Re: PLA equations

From: Ethan Dicks (
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.


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