Commodore Amiga A500 Technical Reference Manual page 233

A500
Power Budget
PARALLEL PORT:
1 OmA from pin 14
(
+
5V)
(47R
series resistor to prevent damage if printer grounds this line)
SERIAL PORT:
20mA from pin 9
(
+
12V)
20mA from pin 1 0
(
-
12V)
(47R
series resistor t o limit current)
VIDEO PORT:
1 OOmA from pin 2 3
(
+
5V) No
100mA from pin 2 2
( +
l2V) current
l OmA from pin 21
(
-
12V) limiting
JOYSTICK PORTS (TOTAL)
50mA from pins 7
(
+
5V)
(4.7R current limit)
EXPANSION PORT:
300mA from pins 5 and 6
(
+
5V) No
50mA from pin 1 0
(
+
12V) current
l
OmA from pin 8
(
-
12V) limiting