Standards in microcomputer system design

Abstract

The subject of standards should concern all those who design or use microcomputer systems. Interface standards are of prime concern, particularly internal bus standards. The S100 bus dominates the personal computer market, but it has serious drawbacks and other buses are being considered.

Instrumentation buses for microcomputers present problems of cost and manufacturer support. CAMAC is a well supported system, but in its parallel form is probably too expensive for most microcomputers. The IEE-488-75 bus is already available and is well supported.

Communications interfaces on microcomputers owe everything to minicomputer and mainframe systems. The ubiquitous RS-232-C has been improved in the specifications RS-422/3. Better definition for internal and instrumentation buses are in preparation and offer the hope of easier system design.