Tandy 1000 SL Technical Reference Manual page 44

Address Description
0021 8259A Interrupt Controller
Initialization Control Word 3 (Slave Device)
Bits 0-2 IDO-2
Bit 0
0
0
0
0
1
1
1
1
Bit 1
0
0
1
1
0
0
1
1
Bit 2
-
Slave ID
#
0 0
1
1
0 2
1 3
0 4
1 5
0 6
1 7
Bits 3-7
0
(Not Used)
Initialization Control Word 4
Bit 0 Type Of Processor
0 MCS-80/85 Mode
1 8086/8088/80286 Mode
Bit 1 Type of End of Interrupt
0
Normal
EO1
1 Auto EO1
Bits 2-3 Buffering Mode
Bit 3 Bit 2
0 X Non-Buf f ered Mode
1 0 Buffered Mode/Slave
1 1 Buffered Mode/Master
Bit 4 Nesting Mode
0 Not Special Fully Nested Mode
1 Special Fully Nested Mode
Bit5-7 0 (Not Used)
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