Is there anybody who have sucessfully programmed a 27256 EPROM using the TOP 2049 programmer? I have tried 4 different brands of 27256 and 2 operating systems (Windows XP SP2 and Windows ME) without luck. The programmer never gets past address 0x378 where it stops with:
indicating a mismatch at that address. The programming voltage seems to reach the 12.5 Volts required for the EPROM's I've tested so I'm suspecting that the timing is wrong somehow. Is there anybody here who've looked into this problem in more detail or is the best bet to stay away from the TOP series programmers?
As ZLM has stated elsewhere in this forum, all the newer TOP-programmers currently seem unable to program 27-series EPROMs (NMOS and CMOS alike, it seems). I hope it's a software problem so they can fix it but I have returned my TOP2049 in exchange for a product from a different manufacturer.