Message: 5 Date: Mon, 22 Feb 2021 21:45:24 -0600 From: Jon Elson <[email protected]> To: Brad H <[email protected]>, [email protected], [email protected]:On-Topic and Off-Topic Posts <[email protected]> Subject: Re: MSI 6800 EPROM Software Message-ID: <[email protected]> Content-Type: text/plain; charset=UTF-8; format=flowed
On 02/22/2021 01:31 PM, Brad H via cctalk wrote: > Hi there, > > A longshot I'm sure - but I am wondering if anyone familiar with MSI (Midwest Scentific - SS50 bus system) would happen to have a copy of the software for their 1702A EPROM burner, I think the model is PR-1. I just picked one up and am eager to see if I can use it to read/burn 1702As, something that has been an issue for me for a while now. > > Reading them is pretty easy. BURNING them is crazy. They need an 80 V power supply, and I think you XOR the address or something as you apply the programming voltage. Jon Actually, programming a 1702 only requires a -48 volt pulse for each address. Here's the datasheet: https://www.jmargolin.com/patents/1702a.pdf
