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There's a Lisa teardown over at EEVblog -> http://www.youtube.com/watch?v=_hxdz6c8bHg

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I had no idea a Lisa was a handheld game running on a 4-bit microcontroller ;-) No wonder the driver's all wrong!

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Originally Posted By R. Belmont
I had no idea a Lisa was a handheld game running on a 4-bit microcontroller ;-) No wonder the driver's all wrong!


What is the current setup people are using to dump COP 420's?
I was going to try dumping all the HP-HIL chips. The last one I
did was for Looping back in the 90's. I think I still have the code for talking to a PCI parallel port card that I used.

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I don't actually know, I remember the Lisa COP 420s being dumped at least 2-3 years ago now but I don't remember who did it.

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IIRC it was done as a decap and segher figured out the bit order, but there's actually a way to dump cop420s without decap at all, electrically, explained on a natsemi application note.

LN


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Originally Posted By Lord Nightmare
IIRC it was done as a decap and segher figured out the bit order, but there's actually a way to dump cop420s without decap at all, electrically, explained on a natsemi application note.

LN


yes, that's what I used when I dumped the one on Looping.
I never really followed up if the information got used or was correct.

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Anyone know the appnote #? I looked through a bunch on bitsavers but didn't come across it. Thanks!

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"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
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Very handy- thanks! It looks very similar to the 3870.

The TI57 patent mentions a test pin, and describes how to dump the TMS1500 ROM. It looks much simpler than the TMS1000/1100! HrastProgrammer mentioned that a friend of his was able to dump the ROM, so I guess there is enough info in the patent. I'll probably still decap one, even though the instruction PLA is likely stock (since his emulator runs the ROM dump) and the output PLA would be easy to figure out.

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