ABCDEFGHIJKLMNOPQRSTUVWXYZAA
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Tristate pinsOPEN1-22-3Notes
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J13Game Port EnabledisabledENABLEDdisabled
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J12Unknown
Defaults to 1-2 on my board. No observable changes when reconfiguring.
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J11Unknown
Defaults to 2-3 on my board. No observable changes when reconfiguring.
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J10LPT1 EnableENABLEDENABLEDdisabled
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J9COM1 EnableENABLEDENABLEDdisabled
(if disabled, COM2 address is shifted to COM1 in DOS)
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J8COM2 EnableENABLEDENABLEDdisabled
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J7COM2 IO Address2F8h2F8h2E8h
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J6COM1 IO Address3F8h3F8h3E8h
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J5LPT1 Address378h378h278h
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J4IDE EnableENABLEDENABLEDdisabled
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J3Floppy Disk EnabledisabledENABLEDdisabled
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J2IDE Channel ModePrimaryPrimarySecondary
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J1Floppy Disk Enable #2disabledENABLEDdisabled
Odd to have two jumpers that would both enable/disable floppy. It feels as if this should be a Primary vs Secondary swap,
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but that does not seem to be the case.
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JP19 (two pins)
IOCHRDY (IO Channel Ready)
Defaults to closed on my board. Closed is presumably enabled and open=disabled, but this is only a guess
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(not verified, but very likely since the pins do connect to IOCHRDY pin on the IDE connector)
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JP20 (four pins)
IDE HDD Led (not verified)
Pinout not sure
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See https://www.vogons.org/viewtopic.php?f=46&t=85419
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