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Front Cover
The IMSAI 8080
Features
Systems
Components
Memory
Multiprocessors
Input/Output
Peripherals
Software
Configurations 		OUTSTANDING HARDWARE FEATURES

Front Panel

bulletHandsome and functional, with sharp, readable legends behind acrylic panel
bulletAll indicators long-life LED’s .. . panel filter enhances contrast
bulletEight extra LED’s programmed as an output port
bulletEasy-to-use paddle handle switches
bulletEasily customized for private labeling

Mechanical

bullet Sturdy card-cage construction... holds up to 22 cards
bullet Straight-through backplane design... no special-purpose slots
bullet Short backplane sections available
bullet Flat cable interconnections throughout
bullet Absolute minimum of point-to-point wiring. . . no point-to-point wiring to front panel permits easy panel removal
bullet Rack-mount cabinet available
bullet Pc boards double-sided with plated-through holes and solder mask
bullet Pc boards of glass-fiber reinforced epoxy laminate
bullet Pc board contact fingers gold-plated over nickel

Electrical

bulletFront panel Circuits make one-shot timing links non-critical
bullet Latest LSI and MSI components minimizes package count
bullet Heavy-current tn-state bus drivers

Power Supply

bulletHeavy-duty supply.. . 28 amperes for system expansion
bulletPower regulated on-board by IC devices with thermal current limits

Generous ceramic disk power decoupling capacitors ... dipped tantalum capacitors for board decoupling

System

bulletDesigned from the beginning for multiprocessor, shared memory capability

Software drivers available for all IMSAI 8080 peripherals

SPECIFICATIONS

Processor
Intel 8080A

Memory (directly addressable):
65,536 words

Word Size: One byte (8 bits)

Register Instruction Cycle Time:
2 microseconds

Basic Machine Cycle Time:
0.5 microsecond

Number of Input/Output Ports: 256 Machine Instruction Set: 78 basic instructions, 174 including variants

Nested Subroutine Calls: Number limited only by memory size

Interrupts: Eight hardware levels
(with optional PIC-8 board)

Registers: Six plus stack pointer, program counter, accumulator and status register

Memory Type: Semiconductor (1K x 1 bit chips)

Cabinet

Custom aluminum case with acrylic front panel

Dimensions: 19 1/2 in. wide, 17 in. deep, 7 in. high (rack mount option available)

Front Panel Switches: Paddle handle

Power

Requirements: 120V, 50-60 Hz, single phase, less than 50 Watts (basic system)

Maximum Power Capability: Up to 500 Watts in a large system

Interconnections

Back panel accommodates ten EIA-type 25-pin connectors. Opening and cable clamp furnished for flat cables to exit from cabinet. Flat cables used throughout.


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When PCs Were Micros - Bits and pieces of history about the "good" old days of microcomputers
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