Acorn BBC Master Series - Page 58

Master Series Service Manual
PL1 disc drive
34-way IDC
1 0V 2 (notS/SEL 8")
3 0V 4 (notINX 8")
5 0V 6 NC
7 0V 8 notINX 5 1/4"
9 0V 10 notS0
11 0V 12 notS1
13 0V 14 NC
15 0V 16 notMOTOR
17 0V 18 notDIR
19 0V 20 notSTEP
21 0V 22 notW/DATA
23 0V 24 notWR/EN
25 0V 26 notTK0
27 0V 28 notWR PCT
29 0V 30 notR/DATA
31 0V 32 notS/SEL 5 1/4"
33 0V 34 (notRDY 8")
PL3 printer
26-way IDC
1 STB 2 0V
3 PA0 4 0V
5 PA1 6 0V
7 PA2 8 0V
9 PA3 10 0V
11 PA4 12 0V
13 PA5 14 0V
15 PA6 16 0V
17 PA7 18 0V
19 ACK 20 0V
21 NC 22 0V
23 NC 24 0V
25 NC 26 NC
53 Issue 1