6 May
1998
6 May
'98
4:10 a.m.
On Tue, 5 May 1998, Sam Ismail wrote:
When I got home I opened it up along with a regular
production //c and
started comparing the motherboards of the two. There were several minor
differences. Some silkscreen lettering was different and there were a
couple minor component changes, but nothing significant and for the most
part the board layout was identical.
The IIc prototype that I have must be a later revision, since it has a
mask-programmed character ROM (that is marked as a prototype) instead of
the EPROM that is in your machine. It has been a while since I've had it
apart, but I seem to remember seeing several other (non-ROM) ICs that were
labeled as prototypes, as well. I'll open it up again and take a look.
If anyone is interested, there is a fuzzy picture of this machine on my
(currently content-poor) collection web site, at
http://xtal.pharm.nwu.edu/~ware/collection/machines/a2cproto.html
--
Scott Ware ware(a)xtal.pharm.nwu.edu