Q-bus
E697042
Q-bus is a computer bus architecture developed by Digital Equipment Corporation for its PDP-11 and early VAX systems, providing a cost-effective, multiplexed alternative to the earlier Unibus.
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
computer bus architecture
ⓘ
system bus ⓘ |
| addressSpaceType | shared address and data lines ⓘ |
| architectureFamily | DEC bus architectures ⓘ |
| belongsTo |
PDP-11 architecture ecosystem
NERFINISHED
ⓘ
VAX architecture ecosystem ⓘ |
| compatibleWith | various DEC peripheral controllers ⓘ |
| designedFor |
PDP-11 minicomputers
NERFINISHED
ⓘ
low-cost system configurations ⓘ minicomputers ⓘ |
| developer | Digital Equipment Corporation NERFINISHED ⓘ |
| electricalType | parallel bus ⓘ |
| hasAdvantageOver |
Unibus in board count reduction
ⓘ
Unibus in cost ⓘ Unibus in wiring complexity reduction NERFINISHED ⓘ |
| hasCharacteristic |
cost-effective design
ⓘ
multiplexed bus ⓘ |
| hasFeature |
arbitration for bus mastership
ⓘ
memory-mapped I/O ⓘ vector interrupts ⓘ |
| hasNameVariant | QBUS NERFINISHED ⓘ |
| introducedBy | Digital Equipment Corporation NERFINISHED ⓘ |
| isAlternativeTo | Unibus ⓘ |
| manufacturer | Digital Equipment Corporation NERFINISHED ⓘ |
| marketRole | lower-cost alternative to Unibus-based systems ⓘ |
| replaced | Unibus NERFINISHED ⓘ |
| signalType | multiplexed address/data lines ⓘ |
| supports |
16-bit data paths in many implementations
ⓘ
DMA transfers ⓘ I/O device connections ⓘ byte and word data transfers ⓘ extended addressing in later implementations ⓘ interrupt handling ⓘ memory transfers ⓘ multiple bus masters ⓘ |
| topology | backplane bus ⓘ |
| usedDuring |
1980s
ⓘ
early 1990s ⓘ late 1970s ⓘ |
| usedFor |
connecting CPU, memory, and peripherals
ⓘ
expansion of PDP-11 and VAX systems via plug-in cards ⓘ |
| usedIn |
MicroVAX systems
NERFINISHED
ⓘ
PDP-11 NERFINISHED ⓘ VAX NERFINISHED ⓘ early VAX systems ⓘ embedded and industrial PDP-11 systems ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.