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The D card has a 37-pin D-sub connector provided on the back plate of these cards for I/O connections.
If all three counters are present, pin 20 is counter C2's frequency output. Otherwise, pin 20 is fused +5V
power.
Assignment Pin Assignment Pin
Ground 1
Digital IRQ Disable 2 C2 Freq Out / Fused +5V 20
Port C 7 Hi 3 Ground 21
Port C 6 Hi 4 Port B 7 22
Port C 5 Hi 5 Port B 6 23
Port C 4 Hi 6 Port B 5 24
Port C 3 Lo 7 Port B 4 25
Port C 2 Lo 8 Port B 3 26
Port C 1 Lo 9 Port B 2 27
Port C 0 Lo 10 Port B 1 28
Counter A0 Freq In 11 Port B 0 29
Ctr A1 P.W.I. (Gate) 12 Port A 7 30
Counter A2 Freq Out 13 Port A 6 31
Counter B0 Freq in 14 Port A 5 32
Ctr B1 P.W.I. (Gate) 15 Port A 4 33
Counter B2 Freq Out 16 Port A 3 34
Counter C0 Freq In 17 Port A 2 35
Ctr C1 P.W.I. (Gate) 18 Port A 1 36
Ground 19 Port A 0 37
Table 8-2: 37-Pin D-Sub Connector Pin Assignments
Manual PCI-DIO-24DH
28