AtariGeezer, on Thu Jun 7, 2012 6:08 PM, said:
With the 4 horizontal diodes that make up a bridge rectifier, this uses an A.C. input.
I would try a 9VAC atari power brick first and if that doesn't work, then use a 12VAC brick last...
On the Eprom socket\, you can check pin#24 for 5VDC and pin#21 for 12VDC to 21VDC if you have a volt meter
Thank you, I had already figured out the circuit. Yes, that is the bridge rectifier. Without the software controlling it there won't be any programming voltage applied to the EPROM. Just like most other programmers the programming voltage is turned off until you specifically tell it using the software that you want to program it. I could plug in a power supply and put a meter on the input lead of the transistor that feeds the programming pin, there won't be anything on the output pin until the proper voltage is applied to its base. I already put it away until I can get the program for it.
Anyone have the software for it?