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AJR Hacker
MAME Developer
Reged: 02/01/16
Posts: 144
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Re: [LASERDISC] What CPU is this? what machine language instruction set does it use?
07/03/19 02:17 PM
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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.






Entire thread
Subject Posted by Posted on
* [LASERDISC] What CPU is this? what machine language instruction set does it use? Matt Ownby 07/03/19 06:13 AM
. * Re: [LASERDISC] What CPU is this? what machine language instruction set does it use? Rygar9  07/04/19 07:43 AM
. * Re: [LASERDISC] What CPU is this? what machine language instruction set does it use? italiandoh  07/03/19 11:37 PM
. * Re: [LASERDISC] What CPU is this? what machine language instruction set does it use? ClawGrip  07/04/19 01:40 PM
. * Re: [LASERDISC] What CPU is this? what machine language instruction set does it use? Haze  07/04/19 10:28 PM
. * Re: [LASERDISC] What CPU is this? what machine language instruction set does it use? Vas Crabb  07/03/19 10:53 AM
. * Re: [LASERDISC] What CPU is this? what machine language instruction set does it use? AJR Hacker  07/03/19 02:17 PM
. * Re: [LASERDISC] What CPU is this? what machine language instruction set does it use? Matt Ownby  07/03/19 06:55 PM

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