APPENDIX A I/O PORT ADDRESS MAP
I/O Uaddress
Uses
range (Hex)
-----------------------------------------------------------
000-1FF
Used by base system board
200
Not used
201
Game control
202-277
Not used
278-27F
Second printer port
280-2F7
Not used
2F8-2FF
COM2:
300-377
Not used
378-37F
Printer port
380-3AF
Not used
3B0-3BF
Monochrome and printer
3C0-3CF
Not used
3D0-3DF
Color & graphics
3E0-3EF
Not used
3F0-3M
5 1/4 inch disk drive
3F8-3FF
COM1:
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