Tandy 1400LT - Interrupt Controller I;O Map

Address
091
OBH
(Mode-Register)
00
01
10
11
~
OCH
(software command)
ODH
(software command)
697
OEH
(software command)
00
01
10
11
OFH
(software command)
021H
0-7
Bit 1 Bit data
IMR
4
xx
I- 0/1
5 I 0/1
0-7
1 x
0-7 1 x
I
INTERRUPT CONTROLLER
Description
Selection of channel 0
Selection of channel 1
Selection of channel 2
Selection of channel 3
Verify transfer
Write transfer (I/O to Memory)
Read transfer (Memory to I/O)
Illegal
In case
of bit 6,7=11
~
Auto initialize disable/enable
Address increment/decrement
Demand mode
Single mode
Block mode
Cascade mode
Clear First/Last flip
flop
Read of temporary register/Master clear
__
Clear Mask register
All Mask register
Address I Bit I Bit data 1 Description
I IRR & ISR
F-2