; Read-only and read/write ports, blank symbol for write-only
1F=KEMPSTON
7F=BLUEALPHA
80=LEPR
81=HEPR
D0=QUAZAR
D4=
E0=D1_STATUS
E1=D1_TRACK
E2=D1_SECTOR
E3=D1_DATA
E4=D1_STATUS
E5=D1_TRACK
E6=D1_SECTOR
E7=D1_DATA
EF=CLOCK
F0=D2_STATUS
F1=D2_TRACK
F2=D2_SECTOR
F3=D2_DATA
F4=D2_STATUS
F5=D2_TRACK
F6=D2_SECTOR
F7=D2_DATA
F8=LPEN
F9=STATUS
FA=LMPR
FB=HMPR
FC=VMPR
FD=MIDI
FE=KEYBOARD
FF=ATTR

; Write-only ports, blank symbol for read-only (both have bit 15 set)
801F=
80D4=SID
80F8=CLUT
80F9=LINE
80FE=BORDER
80FF=SAA
