Hey all,
I am currently in the process of dumping all of my arcade laserdiscs using the Domesday Duplicator and a calibrated LD-V4300D (thanks to Simon Inns!). Results are very good so far but one problem is dumping Dragon's Lair 2 which has stop codes. The laserdisc player, by default, will pause the disc when encountering the stop codes which isn't going to work.
So I thought it wouldn't be too hard (ha ha ha!!) to just modify the EPROM and disable the part that pauses on stop codes.
I got the ROM dumped (it's a standard 27C256), but when it came time to identify the CPU, it appears to be a possibly proprietary CPU from Pioneer labeled 'PD0081B1'. I am kinda blocked at this point. Does anyone know anyone about this IC? I am hoping that it uses another CPU's instruction set. I saw some address vectors at the end of the ROM that look like what the 6502 and 6809 do.
I am not totally sure that this is the CPU, but from looking at the schematics, it is the most likely candidate since it has both address and data lines.
https://photos.app.goo.gl/fxsuctvrSnkz7b9C7
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[LASERDISC] What CPU is this? what machine language instruction set does it use?
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