Tandy 1000 Technical Reference Manual

Tandy 1000
8284A/8284A-1
A.C. CHARACTERISTICS (Continued)
TIMING RESPONSES
Technical Reference Manual
Symbol
Peremeter Min. 8284A Min. 8284A-1 Mex. Unite
T.et Conditione
tCLCL
ClK Cycle Period 125
100
ns
tCHCl
ClK HIGH Time
('I, t
CL
cd +2
39
ns
tCLCH
ClK lOW Time
(~tcLcd-15
53
ns
tCH1CH2
ClK Rise or Fall Time
10 ns 1.0V
to 3.5V
tCl2Cl1
tPHPL
PClK HIGH Time
tCLCL -20 leLCL -20
ns
tPlPH
PClK lOW Time
tCLCL -20
leLCL -20
ns
tFlYLCL
Ready Inactive to ClK (See Note 3)
-B
-8 ns
tAvHCH
Ready Active to ClK (See Note 2)
(~tcLcd-15
53
ns
tCLIL
ClK to Reset Delay 40
ns
tCLPH
ClK to PClK HIGH DELAY
22
ns
tCLPL
ClK to PClK lOW Delay
22 ns
tO
LCH
OSC to ClK HIGH Delay
-5
-5
22
ns
tOLCL
OSC to ClK lOW Delay 2
2 35
ns
tOLOH
Output Rise Time (except ClK)
20
ns From O.BV to 2.0V
tO
HOl
Output Fall Time (except ClK)
12
ns From 2.0V to O.BV
NOTES:
1. Setup and hold necessary only to guarantee recognition at next clock.
2. Applies only to T3 and TW states
3. Applies only to T:;! states.
A.C. TESTING INPUT, OUTPUT WAVEFORM
INPUT/OUTPUT
A.C. TESTING: INPUTS ARE
DAIVEN AT 2.4V FOR A LOGIC "1" AND O.45V
FDA A LOGIC "0." TIMING MEASUREMENTS ARE MADE AT 1.5V FOR
BOTH A LOGIC "1" AND "0." INPUT RISE AND FAll TIMES (MEASURED
BETWEEN O.BV AND 2.0V) ARE 5 ± 2 NS
3-571
A.C. TESTING LOAD CIRCUIT
CL - l00pF FOR ClK
Cl = 30pF FOR READY
AFN-{)1472D

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