Tall Tree Systems`JRAM-3'

From: Fred Cisin <cisin_at_xenosoft.com>
Date: Sun Dec 2 14:31:23 2001

On Sun, 2 Dec 2001, Robert Schaefer wrote:
> Well, I made a few mistakes. I think it's a PC, not a PC/XT. Five 8 bit
> slots, a DIN tape port on the back, fully populated with 4 banks of 9 4564.
> It is a MCA video card, the `black and white/parallel' was a dead giveaway.
          ^^^
CAREFUL! That would be an MDA (Monochrome Display Adapter), or more
accurately MDP (Monochrome Display & Printer). MCA is MicroChannel
Architecture (as used in PS/2), which it most definitely is NOT.
picky, picky, ...

> That's a lot bigger than I expected! The board has only 74 series logic on
> it, apart from the ram, so I guess all support for the ports on it are
> contained on the daughtercard. A closer look indicates that all the readily
> visible traces coming from the ports end up on the single-row header.

RIGHT

> > If those chips are not on the board, then maybe the external connectors
> > just link to the row of sockets on the PCB near them, and you need the
> > daughterboard for any I/O functions.
> Yup, that's my current guess too.
RIGHT
Received on Sun Dec 02 2001 - 14:31:23 GMT