[no subject]

- The casette input goes through an op-amp, which uses the -5V rail.
- The keyboard micro uses the -12V rail.
- The Power On indicator LED uses the +12V rail.
- Some parts of the video circuitry use the -5V rail.
- The 14M oscillator circuit uses the +12V rail.

The rails are all available on the slots (except the auxiliary slot,
which only provides +5V).  The 4-pin video connector provides +12V and
-5V.  Other connectors (e.g. game port) only provide +5V.

The "burn in power pads" (at the front of the motherboard) also
provide the +12V, +5V and -5V rails.
-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand