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
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2 posts • Page 1 of 1
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.
Code: Select all
All numbers are IRQs 5 14 10 4 12 . . . . . . . . . . 6 7 15 3 11