Just to be clear you are using an UV or OTP?Ī9 is no special pin on a 27C801, it's only to get the chip ID. Here is an HD photos of my setup (I can provide more, if needed):īy the way, is the A9 address supposed to have such a low voltage? I am curious, because in the 27c801 diagram is stated that this is a special pin and it could take up to 13V, as opposed to all the other addresses that do not surrpass 7V. No matter where I place jumper 8 I always get solid 5.03V Vcc. I set the jumpers as adviced by the information:ġ) Remove the jumper from the 3-way jumper (J3) and place it between pins 6 and 7 on the 8-way one (A19 and P1)ĥ) Set anything else to normal (12,7V Vpp and Jumper 1 Jumper2 set to normal)Īfter further research to the board itself (via test h/w from the software) I found out that the pin 26 (Address 9) of the zif has only 3.3V high voltage, when every other address returns 5V. Classic error 0x000000 chip = 0x04 buffer = 0x20Īfter a few research I see that this is a very common problem with this programmer and that you should set the right jumpers before you burn it. I got it all set to program some 27c801 eproms for an snes repro, only to find out it wouldn't even get a bit right after programming.
I just got my pcb5.0 willem eprom programmer (the only one I could afford), the one with the dipSwitches. MCUmall EPROM BIOS Chip Burner Forum - Unable program 27c801 and set Vcc
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