I have 4 PC Chips M507 boards (two dead). They have JP4 jumper which is not documented anywhere. The only thing that's printed on the board is "JP4: IRQ". It's between the ROM and RTC, consists of 5 two-pin jumpers. They were all open on all 4 boards. Using ohm-meter, found out that the upper pins are connected to IRQ lines (5, 14, 10, 14 and 12). I guess that it's IRQ selection for something. But for WHAT
Weird thing: the bottom pins are NOT connected together
PC Chips M507 - what's JP4 for?
Patched and tested BIOSes are at http://wims.rainbow-software.org
UniFlash - Flash anything anywhere
UniFlash - Flash anything anywhere
No IRQ selection. Ohm-meter shows that all pins are IRQ lines. Looks like this is not a jumper field but a connector for some kind of diagnostic device.
Pinout:
Pinout:
Code: Select all
All numbers are IRQs
5 14 10 4 12
. . . . .
. . . . .
6 7 15 3 11
Patched and tested BIOSes are at http://wims.rainbow-software.org
UniFlash - Flash anything anywhere
UniFlash - Flash anything anywhere