Tandy 1400LT Service Manual page 274

Command Word Format
IMW (Interrupt Mask Word)
M i Me M5 M4
M3
M Z
M i MO
PFCW (Priority Finish and Control Word)
1
1 0 1
Polling Command
D 7 De Ds D 4
D3
DZ Di Do
1 1 1 7
0
No Level Without Rotation Normal FI Command
Normal Rotation FI Command
Designation
With Rotation
Without Rotation Specific FI Command
No Operation
Rotation and
MCW (Mode Control Word)
Aa
1 0 1
D 7 D e
D5
D 4 D3
Dz D i Do
X
I
SNM
I
EXCN
I
0
I
1
I
POL
I
SR
I
I S / m
I
0 X No Operation
1 1 IRR Select
F-5