From: Ethan Dicks (erd_at_infinet.com)
Date: 2003-06-10 00:30:05
> Since some of the early C64's used the 82s100 instead of the MOS
> 906114 can't this GAL/adapter fix work on most c64 boards (rev A-C)?
The 82S100 is shipped as an unprogrammed programmable chip. The
906114 is manufactured to be the same as an 82S100 programmed for
an early-rev C-64. The "906114" is just the Commodore part number
for a masked-programmed PLA for those boards.
Not that it's easy to find a blank 82S100 these days (nor a programmer
that can blast one), with the logic equations on funet, it's possible
to program the real thing, once you find the parts.
As to the specific question, I can't comment on a GAL adapter, but
in general, PLAs are more like ROMs than GALs... they are different
internally and solve different design problems. It may be possible
to convert a specific PLA map to a set of GAL equations, but only
on a case-by-case basis. There's no general solution.
-ethan
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