Am 28.12.2010 16:19 schrieb Steven Hirsch:
Unfortunately, there is little theory-of-operation data available. The PAL equations were not available initially. I bugged Chuck and was able to get some files, but he was unsure whether they were the actual production code.
There are files available at http://www.prodev.biz/DDT/ddt.htm -- are these the ones you got?
The 74S287 are 256x4 bit proms. With an adapter, you can put them into a 2716 socket and dump the data.
A PAL16L8 has a security fuse that prevents reading the fusemap. However, this is a fully combinatorical device, without internal memory. Assuming you know which pin is input and which is output, you can wire an adapter to an EPROM socket and dump the state table.
Patrick