Commodore Amiga A500 Technical Reference Manual page 231

Section
7.2
Power Budgets
B2000 POWER BUDGET
A200O/B2000 POWER SUPPLY:
All
of the specifications herein are suggested. When it comes right
down to it, the machine is being powered by a well-defined supply,
the specifications of which will follow. If you're careful not t o exceed
the suggested load for any port, you'll be able t o fully load every
port. However, some of the internal ports can draw more than the
suggested amount; for example, an 8
megabyte expansion memory
card for the l 0 0 pin bus may draw more than the suggested 2.5
Amps at
+
5VDC. The connector is capable of supplying more with-
out damage, but the extra current must be carefully worked into the
system power budget. Any hardware add-on device that draws more
than the suggested amount must state this clearly. External ports
typically have a true maximum available, not a suggested; budgeting
should apply to internal items only.
VOLTAGE
+
5 VDC
+
5 USER
-
5 VDC
+
1 2 VDC
+
1 2 USER
-
1 2 VDC
-
1 2 USER
SYSTEMWIDE
LIMIT
20.0 Amps
0.5 Amps
0.3 Amps
8.0 Amps
-
- - - - - - -
-
0.3 Amps
-
-
-
- - - - -
DESCRIPTION
Main
+
5 Voltage supply
Protected
+
5 for externals
Negative 5 Volt supply
Main
+
1 2 Voltage supply
Protected
+
1 2 for externals,
derived from main
+
1 2
Main
-
1 2 Voltage supply
Protected
-
1 2 for externals,
derived from main
-
1 2
CONSUMPTION:
Everybody wants power. Here's what can be taken, based on your particular setup; you
get what's left over:
MAIN SYSTEM: +5VDC -5VDC +SUSER
+
12VDC
-
12VDC
Motherboard 2.5A
--- ---
--- ---
50mA 50mA
Internal 3%" Floppy [ l ] 250mA 350mA ---
Internal 51/411 Floppy [2] 500mA
---
---
500mA
---
Internal 3%" Hard Disk [2]
750mA
--- ---
l . O A
---
Internal
5l/4"
Hard Disk [2] l . O A --- --- 1.5A
---