Tandy 1400LT Service Manual page 276

Read Operations (==O,
m=O,
m=
1)
I
Address A1 AQ Read Target
1 COUNT STATUS CNT2 CNTl CNTO 1
40H 0 0 Counter 0
0
41H
Latch Stalus
0
I
1
Do Not Latch Status
Counter 1
0
42H 1 0 Counter 2
Latch Count
Control Register Format for Count Latch Command
1
m m
covntsr
# 0
covntsr
#
I
Multiple Latch Command
Do not Latch Count
Control Regester Format for Multiple Latch Command
Oulpul
Null RWMl RWMO CM2 C M I CMO BCO
count
0
1
Counter
# 2
Selected
Counler
#
2
Not Selected
0 Count Data Valid
Status Data
1 Count Dale Invalid
0 OUT P,"
LOU
F-7