14 Facts About S100 bus

The S100 bus was the first industry standard expansion S100 bus for the microcomputer industry.

Power supplied on the S100 bus is bulk unregulated +8 Volt DC and ±16 Volt DC, designed to be regulated on the cards to +5 V, -5 V and +12 V for Intel 8080 CPU IC, ±12 V RS-232 line driver ICs, +12 V for disk drive motors.

The Sol-20 used a variation that had only a single 8-bit S100 bus and used the now-unused pins as signal grounds to reduce electronic noise.

Address S100 bus is 16-bits wide in the initial implementation and later extended to 24-bits wide.

Unassigned lines of the original S100 bus specification were later assigned to support more advanced processors.

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One unassigned line of the S100 bus then was reassigned to support the non-maskable interrupt request.

S100 bus then looked for an inexpensive source of connectors, and he came across a supply of military surplus 100-pin edge connectors.

The 100-pin S100 bus was created by an anonymous draftsman, who selected the connector from a parts catalog and arbitrarily assigned signal names to groups of connector pins.

These companies were forced to refer to the system as the "Altair S100 bus", and wanted another name in order to avoid referring to their competitor when describing their own system.

S100 bus had a beer in his hand and when the plane hit a bump, Melen spilt some the beer on Marsh.

The first symposium on the S100 bus, moderated by Jim Warren, was held November 20, 1976 at Diablo Valley College with a panel consisting of Harry Garland, George Morrow, and Lee Felsenstein.

The success of these computers, which used IBM's own, incompatible S100 bus architecture, cut deeply into the market for S100 bus products.

Banks of S100 bus computers were used, for example, to process the trades at the Chicago Mercantile Exchange; the United States Air Force deployed S100 bus machines for their mission planning systems.

Market for S100 bus products continued to contract through the early 1990s, as IBM-compatible computers became more capable.