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I have managed to program EPROMs with my G840, so it's not a total fraud. Same results on half a dozen each of these chips, so I think it's not the particular chips, although they are old and some are used. The Lattice 16V8s could be erased, but not written at all (all fuses remain at $FF) the Nat Semis were programmed, but with 10% to 20% of false fuses. Now for the big question: Has anyone managed to program GALs with this thing (either the G540 or the G840)? While I am waiting for a few new Atmel ATF GALs to arrive, I have tried various Lattice and Nat Semi 16V8s from my box of leftovers. The software will still have an awkward GUI with Chinglish text, but will essentially work. Stick with the default path, or some other folder with write access. The software wants to write settings infomation to its main folder, and produces all kinds of quirky error messages when it can't.
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I also want to program ancient EPROMs with 25V programming voltage, and the G540 is known not to have sufficient power for this.) Learning #1: While the ads and the manual claim that you can power the G840 via USB, as long as you do not need the extra power - do not bother trying! The USB +5v line is unconnected inside the G840, so you always need the external power supply.
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(There is a G540, which supposedly is identical except for the fact that it is USB-powered only. I opted for the G840 model, which has an external power supply.
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After a couple of hours playing with it, I can share some first tips, and have one big question: So far, it has lived up to my expectations.
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The software of this programmer is compatible with Windows Vista, Windows 8 and Windows 10. This programmer is very convenient to use because of the feature-USB connection as it uses no external power supply. I opted for a Chinese Genius G840 USB programmer $80 shipped from ebay. Salient Features Of Genius G540 Bios Programmer: It is a 40-pin ZIF socket programmer. But given the fact that I wil use it rarely, I wanted to keep costs down. So I figured it's time to buy a new programmer. My homebrew EPROM and GAL programmers are both from the early 90s, require a parallel port on the PC, and refuse to support any more recent chips.