I had a professional EPROM programmer and discovered the hard way that it didnt verify erase margin correctly. Paying hundreds of dollars for a commercial programmer doesnt necessarily mean it programs devices reliably. I work around that unknown by verifying programmed devices at several voltages (all mentioned in typical programming algorithms). Willem programmers satisfy my needs though I would like software to be more open so the algorithms can be examined. Hi John, I dont have any recommendations for other programmers. Since Willem programmers are hobbyist level, they assume you know something about programming EPROMs so you can do it reliably. Universal Eprom Programmer All of the components needed should be readily available most of what you need is on the programmer you purchased. I sold Willems programmers in the US and have small number of bare boards Id sell at cost if youre interested in assembling your own. The only Willem variant I would consider buying is the 4.1 which has a relay to switch VCC so it can handle NMOS EPROMs (2716, 2732, etc) and higher capacity CMOS EPROMs (larger than 1Mb). That means they struggle to produce VPP 12.5V, some even struggle to provide 12.5V. Just understand that all PCB3 variants use a step up regulator to generate VPP and they opt for an inexpensive molded inductor that saturates at a low current. Id start with version 0.97ja Its been awhile since Ive thought about that programmer, but I do recall that that design uses the output of an OP AMP to supply some of the voltages.īecause they typically sand the part numbers from the ICs on that variant, its difficult to modify.Ĭlick to expand.If youre going to program enough EPROMs to justify not having someone else program them for you and you want to stay with an inexpensive Willem based programmer, any PCB3 variant, ATH3.1, or Willem 4.1 can be made to work. That being said, you can download software from. USB to Parallel converter cables will NOT work since they only support enough parallel commands to control a printer and nothing else.

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