Tandy 1000 Technical Reference Manual

Tandy 1000
Address
8
0080
0081
0082
0083
0084
0085
0086
0087
0088
0089
008A
008B
008C
008D
008E
008F
Technical Reference Manual
Description
DMA Page Reg. (Not Used)
DMA Page
Reg. (Ch 2)
DMA Page Reg. (Ch 3)
DMA Page Reg. (Ch 0, 1)
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
0081 - WRITE ONLY
Address
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Description
DMA Ch 2 Address A16
DMA
Ch 2 Address A 17
DMA Ch 2 Address A18
DMA
Ch 2 Address A19
Not used
Not used
Not used
Not used
0082 - WRITE ONLY
Address Description
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
DMA
Ch 3 Address A16
DMA
Ch 3 Address A17
DMA
Ch 3 Address A 18
DMA Ch 3 Address A19
Not used
Not used
Not used
Not used
6. A3 - A 15 are used to generate the chip select for the page register. The DMA is optional.
Detailed Memory Map--Continued
63

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