Identifying parts on a VT100 logic board

From: Paul Williams <flo_at_rdel.co.uk>
Date: Sat Mar 10 06:41:31 2001

I've just received some VT100 boards and I have several questions.

I have a VT125 case containing monitor and PSU, but with an empty card
cage. Can I just plug in a board and fire it up? (Assuming that the PSU
is OK, since I wouldn't know how to load it in order to test it.)

There are four socketed chips together, labelled E40, E45, E52 and E56.
Does anyone have the schematics and know what these contain? Three of
these (E40, E52 and E56) contain AM9218 2Kx8 ROMs, but I can't find a
pinout of this. Is there a pin-compatible EPROM (2716?) that I could set
my PROM programmer to, in order to upload these?

The fourth chip, E45, is labelled differently on the two boards

Board 1. Signetics K8340 / CN7295N / 23-033E2-00 / (c) DEC 1978
Board 2. [logo S] 8015E / C48008 / 23033E2

I assume that 23033E2 is DEC's part number, but I can't find references
for either 8340 or 8015. Is this another ROM?

Paul
Received on Sat Mar 10 2001 - 06:41:31 GMT