Tandy 1000 Technical Reference Manual

B01 - Ground
B02 -
RESET
B03 - +5 VDC
B04 -IR2
B05 - (- 5 VDC)
B06 - FDCDMARO *
B07 -
-12 VDC
B08 - AUDIOIN
B09 - +
12 VDC
B10 - Ground
B11 - MEMW*
B12 - MEMR*
B13
-IOW*
B14 -IOR*
B15 - (DACK3 *)
B16 - (DRQ3*)
B17 - (DACK1
*)
B18 - (DRQ1 *)
B19 - REFRESH*
B20 -
ClK
B21 - RFSHRQ
B22 - BREQ*
B23
-IR5
B24 -IR4
B25 -IR3
B26 - FDCDACK *
B27 - DMATC
B28 - ALE
B29 -
+5 VDC
B30 - OSC
B31 - Ground
Tandy 1000
J7 - DC POWER
(9-PIN VERTICAL HEADER)
1
+5 VDC
3 +5 VDC
5 Ground
7 Ground
9 +
12 VDC
J8,J9,J10 - Expansion Interface Connectors
(Dual 31-Pin Card Edge)
A01 - NMI
A02 -
07
A03 - 06
A04 - 05
A05 - 04
A06 - 03
A07 - 02
A08 - 01
A09 - 01
A10 - READY
A11 - AEN
A12 - A19
A13 - A18
A14
-A17
A15 -A16
A16 - A15
A17
-A14
A18 - A13
A19 - A12
A20 -
A11
A21
- A10
A22 - A09
A23 - A08
A24 - A07
A25 - A06
A26 - A05
A27 - A04
A28 - A03
A29 - A02
A30 -
A01
A31 - AOO
2
4
6
8
Technical Reference Manual
+5 VDC
Ground
Ground
-12 VDC
Note: Signals in parentheses on J8, J9, and J10 are shown for PC Com-
patible Reference only and are not used
on the main logic board of the
Tandy 1000.
8

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