12 Dec
2006
12 Dec
'06
2:47 p.m.
In article <m1GuER6-000IytC at p850ug1>,
ard at p850ug1.demon.co.uk (Tony Duell) writes:
OK, a roigh description of what's on the various boards.
The I/O board contains anm 80188 with 512K DRAM (4 off 44256s) and a pair
of 27C512 (64K byte) EPROMS. One is labelled COMM, the other TCP (hmm...
;-)) Ther's the 8042 microcontrolelr I mentioned which handles the PC/AT
keyboard interface, along with the handshake lines for a centronics
printer port and an interface to an E2PROM that holds the configuration.
Sireail I/O uses a thing called a 2692, which seems to be a dual serial
chip, for the mouse and host RS232 interfaces. Etehrnet uses the standard
8390 + 8391 chips, with am 8392 thinwire tranceiver on the same board
(there are jumpers to select between that and the DA15 AUI port).
One milidly odd thing is that there's no DC-DC converter for the ethernet
transceiver. Insttair, the PSU has an isolated 9V output to run it. I
don;t think there's anything more to say abotu the PSU.
The video board hs the 34010 on it (of course), a copuple of 27512 EPROMS
(presuambly boot code for the video processor), 2M of DRAM (16 off
44256s) and 1M of VRAM (8 off 24256s). Oh, and a RAMDAC
The EPROM daugetboard has 7 pairs of 27256s on it (so a total of 14 *
64K of EPROM).
-tony
I should have scheamtics somewhere so I can find
more details if you're
interested.
Yes, that would be interesting! To me, anyway :).