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In the system block diagrams, each block connected to the S-100 bus represents
an IMS circuit board.
The actual bus is contained in the motherboard.
Numbers and abbreviations are used to identify each board.
Board
Number
451
645
971
881
465
961
444
631
480
740
861
431
930
820
662
Abbreviation
CPU-A
CPU-B
ZPUjIO
8088ZPU
64DRAM
256DRAM
SPIO
SPIO-B
4SIO
MPU
MPU
FDC
FDC
HOC
VDB
Description
2-80 Processor Board
2-80 Processor Board
2-80 Processor Board
8088 Processor Board (16 bit)
Memory-64K
Memory-256K (for 16 bit systems)
Input/Output (2 serial, 3 8-bit parallel ports)
Input/Output (2 serial, 3 8-bit parallel ports)
Input/Output (4 serial ports)
2-80 Multiprocessor Board
2-80 Multiprocessor Board
5" Floppy Disk Drive Controller Board
5" or 8" Floppy Drive Controller Board
Winchester Disk Controller Board
Video Display Board (5000 IS only)
The last digit in the board number indicates the reV1S10n level.
For example, a
444 I/O board is the same as a 440 I/O board except for a few minor changes.
Different combinations of boards may be used to make up a system.
The mos t
common are listed below.
C£lL
.lLQ.
Memory
451
444
465
645
631
465
645
480
465
--971--
465
2.1
MOTHERBOARD
The motherboard is the board which holds all the other boards.
It provides
power and communication signals.
The protocol used for the signals is based on
the S-100/IEEE696 standard.
IMS motherboards are not slot dependent; any
card can go into any slot.
Generally, the boards are spread out to provide
ventilation between them.
The only reason
you
might put a card in one place and
not another is the cabling considerations; other than that, you may move a card
anywhere you want.
IMS 5000 systems have two sizes of motherboards; the
5000 IS motherboard has 8 slots and the 5000 SX has 12.
IMS International
5000 Series Microcomputers/?O 1.8 3/page ?
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