28 Aug
2011
28 Aug
'11
5:24 p.m.
On 28 Aug 2011 at 19:23, Tony Duell wrote:
I don;t have the schematics, but my first guss,
unfortunately, would
be a combinatorial PAL acting as a decoder for some of the address
lines (and manybe other signals).
I hope you're wrong.
This is a strange 6300. The keyboard controller's been replaced with
a "piggyback" PCB with a TMS7000 microcontroller and an EPROM and
some glue. There's a small card that plugs into one of the secondary
(short green) slot connectors on the bus converter board that has
nothing but an 4Kbit 82S147 PROM on it. I don't know the reason for
either of those and can't find any documentation on them.
--Chuck