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BYPASS ICs WITH 0.1 uF CAPACITORS FROM +5 VDC TO GROUND. A09 A08 A07 A06 A05 A04 A03 A02 D0 D1 D2 D3 D4 D5 D6 D7 34 33 32 31 30 29 28 27 D0 D1 D2 D3 D4 D5 D6 D7

+5 B29 26 PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA7 PB0 PB1 PB2 PB3 PB4 PB5 PB6 PB7 PC0 PC1 PC2 PC3 PC4 PC5 PC6 PC7 CS 7 +5 6 25 PIN D SOCKET 4 3 2 1 40 39 38 37 18 19 20 21 22 23 24 25 14 15 16 17 13 12 11 10 B01 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

8255A PPI

B14 B13 A31 A30 B02 B01 B29 A21 A22 A23 A24 A25 A26

IOR IOW A0 A1 RESET DRV +5 16 A10 A9 A8 A7 A6 A5 4 6 5 3 2 1 G2A G1 G2B C B A U2 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 8 B29 AEN B29 +5 A4 A3 A2 4 5 6 3 2 1 G2A G2B G1 C B A U3 7 9 10 11 12 13 14 15

5 36 9 8 35

RD WR A0 A1 RESET

U1

LS138 B31

16 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 B31 7 9 10 11 12 13 14 15

A11 A27 A28 A29

24 LINE PARALLEL INTERFACE

LS138 IBM CARD EDGE CONNECTOR