S-100 bus

E744086

The S-100 bus is an early microcomputer expansion bus standard, originally used in Altair 8800–era systems, that defined a 100-pin edge connector for modular CPU, memory, and peripheral cards.

All labels observed (5)

Label Occurrences
S-100 bus canonical 13
S-100 bus systems 2
Altair bus 1

How this entity was disambiguated

Statements (50)

Predicate Object
instanceOf computer bus standard ⓘ
hardware interface ⓘ
microcomputer expansion bus ⓘ
addressBusWidth 16-bit (originally) ⓘ
24-bit (later IEEE 696) ⓘ
alsoKnownAs Altair bus ⓘ
linked to: S-100 bus

S100 bus ⓘ
linked to: S-100 bus
architecture parallel bus ⓘ
connectorType edge connector ⓘ
controlSignals DMA support (later) ⓘ
interrupt lines ⓘ
separate control lines for memory and I/O ⓘ
dataBusWidth 16-bit (later IEEE 696) ⓘ
8-bit (originally) ⓘ
governedBy IEEE 696 standard ⓘ
linked to: IEEE 696
historicalSignificance one of the first widely adopted microcomputer bus standards ⓘ
influenced later microcomputer bus designs ⓘ
introducedBy MITS ⓘ
introducedInProduct Altair 8800 ⓘ
linked to: MITS Altair 8800
introducedYear 1975 ⓘ
marketRole enabled third-party hardware ecosystem for early microcomputers ⓘ
numberOfPins 100 ⓘ
operatingSystems CP/M ⓘ
CP/M-86 (on later 16-bit systems) ⓘ
linked to: CP/M-86
popularIn 1970s ⓘ
early 1980s ⓘ
predecessorOf later proprietary PC expansion buses ⓘ
regionOfPopularity Europe ⓘ
United States ⓘ
standardizedAs IEEE 696 ⓘ
standardizedYear 1979 ⓘ
supportedCPU Intel 8080 ⓘ
Intel 8085 ⓘ
Intel 8086 (later systems) ⓘ
linked to: Intel 8086

Motorola 68000 (via adapter designs) ⓘ
Zilog Z80 ⓘ
typicalCardFormFactor plug-in board with 100-pin edge connector ⓘ
usedFor CPU cards ⓘ
memory cards ⓘ
microcomputer expansion ⓘ
peripheral interface cards ⓘ
usedIn Altair 8800 ⓘ
linked to: MITS Altair 8800

Cromemco systems ⓘ
linked to: Cromemco

IMSAI 8080 ⓘ
NorthStar Horizon ⓘ
Vector Graphic systems ⓘ
linked to: Vector Graphic

various CP/M computers ⓘ
voltageLevels +16 V ⓘ
+8 V ⓘ
±16 V (later variants) ⓘ

How these facts were elicited

Referenced by (18)

Full triples — surface form annotated when it differs from this entity's canonical label.

Control Program for Microcomputers → usedOn → S-100 bus systems ⓘ
linked to: S-100 bus
IMSAI 8080 → busArchitecture → S-100 bus ⓘ
MP/M → targetHardware → S-100 bus systems ⓘ
linked to: S-100 bus
S-100 bus → alsoKnownAs → S100 bus ⓘ
linked to: S-100 bus
S-100 bus → alsoKnownAs → Altair bus ⓘ
linked to: S-100 bus
Cromemco → usedHardwareStandard → S-100 bus ⓘ
Cromemco → busStandard → S-100 bus ⓘ
CompuPro → usedBusArchitecture → S-100 bus ⓘ
Altair 8800 → expansionBus → S-100 bus ⓘ
subject linked to: MITS
MITS → associatedWith → S-100 bus standard ⓘ
linked to: S-100 bus