-----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 All: 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? Thanks. Rich Rich Cini Collector of classic computers Build Master for the Altair32 Emulation Project Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/ /************************************************************/