EasyManuals Logo

Tandy 1000 Technical Reference Manual

Default Icon
497 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #228 background imageLoading...
Page #228 background image
Tandy 1000
Technical Reference Manual
8255A18255A·5
CONTROL
WORD
,,13
D]
06
D~
04
D
3
OJ
01
Do
1,1
0
I 0
I,
[,
1
0
],
I
CONTROL
WOHD
::14
D
7
06
O~
04
0 0 0 0
~'I"I:i"loOI
I -
c I
I
-PCJPC
o
,
f
PS,
PB
O
A
_--
i-~
A--~PA7PAo
0,
l\,_
I -
c i
I
I-
-
BI-
Operating Modes
MODE 1
(Strobed
Input/Output).
This
functional
con-
figuration
provides
a
means
for
transferring
I/O
data
to
or
from
a
specified
port
in
conjunction
with
strobes
or
"handshaking"
signals.
In
mode
1,
port
A
and
Port
B
use
the
lines
on
port
C
to
generate
or
accept
these
"hand-
shaking"
signals.
6-173
-
P8
l
PS
o
Mode 1 Basic
Functional
Definitions'
•
Two
Groups
(Group
A and
Group
BI
•
Each
group contains one
8-bit
data
port
and one
4-bit
control/data
porI.
• The
8-bit
data
port
can
be
either
input
or
output_
Both
inputs
and
outputs
are latched.
• The
4-bit
port
is
used
for
control
and status
of
the
8-bit
data
porI.

Table of Contents

Other manuals for Tandy 1000

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Tandy 1000 and is the answer not in the manual?

Tandy 1000 Specifications

General IconGeneral
ProcessorIntel 8088
Processor Speed4.77 MHz
RAM128 KB (expandable to 640 KB)
Operating SystemMS-DOS 2.11
ManufacturerTandy Corporation
Release Year1984
StorageSingle or double 5.25" floppy disk drive (360 KB), optional hard drive
SoundTandy 3-voice sound
PortsParallel, Serial
GraphicsCGA (Color Graphics Adapter)
Graphics Modes320x200, 640x200

Related product manuals