Tandy 1400LT Service Manual page 277

KEY BOARD/SENSE/CONTROL
Address
060H
061H
062H
Bit Bit data
o/
1
o/
1
o/
1
o/
1
o/
1
o/
1
o/
1
o/
1
1
/o
1
/o
X
1/0
X
X
1
/o
1
/o
1
/o
1
/o
1/0
1
/o
X
1
/o
0
0
Description
Keyboard Bit 0
Keyboard Bit 1
Keyboard Bit 2
Keyboard Bit 3
Keyboard Bit 4
Keyboard Bit 5
Keyboard Bit 6
Keyboard Bit 7
Gate A Timer Chip for Speaker Tone Output
Enable/disable speaker
Read High SW or Read Low SW
Keyboard buffering SW
Keyboard interrupt reset
System status of hardware
System status of hardware
System status of hardware
System status of hardware
To test Timer output
I/O channel check (always low level)
RAM Parity check (always low level)
F-8