DIGITAL INPUT REGISTER (DIR)
Address 3F7 READ ONLY
This register is read-only.
7
6
5
4
3
2
1
0
DSK
CHG
RESET N/A N/A N/A N/A N/A N/A N/A N/A
COND.
BIT 0 - 6 UNDEFINED
The data bus outputs D0 - 6 will remain in a high
impedance state during a read of this register.
BIT 7 DSKCHG
This bit monitors the pin of the same name and
reflects the opposite value seen on the disk cable.
20