16 Dec
2007
16 Dec
'07
7:42 p.m.
the 1861 is a different can of worms
but Bob solved that with a tiny board that emulates it
It's true - the STG1861 uses two 74HC chips and two 22V10 GALs to make an
exact (AFAIK :-) emulation of the CDP1861, but I've run out of the PC boards
for it and there's just not enough demand to order more. The schematics and
GAL files are still there, though, if you want to make one on a piece of
perf board.
There was some guy who bought dozens of CDP1861 chips a while ago, and he
was selling them on the Yahoo COSMAC Elf group. You might check the
archives there, too.
Bob