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All Revisions (1988-89)

PC3_Diagram

Connections
PurposeLocationPurposeLocation
KeyboardJ1Serial PortJ9
Atari External Floppy PortJ3Atari Mouse PortJ10
Floppy Drive InterfaceJ4SpeakerJ11
9 Pin EGAJ5LED PanelJ15
Parallel PortJ7External BatteryJ25
Jumper Setttings
FunctionJumperPosition
NPU EnabledW11-2
NPU Disabled (default)W12-3
One Internal FDDW2
W4
1-2, 3-4
2-3, 4-5
Two Internal FDDW2
W4
2-3, 4-5
1-2, 3-4
EGA IRQ2 Enabled (default)W5Open
EGA IRQ2 DisabledW5Closed
Monitor Selector (SW1)
FunctionSwitch 4Switch 3Switch 2Switch 1
EGA (SMART On)OFFONOFFOFF
EGA (SMART Off)OFFONONOFF
ColorONOFFOFFON
MonochromeONOFFONON

Note: The switches are numbered 4, 3, 2, 1 reading from left to right.