Tandy 1000 Technical Reference Manual

Tandy 1000
U46 System Timing Synthesizer
Code: 46DC
Equations:
Technical Reference Manual
Checksum: 3E69
ALE
DEN*
IOR*
MEMR*
IOW*
MEMW*
IOWAIT
= HLDA . ·CALE
= HLDA . 101M· DT/R . C . INTCS* . SSO (lOR) .
(during lOR *)
--- -
+ HLDA . 101M· DT/R . C . INTCS* . (MEMR) .
(during IOR*)
+ HLDA· B . DT/R· . INTCS* . SSO (MEMW) .
(during IOR*)
+ HLDA . . DT/R . C . INTCS* . SSO (MEMW) .
(during IOR*)
= HLDA . 101M . B . DT/R . SSO*
--- -
= HLDA . 101M . B . DT/R .
= HLDA . 101M . B . DT/R . SSO
--- -
= HLDA . 101M . B . DT/R . SSO
-- -
= HLDA . 101M . A . DT/R . SSO
+ HLDA . 101M· A . DTR
U103 Video Address Decode
Code: 103C
Checksum: 4480
GACS*
STATUS*
MODE*
LPCLR*
LPSET*
PGCLK*
6845CS*
.
lOW· I07SEL * . 6 . 5 . 4 . 3 . 2 . 1 . 0 . MODE *
- ---
+ . lOW· I07SEL * . 6 . 5 . 4 . 3 . 2 . 1 . 0
- --
+ . lOW· I07SEL * . 6 . 5 . 4 . 3 . 2 . 1 . 0 . STATUS*
- -
+ . lOW· I07SEL * . 6 . 5 . 4 . 3 . 2 . 1 . 0
- --
= I07SEL * . 6 . 5 . 4 . 3 . 2 . 1 . 0
- ---
= . lOW· I07SEL * . 6 . 5 . 4 . 3 . 2 . 1 . 0
- - -
= I07SEL * . 6 . 5 . 4 . 3 . 2 . 1 . 0 . lOW
- ---
= I07SEL * . 6 . 5 . 4 . 3 . 2 . 1 . 0 . lOW
- -
= I07SEL * . 6 . 5 . 4 . 3 . 2 . 1 . 0 . lOW
- -
= I07SEL * . 6 . 5 . 4 . 3 .
23

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