The VAX-11/780 was DEC's first 32-bit minicomputer, introduced in
1978. The 11/785 was the same design, with an increased system
clock, introduced in 1984.
| Manufacturer |
Digital Equipment Corporation
|
| Model |
VAX-11/785
|
| Classification |
Minicomputer
|
| Introduced |
1984
|
| Word Size |
32 bits
|
| Implementation |
TTL ICs
|
| Registers |
16
|
| Logical Address |
32 bits
|
| Physical Address |
?
|
| Memory Type |
MOS
|
Hex-wide boards comprising the CPU:
|
Slot
|
Board
|
Designation
|
Description
|
Comment
|
|
29
|
M7477
|
CIB
|
Console Interface
|
Connection to PDP-11 Frontend
|
|
28
|
M7544
|
FCT
|
Floating Point Accelerator Control
|
FP Optional?
|
|
27
|
M7543
|
FAD
|
Floating Point Fraction Adder
|
|
|
26
|
M7542
|
FML
|
Floating Point Fraction Multiplier (low)
|
|
|
25
|
M7541
|
FMH
|
Floating Point Fraction Multiplier (high)
|
|
|
24
|
M7540
|
FNM
|
Floating Point Fraction Normalizer
|
|
|
23
|
M7476
|
USC
|
Micro Sequencer Control
|
|
|
22
|
|
21
|
|
20
|
M7475
|
JCS
|
Joint Control Store
|
|
|
19
|
|
18
|
M7475
|
JCS
|
Joint Control Store
|
|
|
17
|
|
16
|
M7474
|
CLK
|
CPU Clock
|
(Is this also TODC?)
|
|
15
|
M7473
|
ICL
|
Interrupt Control (low)
|
|
|
14
|
M7472
|
ICH
|
Interrupt Control (high)
|
|
|
13
|
M7471
|
DAP
|
CPU Data Path A
|
|
|
12
|
M7470
|
DCP
|
CPU Data Path C
|
|
|
11
|
M7469
|
DDP
|
CPU Data Path D
|
|
|
10
|
M7468
|
DEP
|
CPU Data Path E
|
|
|
9
|
M7467
|
DBP
|
CPU Data Path B
|
|
|
8
|
M7466
|
IRC
|
CPU Instruction Decode
|
|
|
7
|
M7465
|
IDP
|
CPU Instruction Data Path
|
|
|
6
|
M7464
|
TBM
|
Translation Buffer Matrix
|
MMU
|
|
5
|
M7463
|
CDM
|
Cache Data Matrix
|
|
|
4
|
M7462
|
CAM
|
Cache Address Matrix
|
|
|
3
|
M7461
|
SBH
|
Synchronous Backplane Interface (high)
|
Connection to memory, UNIBUS, MASSBUS, CI controllers.
|
|
2
|
M7460
|
SBL
|
Synchronous Backplane Interface (low)
|
|
|
1
|
M7459
|
TRS
|
Terminator / Silo
|
