First post, by devicemodder
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Newbie
Thinking of trying to roll my own 486 board, but I need a schematic to go off of. Anyone have any 486 schematics that I can use? Can't seem to find any online.
Reply 1 of 11, by jakethompson1
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It would be highly chipset dependent. There is one for a 386 at the end of this datasheet though to get you started: https://theretroweb.com/chipset/documentation … 8e471224329.pdf
Reply 2 of 11, by devicemodder
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jakethompson1 wrote on 2024-08-03, 22:55:It would be highly chipset dependent. There is one for a 386 at the end of this datasheet though to get you started: https://theretroweb.com/chipset/documentation … 8e471224329.pdf
Thanks. I do have a spare 386 processor sitting around...
Reply 3 of 11, by Aui
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You could check one of the recent RMC episodes:
https://m.youtube.com/watch?v=7bf-Stkm_4A
Also not a 486 (but a Commodore PC20) but I think they too share a complete board layout.
Reply 4 of 11, by rasz_pl
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l33t
How about 386? https://alexandrugroza.ro/microelectronics/sy … sbmc/index.html
chipset supports 486 so its just a matter of wiring different socket
https://github.com/raszpl/FIC-486-GAC-2-Cache-Module for AT&T Globalyst
https://github.com/raszpl/386RC-16 memory board
https://github.com/raszpl/440BX Reference Design adapted to Kicad
https://github.com/raszpl/Zenith_ZBIOS MFM-300 Monitor
Reply 5 of 11, by devicemodder
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rasz_pl wrote on 2024-08-04, 21:35:How about 386? https://alexandrugroza.ro/microelectronics/sy … sbmc/index.html
chipset supports 486 so its just a matter of wiring different socket
That could work
Reply 6 of 11, by zami555
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Newbie
Here is the only schematic I've found some time ago for 486. It's the AMD reference design for PCI board based on Am486 with PCI made with Ali chipset:
https://www.elenota.pl/datasheet-pdf/59686/AM … f3ff052593f4a4f
Reply 7 of 11, by Horun
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Here is Intels Low power 486sx eval board doc with schematic: https://www.ardent-tool.com/CPU/docs/Intel/48 … /272815-001.pdf
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 8 of 11, by akimmet
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Horun wrote on 2024-08-10, 03:48:Here is Intels Low power 486sx eval board doc with schematic: https://www.ardent-tool.com/CPU/docs/Intel/48 … /272815-001.pdf
There are no schematics in this pdf. It looks like the schematics were included with the software package for the board.
Reply 9 of 11, by EduBat
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Newbie
At the end of this page, there is a file called ULP486sx.pdf which is a schematic for a 486 computer. Hope it helps.
https://www.retrobrewcomputers.org/doku.php?i … linux-sbc:start
Reply 10 of 11, by Horun
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Yep that is it EduBat, for the Intel 486sx eval board. I forgot that the schems were separate. was back in 2017 when I grabbed the files off the Intel developer site, my bad.
Here is what I grabbed, same but as separate .pdfs.......
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 11 of 11, by Horun
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Ohh forgot this which is the original Intel dev schem .ps and .sch files from 1995/96...can be opened with 7zip
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