COPROCESSORSLOT
The Coprocessor Slot signals discussed below apply for most of the
SIGNALS
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.
POWER CONNECTIONS
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 Ground (Ground)
Digital supply ground used by all 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 Supply
(
+
5V)
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
A1
000
can source only
1
Amp, and
even less on the
A500. Pins:
5.
6.
Negative Supply
(
-
5V)
Negative version of the main supply. for small current loads only;
there's a total of 0.3 Amp for the entire A2000 system.
This pin is similar to what's available on the A1
000
and A500,
though these other instances will have different currents available.
Pin:
8.
High Voltage Supply
Higher voltage supply, useful for communications cards and other
(+
12v)
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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