MC-10 Extension Multiport Joystick Info

Memory Mapped I/O Ports

Looking over the MC to the Extension Multiport plugged in behind:

The lefthand port is address $BF34 / 48948
The righthand port is address $BF30 / 48944

Joystick Decoding

The directions and button are all read from the same address for each port:

bit 0 of the port: 1=up
bit 1 of the port: 1=down
bit 2 of the port: 1=left
bit 3 of the port: 1=right
bit 4 of the port: 1=pressed

Test Code

10 CLS
20 PRINT PEEK(48944)
30 PRINT PEEK(48948)
40 FOR I=1 TO 50:NEXT
50 GOTO 10

Thanks to MrDave for the port numbers!

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