Unibus
E697041
Unibus is a classic computer bus architecture developed by Digital Equipment Corporation for its PDP-11 minicomputers, enabling communication between the CPU, memory, and peripherals over a single shared pathway.
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
bus architecture
ⓘ
computer bus ⓘ |
| addressSpace |
128 kilobytes
ⓘ
256 kilowords ⓘ |
| addressWidth | 18-bit ⓘ |
| architectureType | shared bus ⓘ |
| connects |
central processing unit
ⓘ
controllers ⓘ main memory ⓘ peripheral devices ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| dataWidth | 16-bit ⓘ |
| designGoal | unify I/O and memory access on a single bus ⓘ |
| developer | Digital Equipment Corporation NERFINISHED ⓘ |
| era |
1970s
ⓘ
late 1960s ⓘ |
| hasFeature |
arbitration logic
ⓘ
bus grant lines ⓘ bus request lines ⓘ byte and word transfers ⓘ master-slave protocol ⓘ separate control, address, and data lines ⓘ |
| influenced |
Q-bus
NERFINISHED
ⓘ
later DEC bus designs ⓘ |
| introducedBy | Digital Equipment Corporation NERFINISHED ⓘ |
| introducedInProductLine | PDP-11 NERFINISHED ⓘ |
| manufacturer | Digital Equipment Corporation NERFINISHED ⓘ |
| marketedAs | UNIBUS NERFINISHED ⓘ |
| notableFor |
simplicity of interface for third-party peripherals
ⓘ
unifying memory and I/O on one bus ⓘ |
| replacedBy |
Massbus in some DEC systems
ⓘ
Q-bus NERFINISHED ⓘ |
| signalType | asynchronous ⓘ |
| supports |
CPU-memory communication
ⓘ
CPU-peripheral communication ⓘ direct memory access ⓘ interrupts ⓘ memory-mapped I/O ⓘ memory-peripheral communication ⓘ vector interrupts ⓘ |
| usedFor | minicomputers ⓘ |
| usedIn |
PDP-11
NERFINISHED
ⓘ
PDP-11 minicomputer family NERFINISHED ⓘ PDP-11/20 NERFINISHED ⓘ PDP-11/45 NERFINISHED ⓘ PDP-11/70 NERFINISHED ⓘ VAX-11/780 NERFINISHED ⓘ early VAX systems ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.