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You currently have javascript disabled. Several functions may not work. Please re-enable javascript to access full functionality. Posted Mon Feb 17, 5: I’ve had lots of problems with these “used good” 27C eproms that are typically found on eBay and even major suppliers. They all seem to erase OK, but more than half seem to have programming issues — “device did not program. I use these in my Atari’s typically in Dropcheck’s 4-in-1 OS adapter.


Are there better alternatives? Posted Mon Feb 17, 6: Posted Mon Feb 17, 8: Are you sure you erase long enough? Is the rprom absolutely clean?

Alternatives for 27C Eproms – Atari 8-Bit Computers – AtariAge Forums

Is there a feature that let you program slower? Passes blank checks with no issues. Unfortunately, I can’t slow down the programming. Glass is spotless, but that would only affect erasing.

But I have stopped throwing eproj away — I have a new programmer coming that may have more features — certainly programs many, many more devices.

eprom 27C512 or 27512 + Flash programmation included

Posted Mon Feb 17, 9: I pretty much always erase my devices for minutes instead of the typical just to ensure this doesn’t happen. Posted Mon Feb 17, Epfom 27c pulls that I have used I agree if not Double erase time use I get failed programed notice also.

I agree with the Double erase time needed. Posted Wed Feb 19, 7: Posted Thu Feb 20, 1: I purchased a lot of 5 at first and had 2 bad chips in the lot but the vendor sent me another 5 to eprmo the issue so I can’t complain.


This is the vendor I bought the chips from. Community Forum Software by IP. Have You Played Atari Today? Javascript Disabled Detected You 275c12 have javascript disabled. Please log in to reply. In the past I have had nothing but trouble with National Semiconductor eproms notable nms27c and nms27c pulled from old VGA cards, when trying to program them on a Willem programmer first revision.

Only found eproom out after I switched to a Hi-Lo All But, as you already have a dedicated eprom programmer at hand, you can switch over to using flashroms.

From my own experience, a 28F or 29F will work fine. I’ve forgotten my password. Remember me This is not eptom for shared computers. Sign in anonymously Don’t add me to the active users list. AtariAge Home Lynx Jaguar.