Table of Contents
Advertisement
inter
iSBC® 80/30 SINGLE BOARD COMPUTER
System Clock (8085A CPU)
2.76 MHz ±0.1%
Auxiliary Power
An auxiliary power bus is provided to allow separate
power to RAM for systems requiring battery backup
of read/write memory. Selection of this auxiliary
RAM power bus is made via jumpers on the board.
Connectors
Interface
Pins Centers
Mating Connectors
(qty)
(in.)
Bus
86
0.156
Viking 2KH43/9AMK12
Parallel I/O
50
0.1
3M 3415-000
Serial I/O
26
0.1
3M 3462-000
Memory Protect
An active-low TTL compatible memory protect signal
is brought out on the auxiliary connector which,
when asserted, disables read/write access to RAM
memory on the board. This input is provided for the
protection of RAM contents during system power-
down sequences.
Line Drivers and Terminators
I/O Drivers: The following line drivers are all com-
patible with the
110 driver sockets on the iSBC
80/30.
Output Frequencies/Timing Intervals
Driver
Characteristics
Sink Current (rnA)
7438
I,OC
48
7437
I
48
7432
NI
16
7426
I,OC
16
7409
NI,OC
16
7408
NI
16
7403
I,OC
16
7400
I
16
NOTE:
I
=
inverting; NI
=
non-inverting; OC
=
open collector
Port 1 of the 8255A has 20 mA totem-pole bidirec-
tional drivers and 1 kO terminators.
110 Terminators: 2200/3300 divider or 1 kO pullup
2200
OPTION 1
2201l/3::~~~~~~~:3...,~;",,0~""'~-~_-~~:
..
1 __
0
1 kll
OPTION 2
1 kll
+5V - - - - - - . .. M ....
..------o
Bus Drivers
Function
Characteristic
Data
Tri-State
Address
Tri-State
Commands
Tri-State
Physical Characteristics
Width:
12.00 in. (30.48 cm)
Height: 6.75 in. (17.15 cm)
Depth: 0.50 in. (1.27 cm)
Weight: 18 oz. (509.6 gm)
280219-3
Sink Current (rnA)
50
50
32
Single Timer/
Dual Timer/Counter
Function
Counter
(Two Timers Cascaded)
Min
Max
Min
Max
Real-Time Interrupt
1.63 p..s
427.1 ms
3.26 p..s
466.50 min
Programmable One-Shot
1.63 p..s
427.1 ms
3.26 p..s
466.50 min
Rate Generator
2.342 Hz
613.5 kHz
0.000036 Hz
306.8 kHz
Square-Wave Rate Generator
2.342 Hz
613.5 kHz
0.000036 Hz
306.8 kHz
Software Triggered Strobe
1.63 p..s
427.1 ms
3.26 p..s
466.50 min
Hardware Triggered Strobe
1.63 p..s
427.1 ms
3.26 p..s
466.50 min
3-33
Advertisement
Table of Contents
