UNIBUS
E739753
UNIBUS is a pioneering computer bus architecture developed for Digital Equipment Corporation’s PDP series that unified memory and peripheral communications on a single shared system bus.
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
computer bus architecture
ⓘ
system bus ⓘ |
| addressingModel | word-addressed ⓘ |
| addressSpaceType | shared address space for memory and I/O devices ⓘ |
| addressWidth | 18-bit ⓘ |
| allows |
CPU upgrades via bus-compatible processors
ⓘ
multiple memory modules ⓘ plug-in peripheral controllers ⓘ |
| architectureType | asynchronous bus ⓘ |
| busArbitration | distributed arbitration ⓘ |
| connectorType | edge connector ⓘ |
| dataTransferMode | word transfers ⓘ |
| dataWidth | 16-bit ⓘ |
| designGoal |
provide a single shared bus for CPU, memory, and I/O
ⓘ
reduce interface complexity ⓘ simplify system expansion ⓘ |
| developer | Digital Equipment Corporation NERFINISHED ⓘ |
| era | late 1960s ⓘ |
| historicalSignificance | early example of a unified system bus architecture ⓘ |
| influenced | later minicomputer bus designs ⓘ |
| introducedBy | Digital Equipment Corporation NERFINISHED ⓘ |
| introducedInDecSystem | PDP-11/20 NERFINISHED ⓘ |
| manufacturer | Digital Equipment Corporation NERFINISHED ⓘ |
| market | minicomputers ⓘ |
| notableFeature |
device registers mapped into CPU address space
ⓘ
same bus protocol for memory and I/O devices ⓘ |
| purpose | unify memory and peripheral communications ⓘ |
| replacedBy | Q-bus NERFINISHED ⓘ |
| replacedInProductLine | later PDP-11 models ⓘ |
| signalLines |
address lines
ⓘ
arbitration lines ⓘ control lines ⓘ data lines ⓘ |
| supports |
direct memory access
ⓘ
interrupts ⓘ memory-mapped I/O ⓘ multiple bus masters ⓘ vector interrupts ⓘ |
| topology | backplane bus ⓘ |
| usedFor |
connecting CPU to disk controllers
ⓘ
connecting CPU to main memory ⓘ connecting CPU to network interfaces ⓘ connecting CPU to tape drives ⓘ connecting CPU to terminal interfaces ⓘ |
| usedIn |
PDP-10
NERFINISHED
ⓘ
PDP-11 NERFINISHED ⓘ PDP-15 NERFINISHED ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.