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UMC8881/8886 Datasheet

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Reply 21 of 32, by Comos

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red-ray wrote on 2020-05-12, 22:00:

This databook is for the older UMC stuff.We are talking here about the UMC chipset from the middle of the 90's.

Reply 22 of 32, by CuPid

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Still there are the ctchip config files that provide interesting data. Not a complete datasheet, but it seems that most populated registers are described (if this is what you are looking for).

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  • Filename
    Um881.cfg
    File size
    6.03 KiB
    Downloads
    22 downloads
    File license
    Fair use/fair dealing exception

I need a vacation.

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Reply 23 of 32, by mR_Slug

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wiretap wrote on 2019-08-27, 20:03:

They are design books from the mid 1990's.. Like 2 dozen of them, each 500+ pages. I don't know about scanning them because they still might be under NDA or patent/proprietary information. I have them at work, but don't have any way to scan that many pages anyhow. I'll have to try to find them, in our huge library of microprocessor books.

I'm looking for that elusive datasheet too, also the UM8498/8496 among others. Please if you can get a hold of it, i'd be willing to scan it. Spent ages looking everywhere for that datasheet, from my searching it is not on the net.

===
FWIW, I have extracted the major details out of the file on bitsavers for the other UMC 486 chipsets, perhaps there are a few others:
http://66.113.161.23/~mR_Slug/chipset/chipset … 1=33131,2#29352

EISA .cfg Archive | Chip set Encyclopedia

Reply 24 of 32, by wiretap

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Haven't been able to find it.. we moved offices to a different building, and our engineering library of books was moved into multiple cabinets across 3 offices (each office is like 25k square feet, 2 floors).. I'll come across them sooner or later, I just don't have the time to look through the several hundred locked cabinets they could be in.

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Reply 25 of 32, by Anonymous Coward

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CuPid wrote on 2020-05-13, 09:18:

Still there are the ctchip config files that provide interesting data. Not a complete datasheet, but it seems that most populated registers are described (if this is what you are looking for).

Those are useful, but what would also be really nice are the pinouts.

"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium

Reply 26 of 32, by Roman555

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Anonymous Coward wrote on 2020-05-13, 12:42:
CuPid wrote on 2020-05-13, 09:18:

Still there are the ctchip config files that provide interesting data. Not a complete datasheet, but it seems that most populated registers are described (if this is what you are looking for).

Those are useful, but what would also be really nice are the pinouts.

I remember I have got a schematic manual for UMC based laptop Mitac 5023. I'll upload it here.

Here it is

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  • Filename
    Mitac 5026 (shorter version).zip
    File size
    426.05 KiB
    Downloads
    13 downloads
    File comment
    Mitac 5026 Service Manual
    File license
    Fair use/fair dealing exception
  • Filename
    Mitac 5023.rar
    File size
    1.73 MiB
    Downloads
    16 downloads
    File comment
    Mitac 5023 Service Manual
    File license
    Fair use/fair dealing exception

Reply 27 of 32, by Comos

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Roman555 wrote on 2020-05-14, 11:20:
Anonymous Coward wrote on 2020-05-13, 12:42:
CuPid wrote on 2020-05-13, 09:18:

Still there are the ctchip config files that provide interesting data. Not a complete datasheet, but it seems that most populated registers are described (if this is what you are looking for).

Those are useful, but what would also be really nice are the pinouts.

I remember I have got a schematic manual for UMC based laptop Mitac 5023. I'll upload it here.

Here it is

Thanks,
interesting is, that even it's for the Socket 5 Pentium system, the PCI/ISA Bridge is still UM8886, so atleats we have the pinout 😀
For me the most important are also the registers besides pinout, but I believe they are partly the same with it's predecessor.

Reply 29 of 32, by Tiido

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This is nice, thänk you ~

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Newly made 4MB 60ns 30pin SIMMs ~
mida sa loed ? nagunii aru ei saa 😜

Reply 30 of 32, by Stiletto

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red-ray wrote on 2020-05-12, 22:00:

Well, actually that's a copy of the Bitsavers (the source of the scan) databook I linked to earlier.

wiretap wrote on 2020-05-13, 12:13:

Haven't been able to find it.. we moved offices to a different building, and our engineering library of books was moved into multiple cabinets across 3 offices (each office is like 25k square feet, 2 floors).. I'll come across them sooner or later, I just don't have the time to look through the several hundred locked cabinets they could be in.

I'm a little worried you may be our only hope. Fingers crossed that someday you have the time to locate it and then figure out how to navigate the NDA/trade secrets morass you mentioned earlier. Not a good situation to be sure, but here's hoping. 😀

In the meantime we'll hope that another databook shows up elsewhere out of the blue, but Bitsavers hasn't made any new acquisitions on that front recently either...

"I see a little silhouette-o of a man, Scaramouche, Scaramouche, will you
do the Fandango!" - Queen

Stiletto

Reply 32 of 32, by Roman555

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mpe wrote on 2020-05-15, 09:34:

Yes. UMC stuff are particularly hard to find.

I'd be also interested in early ALI chipsets. The same story....

I suppose Mitac 4024 , Mitac 4023 (Chaplet Halikan NBD-486) based on ALI M1219. Is it early enough?
There were a service manual for Mitac 4024 but now it's dificult to find.
http://web.archive.org/web/20010122102100/htt … /service/Tr.htm