UMC and PIC IDE controllers \ VOGONS

UMC and PIC IDE controllers

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First post, by pshipkov

Posted on 2024-05-22, 16:51

pshipkov Offline

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I am looking at these two ISA IDE controllers
Unknown TK-82C869/865 2J D01
Unknown TK-82C869/865 2J D04 (PiC P4020, P4021)

Names are similar, assemblies are similar, almost identical.
We know UMC designed and produced(?) their own chips.
Not sure about PiC.

The PiC based controller is great. The UMC one - not so much.
Yet, i have the feeling that the PiC chips are relabeled UMC silicon.

Couldn't find anything online for either controller.
Nor about PiC.

Any hints ?

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Reply 1 of 9, by waterbeesje

Posted on 2024-05-22, 21:12

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You're right UMC designs end fabricates it's own chips. And they do lots of OEM stuff as well. Mostly they're pretty rock solid as well. This makes the idea of the relabeled UMC very much possible

Stuck at 10MHz...

Reply 2 of 9, by Tiido

Posted on 2024-05-22, 23:55

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Same font and exactly same package details, so definitely coming out of same factory.

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Reply 3 of 9, by AngelaTheSephira

Posted on 2024-05-25, 04:09

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The fact the UMC one isn't working is odd, I've always heard UMC stuff was rock solid. I wonder if something's damaged.

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Reply 4 of 9, by pshipkov

Posted on 2024-05-25, 06:13

pshipkov Offline

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Both controllers are working, but the PiC one is working++.

UMC IDE chips and based on them controllers are not good. That's for sure.
So, if this is a relabeling job, i am not sure how the PiC chips are so good.
Or maybe it was just dumb luck that materialized in the specific design/assembly.

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Reply 5 of 9, by majestyk

Posted on 2024-05-25, 06:31

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Some of these Super-I/O and IDE chips were pin compatible. One of the "PIC" chips (or both) might be some relabeled Winbond, SMC, Acer, whatever...

Reply 6 of 9, by pshipkov

Posted on 2024-05-26, 00:45

pshipkov Offline

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Do you know specific brands/models that are pin compatible ?
It can easily be that with the pic/umc chips.

retro bits and bytes

Reply 7 of 9, by evasive

Posted on 2024-05-30, 20:29

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"TK" isn't exactly having a good reputation with me. So the PiC card could be less used or something, it may fail later on. Like many TK products did...

Reply 8 of 9, by evasive

Posted on 2024-05-30, 20:30

evasive Offline

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pshipkov wrote on 2024-05-26, 00:45:

Do you know specific brands/models that are pin compatible ?
It can easily be that with the pic/umc chips.

We are building a list as we go.

Pretty sure of this already:
PIC P4020 = UM82C863F
PIC P4021 = UM82C865F

Reply 9 of 9, by pshipkov

Posted on 2024-05-30, 23:32

pshipkov Offline

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I hear you about "TK".
Yet, this ordinary looking IDE controller is something else.

How confident you are about the PIC-UMC relabeling ?
Is it a hunch, or you found evidence out there ?

retro bits and bytes

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