Apple II Gameport EPROM Programmer

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Apple II Gameport EPROM Programmer

I saw this page which has a description for an eprom programmer:

https://www.applefritter.com/appleii-box/H049_AppleIIepromProgrammer.htm

Is there a ready made layout file I can use to order a PCB?

And is there a proper BOM list somewhere, which makes it easier to order the correct components?

 

 

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You could have ordered a pcb

You could have ordered a pcb in 1984 from Franzis-Verlag in Muenchen, West-Germany. This project was introduced in the mc 8/1984.

 

But times were changing :-)  With the mc 1/1987  the author Peter Seng introduced version 2. The new one can programm 27512, has  current control during programming, an internal power supply, and a disconnected pin 28 (Vcc) when inserting or taking out the EPROM. There is the article about version 2 including one side of the layout:

http://www.ralf-kiefer.de/A2/mc-Eprommer/mc_Eprommer_V2a.pdf

 

This is version 2 "upgraded" to modern chinese DC-DC-converters instead of the large 50Hz transformator:

http://www.ralf-kiefer.de/A2/mc-Eprommer/mcV2_mit_DCDC_klein.jpg

 

Regards

Ralf

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RalfK wrote:You could have
RalfK wrote:

You could have ordered a pcb in 1984 from Franzis-Verlag in Muenchen, West-Germany. This project was introduced in the mc 8/1984.

 

I don't think I could have :-)

I got my Apple II europlus in 1983 or 1984 as a young guy and was not aware of these eprom programmer things back then.

 

Thanks for the pdf and jpg.

I have downloaded them and will look at it and decide if I will begin the task of making it.

 

Do you have a link for that DC-DC-converter on ebay or somewhere else?

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My power supply

My observation: the 50Hz transformator from the 1980s was (of course) a 220V type. In these times I often got just 215V where I lived as a student but that was in tolerance. Now in West-Germany the voltage is regulated to 230V. Actually I live in a short distance to the transformator station, means I typically see incoming 235V. That's also in tolerance. Now. But this difference of 20V is a bit stressy for the LM317 and especially the 7806.

 

My decision: an external power supply between 7 and 24V. The seperation of the 5V branch from the 7806 means I removed D4. One DC-DC converter is a fixed 5V type (stepdown) having exact 5,0V at the programming socket. The other is a stepup converter to power the "high voltage rail" with 30V.

 

These DC-DC converters are types which were available in my "storage".

 

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