Hello everybody. Im still very new to the site (joined about 2 months ago) And first off i have to say thanks for everyone (especially tokumaru) Who helped me out on making some dev carts. I successflly made Super Mario Bros. 2 Jap version and this strange Super Contra 7. Got em both on some tsrom boards and everything worked great!
But my question is this>
1. It seems like everytime i program an Eprom For the first time it will have an error in it and stop programming, and kind ruin my eprom? Now i dont know if it is like really ruined, but basically will need to be erased before programming again. But this only happens the first time i open up the programmer to work
Now it has happened 3 times, like this. I mean the first time i ever tried to program it happened to my first eprom. Then i was like dang i must have something wrong, so i tried another one and it worked first try, and then another and worked first try. Anyways shut down, started it up a few days later. First eprom had error, and then the following ones worked great.
Anyways I Tried it tonight and first eprom had error, and then the rest of them programmed great????
Now i thought this was perhaps happening because maybe some of the eproms i had werent totally empty. But it seems like quite a coincidence when it happens first time i try it on a new day.
Any ideas anyone?
OH AND BY THE WAY IM USING THE WILLEM EPROM PROGRAMMER (THE $45.00 ONE, AND 27C4001 512 KB EPROMS. BOUGHT FROM EBAY.
But my question is this>
1. It seems like everytime i program an Eprom For the first time it will have an error in it and stop programming, and kind ruin my eprom? Now i dont know if it is like really ruined, but basically will need to be erased before programming again. But this only happens the first time i open up the programmer to work
Now it has happened 3 times, like this. I mean the first time i ever tried to program it happened to my first eprom. Then i was like dang i must have something wrong, so i tried another one and it worked first try, and then another and worked first try. Anyways shut down, started it up a few days later. First eprom had error, and then the following ones worked great.
Anyways I Tried it tonight and first eprom had error, and then the rest of them programmed great????
Now i thought this was perhaps happening because maybe some of the eproms i had werent totally empty. But it seems like quite a coincidence when it happens first time i try it on a new day.
Any ideas anyone?
OH AND BY THE WAY IM USING THE WILLEM EPROM PROGRAMMER (THE $45.00 ONE, AND 27C4001 512 KB EPROMS. BOUGHT FROM EBAY.