Tandy 1000 Technical Reference Manual

Tandy 1000
Detailed Memory Map
Address
1
0000
0001
0002
0003
0004
0005
0006
0007
0008
0009
OOOA
0008
OOOC
0000
OOOE
OOOF
Address
2
0020
0021
0022
0023
0024
0025
0026
0027
0028
0029
002A
0028
002C
0020
002E
002F
Technical Reference Manual
Description
8237
A-5 DMA Controller
8237
A-5 DMA Controller
8237A-5
DMA Controller
8237
A-5 DMA Controller
8237
A-5 DMA Controller
8237A-5 DMA Controller
8237A-5 DMA Controller
8237
A-5 DMA Controller
8237A-5 DMA Controller
8237A-5 DMA Controller
8237A-5 DMA Controller
8237
A-5 DMA Controller
8237
A-5 DMA Controller
8237
A-5 DMA Controller
8237A-5 DMA Controller
8237A-5 DMA Controller
Description
8259A Interrupt Controller
8259A Interrupt Controller
8259A Interrupt Controller
8259A Interrupt Controller
8259A Interrupt Controller
8259A Interrupt Controller
8259A Interrupt Controller
8259A Interrupt Controller
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
1. A4 - A15 are used to generate the chip select for the 8237A-5. AO, A1, A2, A3 are connected
directly to the 8237A-5. The assigned addresses are 0000 -
OOOF. The DMA is optional.
2. A3 - A15(8) are used to generate the chip select for the 8259A. AO is decoded directly by the
8259A. The assigned addresses are 0020-0021 (8).
60

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