is this eprom a compatible replacement for a eeprom \ VOGONS

is this eprom a compatible replacement for a eeprom

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First post, by treeman

Posted on 2019-03-19, 07:25

treeman Offline

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I was going through my parts box and looked closely on a old broken doner video card and it hit me to have a look at the bios, its a eprom by size and quick specs it seems to be a compatible replacement for a 486 512 bios, I have a board with suspected corrupt bios and never had a eprom to test with. anyway the old eeprom (486 bios) is
m27c512-15xfi

the eprom I pulled from the video card is
ht27c512-70

can I flash the bios for the 486 and use the ht27c512 instead of the m27c512?

my research from google says yes, but second option is very appreciated

Reply 1 of 7, by keropi

Posted on 2019-03-19, 07:29

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The HT27C512 is a OTP device which stands for "One Time Programmable" so you cannot erase it and write other data to it.

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Reply 2 of 7, by treeman

Posted on 2019-03-19, 07:32

treeman Offline

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ahhok damn, thanx

Reply 3 of 7, by zyga64

Posted on 2019-03-19, 08:48

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Search for SST27SF512 on ebay. I can see pair for $2.2 including shipping. These are electrically erasable and programmable parts.
I've bought and successfully programmed SST27SF256 for my S3 Virge (VBE 2.0 compatible BIOS).

1) VLSI SCAMP /286@20 /4M /CL-GD5422 /CMI8330
2) i420EX /486DX33 /16M /TGUI9440 /GUS+ALS100+MT32PI
3) i430FX /K6-2@400 /64M /Rage Pro PCI /ES1370+YMF718
4) i440BX /P!!!750 /256M /MX440 /SBLive!
5) iB75 /3470s /4G /HD7750 /HDA

Reply 4 of 7, by treeman

Posted on 2019-03-19, 08:50

treeman Offline

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thanks for the info yeah I think ill get a few 😀

Reply 5 of 7, by matze79

Posted on 2019-03-19, 12:50

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keropi wrote:
The HT27C512 is a OTP device which stands for "One Time Programmable" so you cannot erase it and write other data to it.

Hehe delete it with X-Rays 😁 and oven

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Reply 6 of 7, by zyga64

Posted on 2019-03-19, 12:58

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treeman wrote:
thanks for the info yeah I think ill get a few 😀

I forgot to ask. Do you have access to eprom/flash programmer ? Check if this eeprom is on the list of supported devices.
My programmer is TL866A (now discontinued) but there is newer version - TL866II plus which supports even wider range of devices.

Reply 7 of 7, by treeman

Posted on 2019-03-19, 13:36

treeman Offline

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yes I have the TL8662 plus

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