNVss pin appears to pulled up for the former, making it execute
> from the 27C256, and pulled down for the latter, which must execute from internal ROM
> instead.
Good call. I initially thought this was x86 machine language, but I tried disassembling it as if it was MELPS 740 and got something that looked pretty sane:
Code:
ROM:B1DF RESET:
ROM:B1DF sei
ROM:B1E0 clt
ROM:B1E1 cld
ROM:B1E2 clc
ROM:B1E3 clv
ROM:B1E4 clb 4, $FF
ROM:B1E6 ldx #$BF
ROM:B1E8 txs
ROM:B1E9 ldm #$FF, $E8
ROM:B1EC ldm #$20, $E9 ; ' '
ROM:B1EF ldm #$FF, $EA
ROM:B1F2 ldm #$28, $EB ; '('
ROM:B1F5 ldm #$FF, $EE
ROM:B1F8 ldm #3, $ED
ROM:B1FB lda #$C7
ROM:B1FD sta $4000
ROM:B200 lda #$FE
ROM:B202 sta $4001
ROM:B205 lda #$ED
ROM:B207 sta $4002
ROM:B20A lda #$AF
ROM:B20C sta $4003
ROM:B20F lda #$FA
ROM:B211 sta $4004
ROM:B214 lda #$50 ; 'P'
ROM:B216 sta $4006
ROM:B219 lda #0
ROM:B21B sta $4007
ROM:B21E lda #$7F
ROM:B220 sta $6000
ROM:B223 lda #$FF
ROM:B225 sta $6001
ROM:B228 lda #$FF
ROM:B22A sta $6002
ROM:B22D lda #$7F
ROM:B22F sta $6003
ROM:B232 lda #$FF
ROM:B234 sta $6004
ROM:B237 lda #$64 ; 'd'
ROM:B239 sta $6006
ROM:B23C lda #0
ROM:B23E sta $6007
ROM:B241 lda #0
ROM:B243 tax
|
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Re: [LASERDISC] What CPU is this? what machine language instruction set does it use?
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