AT&T Model 6300 Computer (SAMS Computerfacts)
ISBN: 067208984X
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Found in 1 comment on Hacker News
jhallenworld · 2024-01-02 · Original thread
AT&T PC 6300 also had this level of detail-

https://www.pcjs.org/machines/pcx86/att/6300/

https://www.amazon.com/Model-6300-Computer-SAMS-Computerfact...

For IBM, service parts and information were available due to the famous 1956 consent decree:

https://www.gadgetreview.com/ibm-1956-consent-decree#what-di...

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