Commodore Amiga A500 Technical Reference Manual page 91

COPROCESSOR SLOT
SIGNALS
POWER CONNECTIONS
Digital Ground (Ground)
Main Supply (+ 5V)
Negative Supply (-5V)
High Voltage Supply
( + 12V)
The Coprocessor Slot signals discussed below apply for most of the
machines, though in some cases the item mentioned exists on only
some of the machines; these are specified. Most of these signals are
directly in common with the 68000. or directly a part of the 68000
local bus. instead of being buffered as on the Expansion Bus. No sig-
nal on a Coprocessor card should load the Local Bus with more than
one "F" series standard load.
The Coprocessor Slot provides several different voltages designed to
supply Coprocessor devices. The A2000 power supply is currently
rated at 200 Watts, which supplies the main board and all other ex-
pansion ports, as well as the Coprocessor Slot.
Digital supply ground used by ail expansion cards as the return path
for all expansion supplies. This is found on all instances of the Local
Bus ports. See p. 98 for pin assignments.
Main power supply the Coprocessor slot, and can supply up to 2.0
Amps of +5VDC on the A2000. The maximum supply current for
the entire A2000 system is 20 Amps for all devices inside the
A2000 that use +5V. including the motherboard. The corresponding
pins on the Expansion Edge of the A1000 can source only 1 Amp,
and even less on the A500. Pins: 5. 6.
Negative version of the main supply, for small current loads only;
there's a total of 03 Amp for the entire A2000 system. This pin is
similar to what's available on the A1000 and A500. though these
other instances will have different currents available. Pin: 8.
Higher voltage supply, useful for communications cards and other
devices requiring greater than digital voltage levels. This is intended
for small loading only; there's a total of 8 Amps for the entire
A2000 system, much of which is normally devoted to floppy and
hard disk drive motors. Found on all instances of Local Bus Ports,
though the available currents may vary. Pin: 10.
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