Embedded Files
This DECSYSTEM 2020 was donated to the Rhode Island Computer Museum by the University of Massachusetts, Dartmouth (formerly Southeastern Massachusetts University).
The KS10 is the smallest model in the PDP10 family of 36 bit computers manufactured by Digital Equipment Corporation. It was introduced in 1978 as a small low cost version of the KL10. It has 512 Words of Cache Memory and supports a maximum of 512 Kwords (36-bit) of memory. ADP sold a modified version of this system that supported 1024 Kwords of memory.
This machine shipped with 512 KWords of RAM memory, a master and slave pair of TU45 Tape Drives, four RP06 Disk Drives, 32 serial ports, and a LP20 Line Printer interface.
The system had problems with the KS10 chassis power supply and the tape drives. The first problem with the tape drives was defective vacuum switches that detect the position of the tape in the vacuum columns. Replacement switches purchased from World Magnetics. The CPU cabinet and tape drives run on 115VAC 30A circuits. The RP06 disk drives are usually powered by 220VAC 30A three-phase circuits. A disk drive was modified to run on a 220VAC 30A single-phase circuit. The system now has an RM03 disk drive that came from an PDP-11/70. The RM03 is configured for 16-bit data for the PDP-11/70 and needs to be modified to work with 18 bit data for the KS10.
KS10 systems use one or more Unibus chassis for I/O.
The KS10 chassis in the 2020 contains the following boards:
The KS10. The two TU45 two tape drives are to the right. The left TU45 contains the TM03 tape controller. The drive to the left of the CPU is a RM03. The RP06 drive is behind the RM03.
Slot#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21AB
21CD
21EF
22
23
24CD
24EF
25CD
25EF
26CD
27CD
28AB
28CD
29AB
29CD
Module#
M8629
M8629
M8629
M8629
M8629
M8629
M8629
M8629
M8618
M8623
M8622
M8620
M8621
M8619
M8616
M8619
M9014
M7297
M7296
M7295
M7294YA
M5904
M688
M5904
M688
M5904
MG727
M9300
MG727
M9300
MG727
Option
MS10
MS10
MS10
MS10
MS10
MS10
MS10
MS10
MMC
CRM
CRA
DPE
DPM
UBA#3
CSL
UBA#1
RH11
RH11
RH11
RH11
RH11
RH11
RH11
RH11
RH11
RH11
Description
64KW RAM
64KW RAM
64KW RAM
64KW RAM
64KW RAM
64KW RAM
64KW RAM
64KW RAM
Memory Controller
Control RAM
CRAM Address
Data Path Execute
Data Path Memory
Empty
Console
Unibus Adapter
UNIBUS to 3 H854s
MASSBUS Parity Control
MASSBUS Control and Status Register
MASSBUS bus control
MASSBUS data buffer and control
MASSBUS control transceiver
UNIBUS power fail driver
MASSBUS control transceiver
UNIBUS power fail driver
MASSBUS control transceiver
Unibus Grant
UNIBUS terminator
Unibus Grant
UNIBUS terminator
Unibus Grant
The Unibus chassis in the 2020 contains the following boards:
Slot#
1
2
3
4
5
6
7
8
9U
9M
10
11U
11M
11L
12
13
14M
14L
15M
16M
17M
18U
18M
19U
20
21U
22
23
24U
24M
Module#
M9014
empty
empty
empty
M7819
M7819
M7819
M7819
M9202
MG727
empty
M9202
M7297
M7296
M7295
M7294YA
M5904
M6886
M5904
M5904
MG727
M9300
MG727
M9202
empty
M9202
M8586
M8571
M9300
M8585
Option
DZ11-A
DZ11-A
DZ11-A
DZ11-A
RH11
RH11
RH11
RH11
RH11
RH11
RH11
RH11
LP20
LP20
LP20
Description
UNIBUS to 3 H854s
8-line double-buffered async EIA with modem control
8-line double-buffered async EIA with modem control
8-line double-buffered async EIA with modem control
8-line double-buffered async EIA with modem control
Unibus Jumper
Grant
Unibus Jumper
MASSBUS parity control
MASSBUS control and status
MASSBUS bus control
MASSBUS data buffer and control
MASSBUS control transceiver
UNIBUS power fail driver
MASSBUS control transceiver
MASSBUS control transceiver
Grant
UNIBUS terminator
Grant
Unibus Jumper
Unibus Jumper
LP20 control
LP20 Data Path
UNIBUS terminator
LP20 Translation RAM
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