Instruction manual

PC27E Page 15
5.3 Main I/O Bus Backplane Connections
Connection to the computer is made through the I/O channel main bus. The pin designations
are shown in Figure 4, but for further information please consult the technical reference
manual for the host computer.
62 Pin Connector (Pins B1 and A1 are at the bracket end of the board)
Ground < B1 A1 < -I/O CHCK
+ Reset< B2 A2 < > SD7
+5 Volts< B3 A3 < > SD6
+IRQ2/9* > B4 A4 <SD5
-5 Volts < B5 A5 < > SD4
+DRQ2 > B6 A6 < > SD3
-12 Volts< B7 A7 < > SD2
-0WS < > B8 A8 < > SD1 C
+12 Volts< B9 A9 < > SD0 O
Ground < B10 A10 < I/O CHRDY M
S -SMEMW< B11 A11 < > AEN P
O -SMEMR< B12 A12 < > SA19 O
L -IOW < > B13 A13 < > SA18 N
D -IOR < > B14 A14 < > SA17 E
E -DACK3< > B15 A15 < > SA16 N
R +DRQ3 < > B16 A16 < > SA15 T
-DACK1< > B17 A17 < > SA14
S +DRQ1 < > B18 A18 < > SA13 S
I -DACK0< > B19 A19 < > SA12 I
DCLK< >B20 A20 < > SA11 D
E+IRQ7< >B21 A21 < > SA10 E
+IRQ6 < > B22 A22 < > SA9
+IRQ5 < > B23 A23 < > SA8
+IRQ4 < > B24 A24 < > SA7
+IRQ3 < > B25 A25 < > SA6
-DACK2< > B26 A26 < > SA5
+T/C < B27 A27 < > SA4
+BALE < B28 A28 < > SA3
+5 Volts< B29 A29 < > SA2
OSC < B30 A30 < > SA1
Ground < B31 A31 < > SA0
* Note: Pin B4 is IRQ2 for an XT
Pin B4 is IRQ9 for an AT which is re-directed as IRQ2
FIG. 4 - MAIN PC BUS BACKPLANE CONNECTOR PIN ASSIGNMENTS