21MX proms (per request

Anyone interested in doing 1702As should look at the schematic in the MCS4 user manual on bitsavers.org There is a schematic for a MP7-03 board. It can be easily controlled can easily be replaced by software. You mainly need the level converters. Dwight From: dkelvey at hotmail.com To: cctalk at classiccmp.org Subject: RE: 21MX proms (per request Date: Thu, 10 Sep 2015 07:03:53 -0700 I would be surprised if it did 1702s and 2708s. Even 2716s have a slightly different hardware configuration. 1702s require voltages like 50 volts ( I could be a little off ) and changing address and data lines over wide voltage ranges. 2708s require multiple rail voltages as well as programming voltages. 2716 are that last of the program by turning the programming voltage on and off. All the newer chips have a constant programming voltage and a separate program logic level pin. They can even be read while the programming voltage is high. I doubt any would make the special provisions for 1702s. 2708s are a stretch but if your not doing 2716s it won't be able to handle 2708 even if it had the extra rail voltages. I have a DataIO ( I think a 29B ) and I know it doesn't do 1702s. In any case, I don't think any of these would be fast enough for a 21MX boot code. I think these expect it to be faster than 100ns. Dwight