Dip Switch Settings - Commodore PC 20 User Manual

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AppendixF
DIP Switch Settings
System DIP Switches (Located on Main PCB)
Switch No. Function
1 OFF: Boot
ON: System diagnostic
2
OFF: 8087 installed
ON: 8087 not installed
3,4 System RAM configuration
5,6 Default video mode
7,8 Number of floppy drives. installed
System RAM Installed
Switch No.
Ram Size
3,4
ON,ON 128 KB
OFF,ON 256KB
ON, OFF 512 KB
OFF, OFF 640 KB
Default Video Mode
Switch No.
Function
5,6
ON,ON Monochrome 40 x 25
OFF, ON Color 40 x 25 (B&W mode)
ON,OFF Color 80 x 25 (B&W mode)
OFF, OFF
Monochrome 80 x 25
Number of Floppy Drives Installed
Switch No.
Number of installed drives
7,8
ON,ON 1
OFF, ON 2
ON, OFF 3
OFF, OFF
4