Tandy 1000 Technical Reference Manual

Tandy 1000
Technical Reference Manual
A.C. CHARACTERISTICS (Continued)
TIMING RESPONSES
iAPX 88/10
8088 8088·2
Symbol
Parameter Min. Max. Min.
Max. Units
Test Conditions
TCLAV
Address Valid Delay 10 110 10
60 ns
TCLAX
Address Hold Time
10 10
ns
TCLAZ Address Float Delay
TCLAX 80 TCLAX 50
ns
TLHLL ALE Width
TCLCH-20
TCLCH-10
ns
TCLLH ALE Active Delay
80 50
ns
TCHLL ALE
Inactive Delay 85
55 ns
TLLAX
Address Hold Time to
TCHCL-10
TCHCL-10
ALE Inactive
ns
TCLDV Data Valid Delay 10 110
10 60 ns
CL = 20-100 pF for
TCHDX Data Hold Time 10
10
ns
all 8088
Outputs
in addition to
TWHDX
Data
Hold Time After WR TCLCH-30 TCLCH-30
ns
internal loads
TCVCTV Control Active Delay 1
10
110 10
70 ns
TCHCTV
Control Active Delay 2 10 110 10 60
ns
TCVCTX
Control Inactive Delay
10
110 10
70 ns
TAZRL
Address Float
to READ
0 0
Active
ns
TCLRL
RD Active Delay 10 165 10 100 ns
TCLRH
RD Inactive Delay
10
150 10 80
ns
TRHAV
RD Inactive to Next
TCLCL-45
TCLCL-40
Address Active
ns
TCLHAV
HLDAValid Delay
10
160 10
100
ns
TRLRH
RDWidth 2TCLCL-75 2TCLCL-50
ns
TWLWH
WRWidth 2TCLCL-60 2TCLCL-40
ns
TAVAL
Address Valid to ALE Low TCLCH-60
TCLCH-40
ns
TOLOH
Output Rise Time 20 20 ns From 0.8V to 2.0V
TOHOL
Output Fall Time 12 12
ns From 2.0V
to 0.8V
A.C. TESTING INPUT, OUTPUT WAVEFORM
A.C. TESTING LOAD CIRCUIT
24~5. .'.~
045--.1\-------~~
rC' lOOp'
C
1
INCLUDES JIG CAPACITANCE
AFN-ooa26C

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