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IBM 5150 Hardware Reference Manual

IBM 5150
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Table
6.
6845 Register Description
ADDR
REG.
REGISTER
40x25
80x25
GRAPHIC
REG.
#
TYPE
UNITS
I/O
ALPHA
ALPHA
MODES
0
RO
Horizontal
Char.
Write
38
71
38
Total
Only
1
R1
Horizontal
Char.
Write
28
50
28
Displayed
Only
2
R2
Horiz.
Sync
Char.
Write
20
5A
20
Position
Only
3
R3
Horiz.
Sync
Char.
Write
OA
OA
OA
Width
Only
4
R4
Vertical
Total
Char.
Write
1F
1F
7F
Row
Only
5
R5
Vertical
Total
Scan
Write
06
06
06
Adjust
Line
Only
6
R6
Vertical
Char.
Write
19
19
64
Displayed
Row
Only
7
R7
Vert.
Sync
Char.
Write
1C 1C
70
Position
Row
Only
8
R8
I
nterlace
Mode
-
Write
02
02
02
Only
9
R9
Max
Scan
Scan
Write
07
07
01
Line
Addr.
Line
Only
A
R10
Cursor
Start
Scan
Write
06
06
06
Line
Only
B
R11
Cursor
End
Scan
Write
07
07
07
Line
Only
C
R12
Start
Addr.
(HI
-
Write
00
00
00
Only
0
R13
Start
Addr.
(Ll
-
Write
00 00
00
E
R14
Cursor
-
Only
Read/
XX
XX
XX
Addr.
(HI
Write
F
R15
Cursor
-
Read/
XX XX
XX
Addr.
(Ll
Write
10
R16
Light
Pen
(HI
-
Read
XX
XX
XX
Only
11
R17
Light
Pen
(Ll
-
Read
XX
XX
XX
Only
Note: All register values are given in hexadecimal.
2-56

Table of Contents

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IBM 5150 Specifications

General IconGeneral
ProcessorIntel 8088
Clock Speed4.77 MHz
RAM16 KB - 256 KB
ManufacturerIBM
Model5150
Release Year1981
Storage5.25-inch floppy drives
GraphicsMDA or CGA
Operating SystemIBM PC DOS
PortsCassette, keyboard
Expansion Slots5

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