28p DIP EEPROMs? \ VOGONS

28p DIP EEPROMs?

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First post, by dionb

Posted on 2019-09-15, 23:31

dionb Offline

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Messing around with ancient 512kb UV-EPROMs is something of a pain. I'd far prefer to use nice simple EEPROMs for my 386/486 era boards. Of course it's possible to flash a small image onto a larger chip, but form factor is an issue: I can't seem to find any 28 pin DIP EEPROMs.

Do they simply not exist? Or am I missing something?

Reply 1 of 4, by quicknick

Posted on 2019-09-15, 23:37

quicknick Offline

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Check out Winbond W27C512 (and W27E257 if you need 256kbit ones).

Reply 2 of 4, by keropi

Posted on 2019-09-16, 05:26

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Yep w27c512 is the way to go 😀

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Reply 3 of 4, by dionb

Posted on 2019-09-16, 05:58

dionb Offline

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How did I manage to miss that one? Great, looks like the one alright 😀

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Reply 4 of 4, by maxtherabbit

Posted on 2019-09-16, 13:51

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you can use 28c256 parts as well, just remember that A14 will always be driven high so you will only be able to access the upper 16kB of the ROM

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28p DIP EEPROMs?

Topic actions

First post, by dionb

Reply 1 of 4, by quicknick

Reply 2 of 4, by keropi

Reply 3 of 4, by dionb

Reply 4 of 4, by maxtherabbit