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QRZ! Ham Radio 4
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IOBUS.DOC
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1990-11-28
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2KB
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39 lines
FOIL SIDE Rear Panel COMPONENT SIDE
Ground B1 A1 ~I/O Check
Reset (powerup) B2 A2 Data bit 7
+5 V DC B3 A3 Date bit 6
IRQ 2 B4 A4 Data bit 5
-5 V DC B5 A5 Data bit 4
D REQ 2 B6 A6 Data bit 3
-12 V DC B7 A7 Data bit 2
Reserved B8 A8 Data bit 1
+12 V DC B9 A9 Data bit 0
Ground B10 A10 I/O Channel Ready
~MEMW B11 A11 AEN
~MEMR B12 A12 Address bit 19
~IOW B13 A13 Address bit 18
~IOR B14 A14 Address bit 17
~D ACK 3 B15 A15 Address bit 16
D REQ 3 B16 A16 Address bit 15
~D ACK 1 B17 A17 Address bit 14
D REQ 1 B18 A18 Address bit 13
~ D ACK 0 B19 A19 Address bit 12
Clock 4.77MHz B20 A20 Address bit 11
IRQ 7 B21 A21 Address bit 10
IRQ 6 B22 A22 Address bit 9
IRQ 5 B23 A23 Address bit 8
IRQ 4 B24 A24 Address bit 7
IRQ 3 B25 A25 Address bit 6
~D ACK 2 B26 A26 Address bit 5
T/C B27 A27 Address bit 4
ALE B28 A28 Address bit 3
+5 V DC B29 A29 Address bit 2
OSC 14.31818MHz B30 A30 Address bit 1
Ground B31 A31 Address bit 0
ALE Address Latch Enable
T/C Terminal Count (DMA)
AEN Address Enable
MEMR/W Memory Read/Write
IOR/W IO Read/Write