I'm having no luck finding datasheet pdf for these two chipset, very important to decipher the odd 486 SBC I have so I know their jumpers purpose since the original maker was been disbanded and data lost when owner retired in 2015.
I need datasheets on these chips for Chips & Technologies two chipset F84021 and F84025.
I tried google with no luck.
Cheers,
Great Northern aka Canada.
Well AFAIK some of the C&T chipsets the datasheets were kept in house..
Only thing I found was a "Prelim" mentioning 4021 and 4025 as part of the C&T CS4000 "WinChips" chipset and 84021 Bus/Dram controller and 84025 Data buffer..
https://www.datasheetarchive.com/pdf/download … 2520for%2520486
There may be some similarity to the 4031/4035 chipset....
added: if same as this: Micro Industries 486HS with PC104 and ISA SBC any information?
or from: Warning about Micro Industries SBCs. They are propietary in firmware!
Did you buy another ??? My suggestion: Do Not buy anything that is from that company, but think you already said that in the other thread 😀
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
Update, this is best I could find after going thru a bunch. The cs4021 and cs4025 pinout and descriptions are in this:
https://www.datasheetarchive.com/pdf/download … 6DX%2520chipset
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
Did the chipset datasheets help ? I looked around but found no motherboard bios with cs4021+4025 and the 82c735.
This one would probably work if a BIOS could be found....https://theretroweb.com/motherboards/s/diamond-fastbus-vlb
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
That what I considered too. But good question on finding this ROM firmware for this Diamond fast bus board.
Chipset datasheet is somewhat helpful but does not mention anything about the jumpers. I have known one jumper is for the watchdog IC using MAX. SBC boards commonly use watchdog circuitry either is disabled or enabled via jumper.
Cheers,
Great Northern aka Canada.
What is the numbering on the Intel chip near CPU and BIOS ? hard for me to read (bad eyes 🤣)
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
N8242PC, for keyboard bios micro-controller. PLCC 44 package.
Cheers,
Great Northern aka Canada.
