First post, by Fdiskitup
After several months of tinkering I have a HP RS/20 8mb 386 system that will post !
The HP museum online has a ton of documentation - circuit schematics, Software disks, which has been really helpful.
To get to this point i had to :
1, clean 30 years worth of grime off everything.
2, replace the oscillator crystal (Y2) 36kHz,
3, extracted the leads off an ATX psu from the 20 pin molex to fit on the in line 17 pin power header.
4, add a switch to set power header pin 1 to ground so it boots.
5, run setup from a floppy for the bios to set time, date, drives, ram size
6, replace the lithium cmos battery with 4xAA in a holder.
I can install dos on a floppy for boot, but now I need a hard drive.
The drive controller card is for ESDI drives, card type WD1007A-WA4 F000
2 flavours of this card exist with different ROMs :
F301R - will enable all types of esdi without modifying the system rom.
F300R - will only allow drive tables from systems rom bios.
Not sure which rom I have - paper label on the rom chip says 62-002067-031 (1988)
Edsi drives are expensive on ebay…
So, is there any type of CF adaptor that will mimic ESDI ?
