Soeren Anton
Member
So, I got this Compaq Portable III (386DX20), which was basically in pieces, because the previous owner tried to fix a crumbled keyboard cable. I think he forgot to write down the wire colors on the DIN5 connector before trying to replace the cable, because when I got it, each of the 4 wires was soldered to a metal pin. So I think he got tired and started to stick the pins in different combinations into the DIN5 port on the Portable III. It seems that while doing that, he blew something on the system board. I already replaced the keyboard controller chip (Intel 106436-001) on the board, as it got quite hot to the touch, but I'm still getting a 301/304 Keyboard Error in Post.
Now I have some questions. Has somebody tried to connect a normal AT DIN5 or PS/2 keyboard to a Portable III? If I use the original Compaq Keyboard, I'm getting constant buffer beeps while the 301/304 error is on screen, the same with a PS/2 keyboard. The Compaqs keyboard on another Pentium 133 system instead, works perfectly.
I wasn't able to track down any kind of schematic for this machine, or any other Compaq that uses the Intel 106436-001 as keyboard controller (there are quite a few), neither could I find the pinout for the Compaq Portable III's DIN5 connector, but I would assume that it's AT standard for 5V/GND/CLK/DATA, maybe someone could confirm this for me?
Any help would be greatly appreciated.
Now I have some questions. Has somebody tried to connect a normal AT DIN5 or PS/2 keyboard to a Portable III? If I use the original Compaq Keyboard, I'm getting constant buffer beeps while the 301/304 error is on screen, the same with a PS/2 keyboard. The Compaqs keyboard on another Pentium 133 system instead, works perfectly.
I wasn't able to track down any kind of schematic for this machine, or any other Compaq that uses the Intel 106436-001 as keyboard controller (there are quite a few), neither could I find the pinout for the Compaq Portable III's DIN5 connector, but I would assume that it's AT standard for 5V/GND/CLK/DATA, maybe someone could confirm this for me?
Any help would be greatly appreciated.