3 Jul
1998
3 Jul
'98
5:20 p.m.
Hi all,
At 07:35 PM 7/3/98 +0100, Tony Duell wrote:
...
Did the early IBM mono boards have a character generator, like in serial
terminals? I thought I had one, but it is a clone, still with a 6845 and 64k
dynamic ram, 8 ic's. There is a 6116 2k byte ram on it, in a socket, which I
assume is loaded from the BIOS with the character data. See no ROM. Newer
boards with (almost) a single ASIC chip, I have no idea what they do.
-Dave
The IBM Mono
Emulator board is labeled "P C Emulator" and "WANG
9443-R2-M2" and has two 28-pin EPROMs on it labeled "HN482764G-2". There
8K*8 EPROMS.
are five 28-pin chips from Toshiba labeled
"TC5565PC-15". There is also a
RAM, I think. Possibly video RAM.
40-pin chip labeled
"HD46505SP/HD6845SP". The rest is TTL.
6845 CRT controller (basically the timing chain for the video section).
Is there another 24 pin chip (EPROM or ROM) on this board as a character
generator? I would have expected one. Unless one of the 5565s is used for
that and loaded from disk or something.