Tandy 1000 Technical Reference Manual

Tandy 1000
iAPX 88/10
A.C. CHARACTERISTICS
MAX MODE SYSTEM (USING 8288 BUS CONTROllER)
TIMING REQUIREMENTS
Technical Reference Manual
-
8088 8088·2
Symbol Parameter Min. Max.
Min. Max.
Units Test Conditions
TClCl
ClK Cycle Period 200
500
125 500 ns
TClCH ClK low Time
(2!JTClCL)-15
(2/.JTCLCL)-15 ns
TCHCL CLK High
Time ('13 TCLCL)+2
(113 TCLCL) +2
ns
TCH1CH2 CLK Rise
Time
10
10 ns
From 1.0V to 3.5V
TCL2CL1 CLK Fall
Time 10 10 ns From 3.5V to 1.0V
TDVCL Data In
Setup Time 30 20
ns
TCLDX Data In
Hold Time
10 10
ns
TR1VCL
RDY
Setup Time into B2B4
35 35 ns
(See Notes
1, 2)
TCLR1X
RDY Hold
Time into B2B4
0 0 ns
(See Notes 1, 2)
TRYHCH
READY
Setup Time into
(213 TCLCL)-15 (2!JTCLCL)-15
ns
BOBB
TCHRYX READY Hold Time into BOBB 30 20 ns
TRYLCL
READY Inactive
to CLK (See
-B -8
ns
Note 4)
Setup Time for Recognition
TINVCH (INTR, NMI, TEST) 30 15 ns
(See Note
2)
TGVCH RQ/GT Setup Time 30 15 ns
TCHGX
RQ Hold Time into BOB6 40
30 ns
TlliH
Input Rise Time
20 20 ns
From 0.8V
to 2.0V
(Except CLK)
TIHIL
Input Fall Time (Except CLK) 12 12 ns
From 2.0V
to 0.8V
NOTES:
1. Signal at B264 or 6266 shown for reference only.
2. Setup requir~ment for asynchronous signal only to guarantee recognition at next eLK.
3. Applies only 10 T2 state (6 ns into T3 state).
4. Applies only to T2 stale (6 ns into T3 state).
AFN-Q0826C

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