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 to exceed
the suggested load for any port, you'll be able to 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 l00 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
+
12 VDC
+
12 USER
-
12 VDC
-
12 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
+
12 Voltage supply
Protected
+
12 for externals,
derived from main
+
12
Main
-
12 Voltage supply
Protected
-
12 for externals,
derived from main
-
12
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 .OA
---
Internal
5l/4"
Hard Disk [2] l .OA
---
---
1.5A
---
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