Zilog Z80-MCB

From: Pete Turnbull <pete_at_dunnington.u-net.com>
Date: Wed Sep 29 18:42:21 1999

While rooting around in some Z80 stuff today, I found a couple of Zilog
boards, a little less than 8" square, with 62-pin edge connectors. One
 (the silk-screen says Z80-MCB) is obviously a processor+RAM+ROM+I/O board,
and the other (the silk-screen says MDC2) some kind of RAM board. I'm
looking for any other useful information. Here's what's on them:

Z80-MCB: Z80, Z80-PIO, Z80-STC, AM9551, 4 empty 24-pin (ROM?) sockets, 8 x
446, a couple of small (MMI 6306) PROMs, assorted TTL, 4-way DIP switch, a
16-pin and an 8-pin socket with jumper blocks labelled "VDU", a pair of
16-pin sockets with unlabelled jumper blocks, 19.6608MHz crystal. In the
top right corner there's a single-inline 7-way socket (looks like half of a
14-pin DIL socket). Two positions, J6 (8-pin) and J2 (16-pin) are empty.

The MDC2 board has a Z80-PIO, 3 banks of 8 x 4116, what appear to be a
couple of bipolar PROMs (one label is illegible, the other says
"33-0053-16"), and assorted TTL.

Both boards have a round red device that could be a voltage regulator on

Any information gratefully received!

Pete						Peter Turnbull
						Dept. of Computer Science
						University of York
Received on Wed Sep 29 1999 - 18:42:21 BST

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