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A Lost IBM PC/at Model? Analyzing a Newfound Old Bios

A Lost IBM PC/at Model? Analyzing a Newfound Old Bios

4 comments

·November 5, 2025
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drfuchs

Any chance it was for the "IBM Personal Computer AT/370" that nobody remembers (perhaps because nobody used)?

viler

That was one option I thought of at first (mentioned in the first section), but the info I found indicated that the /370 models used the same firmware as the "plain" 5170s - if there were any BIOS extensions, they were probably somewhere on the add-on cards. The AT/370 also had 512K of on board RAM, while this BIOS seems to indicate 640K.

mrlonglong

Excellent write-up.

viler

Appreciated, thanks!