Problems using VG PROM/RAM in 8800b
csmuseum at cse.uta.edu
Fri Jul 1 23:12:50 CDT 2005
I have two 8800b's and a smattering of S-100 boards. Let me know if you
don't get any feedback & we will see if we can work something out. For some
reason we have a pile of S-100 machines. We are in Arlington, TX if you or
any others are in the neighborhood, please drop by.
A. G. (Gil) Carrick, Director
The Museum at CSE
Coach - ICPC Programming Team
University of Texas at Arlington
Department of Computer Science & Engineering
Box 19015, 471 S Cooper Street
Arlington, TX 76019
> -----Original Message-----
> From: cctech-bounces at classiccmp.org
> [mailto:cctech-bounces at classiccmp.org] On Behalf Of Richard A. Cini
> Sent: Friday, July 01, 2005 2:37 PM
> To: CCTalk
> Subject: Problems using VG PROM/RAM in 8800b
> I want to get the Turnkey Monitor running on my 8800b.
> I have a VG PROM/RAM board (which has 1k of RAM and an EPROM
> programmer) and some 2716 EPROMS. I made an adapter so I can
> use 2716 chips in the 2708 sockets. So far, so good.
> I configured the board for $C000, no RAM and all other
> jumpers per the default for the board with the following exceptions:
> (1) "Use PRESET or POC for power-on/reset jump" The
> defaultis for the POC signal to be connected to the reset
> circuitry on the VG PROM board.
> The other jumper option is to connect PRESET to the reset
> circuit on the VG PROM board. This is now set for the PRESET
> line to be connected to the board's POR circuit. I don't have
> a schematic so I don't know what this is doing exactly.
> (2) "Phantom generated if power-on/reset" This disables
> other memory boards on reset so it can respond to the CPU
> reset jump to location 0 (making the board an auto-start
> board). I cut this jumper.
> (3) "Jump to PROM/RAM board if power-on/reset" This
> causes the board to respond to the CPU jump to location 0 on
> RESET. I set this jumper to the equivalent of disable.
> With this configuration, I can't EXAMINE or DEPOSIT
> to/from any location. When I remove the board, the Altair
> responds normally, so it definitely is this board.
> Does anyone have any experience using this board in an
> Altair (or other non-Vector) system? What's a working
> configuration for this? Does anyone have a spare generic ROM
> board I can buy/trade for?
> Rich Cini
> Collector of classic computers
> Build Master for the Altair32 Emulation Project Web site:
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