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9.9
P9 — Disk Drives 0 and 1
Pin
Assigment
2
/DENSEL
4
Not used
6
DRATE0
8
/INDEX
10
/MTR0
12
/DR1
14
/DR0
16
/MTR1
18
/DIR
20
/STEP
22
/WDATA
24
/WGATE
26
/TK0
28
/WPROT
30
/RDATA
32
/HDSEL
34
/DSKCHG
Pin 1 is at the bottom-right when holding the board with the battery to the
bottom-right.
All odd-numbered pins are Ground. Drive wiring is the usual PC/AT type, with
lines 10. . .16 switched around between the drives. The Drive 0 and 1 signals are
logically interchanged within the IO chip, so that the drive connected without
a twist in the cable is Drive 0. This will typically be the drive on which the
board is mounted.
9.10
P10 — Disk Drives 2 and 3
Same as P9, but decodes Drives 2 and 3.
9.11
P11 – Battery Isolator
Pin
Assigment
1
Ground
2
Battery -ve
43
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