IBM XT 5160 User Manual

-
- -
Hex
PAO
+ Keyboard Scan Code 0
Diagnostic Outputs 0
Port
I
1
1
1
Number
N 2 2
2
P
3 3
Or
3
0060
U
4 4 4
T
5 5 5
6
6
6
7 7 7
-
"'"--
-
PBO
+ Timer 2
Gate Speaker
0
1
+ Speaker Data
U
2
Spare
T
3
Read High Switches or Read Low Switches
0061
P 4
-
Enable RAM Parity Check
U
5
-
Enable I/O Channel Check
T
6 - Hold Keyboard Clock
Low
7
-
(Enable Keyboard or + (Clear Keyboard)
PCO Loop on POST
SW~ [[:SPla
y
0
..I.
Sw-5
I 1
+ CoProcessor Installed
Sw-2 Display 1
..I.
Sw-6
N 2
+ Planar RAM Size 0
..I.
Sw-3 Or # Drives
..1...1.
Sw-7
0062 P
3
+ Planar RAM Size 1
..I.
Sw-4 # Drives 1
..1...1.
Sw-8
U
4
Spare
T
5
+ Timer Channel 2 Out
UJJ
+ I/O Channel Check
+ RAM Parity Check
0063
Command/Mode Register Hex
99
Mode Register Value
7
6
5
4
3
2 1 0
1
0 0
1 1
0
0
1
..I.
Sw-4
Sw-3
Amount of
Memory on
System Board - 64/256K
0 0
64K
0
1
128K
1
0
192K
1
1
256K
..I.
Sw-4
Sw-3
Amount of Memory on System Board - 256/640K
0 0
256K
0
1
512K
1
0
576K
1 1
640K
..1...1.
Sw-6
Sw-5
Display at Power-Up Mode
0
0
Reserved
0
1
Color
40 X 25 (BW Mode)
1 0
Color 80 X
25 (BW Mode)
1
1
IBM Monochrome 80 X 25
..1...1...1.
Sw-8
Sw-7 Number of
Diskette
Drives in System
0
0 1
0
1
2
1 0
3
1
1
4
Notes:
PA Bit = 0 implies switch "ON". PA Bit = 1 implies switch "
OFF
".
A plus (+) indicates a bit value of 1 performs the specified function.
A minus (-) indicates a bit value of 0 performs the specified function.
8255A I/O Bit Map
1-28 System Board

IBM XT 5160 Specifications

General

Brand	IBM
Model	XT 5160
Category	Desktop
Language	English