power supply voltages ±5 +12 +24

backplane

yel - org - - grn - - gry -            - ps cable
+5    +12     gnd     -5

1   2  3   4   5   6   7   8   9  10
+5  +5 +12 +12 key gnd gnd gnd -5 nc   - on backplane

floppy

gry grn yel grn - grn red
-5  gnd +5  gnd   gnd +24

and AC on a separate 3 pin connector for the spindle

I don't know why but +5 is connected to floppy pins 30 and 32



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the front panel has 6 switches, white ones are momentary

red    blk    blk    wht    wht    wht
pwr    fast   ext    brk   greset  ireset

pin 3 (brk) isn't wired
brk goes to pin 7 instead of 3

connector on backplane

1 greset
2 int/ext
key
4 ireset
5 fast
6 gnd
7 brk/