🚀 go-pugleaf

I note that someone here asked about sources for the
PAL chip for upgrading Multipaks.

The OLD, BIG multipak (cat no. 26-3024, in EITHER gray or white case)
does need to have its original PAL chip replaced for compatibility
with the different addressing in the CoCo 3.

However, note that a "PAL" chip (or a "GAL" chip, to use the name
for the more recent and flexible version of the same idea)
is a PROGRAMMABLE chip.   One BURNS a given FUSE MAP into them.
So unless you own a PAL programmer (prices start at $250, and decent
ones start at $800) AND have a fuse map for burning the correct data
knowing what PAL to buy is useless.   PAL programming is much different
from EPROM programming, and more complex, so a dedicated EPROM programer
CANNOT be modified to program a PAL or GAL.

I have posted on Delphi in the Hardware Hacking section fusemaps
that I personally worked out to burn upgrade PALs or GALs for
the old style Multipaks.  I posted two different fuse maps...
one for the ancient and obsolete 14L4 PAL chips, and one for
the modern, common, widely available 16V8 GAL chips.  Anyone
who has a PAL / GAL programmer, a source of PALs or GALs,
and knows what they are doing, can download the JDEC compatible
fusemaps I posed and use them.

If you like, I will gladly sell you a 16V8 GAL programmed correctly
for the Mpak upgrade.  My price is $12 for the chip, shipping included.
Send your check, and a note explaining what the check is for,
to me, Marty Goodman, 1633 Bayo Vista Ave, San Pablo, CA 94806.

   ---marty