Comments for page: 1702A EPROM Programmer

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Posted by Va3qe May 02, 2017 - 08:12 am
Did you do the schematics in Eagle? If so can you post the eagle files?

Posted by Steve L. August 30, 2014 - 02:46 pm
Hi Minime, I take it that you meant to say "reader part" at the end of your message. Yes indeed, to extract the reader part, look at the sections enclosed in dotted lines at the lower left of the schematic. (Unfortunately for clarity, the DB25 connectors are also drawn with dotted lines but please ignore those for the moment.) The dotted lines I mean are labeled "Optional Reader" and "Optional Reader Pwr Ctrl." To make a reader, you need what is contained in those two sections, along with the DB25F connector directly above. Then make the separate adapter cable shown on the left. The adapter cable goes from the reader board to the two parallel ports needed on your PC. Beware that many newer PCs don't have parallel ports.

Only the +5V and -9V power supplies shown in the dotted lines are needed for the reader. If you are careful to keep those supplies off when inserting and removing the 1702A, you could leave out the "Optional Reader Pwr Ctrl" section. In that case, about the only things left on the reader board would be the 1702A socket, a couple caps and the DB25F connector. No active electronics needed!

I don't know of any reason why the existing software wouldn't work with this arrangement. Of course, the only useable command will be (R)ead. Choosing that will prompt you for a filename and a choice of ASCII or binary format. It will then read the PROM data and put it in the file.

I wish you the best of luck with your project.

Posted by minime August 30, 2014 - 01:02 pm
This is by far the best writer description I could find so far... unfortunately for me I am searching for a reader only, to keep things simple, but most on the net is either incomprehensible or includes a writer. Would it be hard to extract from the schematics only the writer part?

Posted by Steve L. August 28, 2013 - 06:32 am
Hi Mike, I'm not familiar with the M5203Q part and could not find a datasheet on it. Sometimes, board manufacturers use "house numbers" on parts, instead of the standard commercial ones. It's possible that that is what this number is. I'm sorry that I cannot help further with your question.

Posted by Mike August 27, 2013 - 09:35 pm
I need some help programming a few M5203Q eproms. Im not electronically inclined. Will this copy / program this eprom?
Thanks

Posted by Steve L. October 27, 2012 - 12:47 pm
Hi Paul, I appreciate the kind words. It's neat that you built the PE programmer and Z80 computer. I had a somewhat similar experience around 1976, building an 8080-based computer. I was lucky though, that the company where I worked had an Intel development system (in another building). Used that to burn the 1702A-based debugger for my 8080. Used every byte!


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