Tandy 1400LT Service Manual page 272

Initialization Word Format
IW1 (Initialization Word 1)
1
IW4
I W 4 Write
t
Selection
I
0
I
I W 4 Not Written
The Higher 3 Bits of
the Lower Byte of
the Interrupt Routine
i
Address in CALL Mode
Interrupt
Scale
T
1
I
Single Mode
0 Extended Mode
I
T
lNTP
T r i g g e r
1
I
Level-Trigger Mo d e
0 Edge-Trigger Mo de
I
IW2 (Initialization Word 2)
At5-Aa: Higher Byte of Interrupt Routine
Address in CALL Mode
V7-V3:
The Higher 5 Bits of Interrupt
Vector Number i n Vector Mode
At5-Aa:
V7-V3:
The Higher 5 Bits of InterruDt
Higher Byte of Interrupt Routine
Address in CALL Mode
Vector Nu mb e r in Vector Mode
I
F-3