Reply 20 of 26, by Horun
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That is great !
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 is great !
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
Excellent work, congratulations
Maybe you were lucky, but what matters is that it has started, from there you can make upgrades if necessary to adapt it to your needs.
However, it could also be that the RAM was the problem with the failed startup, I don't know if you had already tried that module, for future (possible) upgrades, I recommend using RAM with identical chips.
AMD 286-16 287-10 4MB HD 45MB VGA 256KB
AMD 386DX-40 Intel 387 8MB HD 81MB VGA 256KB
Cyrix 486DLC-40 IIT387-40 8MB VGA 512KB
AMD 5X86-133 16MB VGA VLB CL5428 2MB and many others
AMD K62+ 550 SOYO 5EMA+ and many others
AST Pentium Pro 200 MHz L2 256KB
Excellent news! A New Year's gift.
Hello everybody.
My P3B-F suddenly stopped working. I will use the same thread because I have the same symptoms - the MB turns ON but no POST, no activity on the POST card too, no beeps except the siren tones when there is no CPU. I found out that all voltages on the VRM are fine, but POWERGOOD is low. That’s why I lifted the pin from the motherboard and used a 10K pull-up and it went high, so VRM is working fine but the POWERGOOD is hold low by something else. I tried to find where it goes without success. Can someone help me which other element(s) is/are monitored and participate to POWERGOOD evaluation?
drianov wrote on 2024-12-08, 12:34:I found out that all voltages on the VRM are fine, but POWERGOOD is low. That’s why I lifted the pin from the motherboard and used a 10K pull-up and it went high, so VRM is working fine but the POWERGOOD is hold low by something else. ...Can someone help me which other element(s) is/are monitored and participate to POWERGOOD evaluation?
"funny" because the only Asus P3B-F diagram floating around has this pin unconnected 😐 P2Bs connect VRM pgood pin straight to RESET.
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
Yes, it’s probably not monitored at all because I get beeps from memory now. Unfortunately when I put some memory the motherboard cycles reset, and does not issue any beep without a video card (AGP, PCI or ISA).
Can you give me a link to the schematics?
Thank you!
its in this big pack https://vinafix.com/threads/shematic-boardvie … -desktop.19882/
but warning, p3b-f one is just a bunch of scans of diagram blocks put into pdf on lowish resolution 🙁
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