25 Jan
2012
25 Jan
'12
9:19 p.m.
Model III's and 4s are selling from between $400
and $2400 on eBay. These=
How mauch are M4's going for then?
I used an M3 for several years until I got an M4 (older version CPU board
without the large gate array chips -- the only custom part is the video
timing chain [1]). I've not found anything the M3 could do that I can't
also do on the M4, and the 80 column display and ability to run CP/M cabn
be useful.
[1] This is not a 6845, for all it has much the same pinout. It's a
mask-programemd thing, you don't write to all the configuations
registers, that's what the mask programming defines. The pin that would
be the light pen siganl on a 6845 selects between 2 possible
configurations (here used for 64 colun or 80 column modes).
-tony