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IBM Personal Computer 365 / M/T: 6589-17U / Voltage Regulator Module (VRM)

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Reply 20 of 24, by Horun

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If you are thinking of the GTL+ 1.5v bus (also called VTT, which runs at up to 66mhz), it is not supplied by the off board VRM. Only the Vcc for cpu and cache are....
according to the Power Distribution Guide and Pro Family Developer vol 1 from the way I read things...

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

Reply 21 of 24, by weedeewee

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Horun, ok, no prob then.

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Reply 22 of 24, by Sphere478

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I was gonna say, I didn’t see anything more that looked important on the vrm pinout 🤣.

I don’t think I need to do anything with the remaining signals do I?

Sphere's PCB projects.
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Sphere’s socket 5/7 cpu collection.
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SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
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Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 24 of 24, by Sphere478

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freesofia wrote on 2022-08-31, 10:54:

I bought two of these VRM: https://www.ebay.com/itm/223867408142 - Working perfect in my IBM 365 !

Sweet!

Btw

New Socket 8 VRM project

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

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