Tandy 1000 Technical Reference Manual

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PROGRAMMING TABLE FOR THE 6845 All Values in Hex (Decimal
Register
40 x 25
80 x 25
Low Res. High Res. 40 x 25
80 x 25 Low Res.
High Res.
Address
Alpha
Alpha Graphics Graphics
Alpha Alpha Graphics Graphics
00 Horizontal Total
38 (56)
71 (113)
38 (56)
71 (113) 38 (56)
71 (113)
38 (56)
71 (113)
01
Horizontal
28 (40) 50 (80)
28 (40) 50 (80)
28 (40) 50 (80) 28 (40) 50 (80)
Displayed
02
Horizontal
20 (45)
5A (90)
20 (45) 5A (90) 2C (44) 58 (88)
2C (44) 58 (88)
Sync Position
03
Horizontal
OA (10) OA (10)
OA (10) OA (10) 08 (8)
10 (16) 08 (8)
10 (16)
Sync Width
04 Vertical Total
1C (28) 1C (28)
7F (127)
3F (63)
1F (31) 1F (31) 7F (127) 3F (63)
05
Vertical
01 (1) 01 (1)
06 (6)
06 (6) 06 (6) 06 (6)
06 (6) 06 (6)
Total Adjust
06
Vertical
19 (25) 19 (25) 64 (100) 32 (50)
19 (25)
19 (25)
64 (100)
32 (50)
Displayed
07
Vertical
1A (26) 1A (26) 70 (112) 38 (56) 1C (28) 1C (28)
70 (112)
38 (56)
Sync Position
08
Interlace Mode
02
(2) 02 (2)
02 (2) 02 (2) 02 (2) 02 (2) 02 (2) 02 (2)
09
Max Scan
08 (8)
08 (8) 01 (1) 03 (3)
07 (7) 07 (7) 01 (1)
03 (3)
Line Address
10
Cursor Start
06
(6) 06 (6) 06 (6) 06 (6) 06 (6) 06 (6) 06 (6) 06 (6)
11
Cursor End
07
(7) 07 (7) 07 (7) 07 (7)
07 (7) 07 (7) 07 (7) 07 (7)
12
Start
00
(0)
00 (0) 00 (0) 00 (0) 00 (0) 00 (0)
00 (0)
00 (0)
Address (HiQh)
13
Start
00 (0) 00 (0) 00 (0)
00 (0) 00 (0) 00 (0) 00 (0)
00 (0)
Address (Low)
Monitor Mode TV Mode
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Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200