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DEC PDP-11/45

DEC PDP-11/45 (built 1972)

S/N 6583 (left), S/N 5270 (right)

On 30-JUL-04 the RICM rescue squad, assisted by Mike Rahamut of Purvis Systems, rescued a pair of PDP-11/45 systems that were part of the Brooklyn, NY fire dispatch system. They were located in an neo-Italian style public building located next to Prospect Park that was built in 1913. The building is soon to be restored so removing the equipment was important. We also rescued 5 cabinets full of electronics that interfaced to the dispatch terminals, and some of the dispatch terminal controllers.

The dispatch system used a pair of 11/45s. System-B originally included a pair of RH11 Massbus disk controllers, a RP04 96 MB disk (maybe 2), and an LP05 printer. System-B has 48KW of MF11-UP core. System-A was upgraded to 128KW of MS11-LD MOS memory. Both systems have two DJ11 (16 Serial Ports), two DV11 (16 Serial Ports with Intelligent Controller), and a DC08 (Telegraph Line Interface). Both systems boot and run RSX11-D and a special application from a single RX01 floppy disk.
 
 The DV11 & DH11 serial controllers can be used with very low baud rates. The DC08 was connected to fire call boxes in buildings and on the street. When someone pulled the handle on a fire call box it released a encoding wheel that sent a unique sequence of pulses to the 11/45. The 11/45 looked up the address that corresponded to the sequence and send a dispatch message to the 911 system.
 
System-A CPU and Unibus Chassis, S/N 6583
Slot AB CD EF
1 M9312 Bootstrap Terminator
2
3
4
5
6
M8100 11/45 DAP Data and Address Path (KB11-A)
7
M8101 11/45 GRA General Register amd Control (KB11-A)
8
M8102 11/45 IRC Instruction and Register Decode (KB11-A)
9
M8103 11/45 RAC ROM and ROM Control (KB11-A)
10
M8104 11/45 PDR Processor Data an Unibus Registers (KB11-A)
11
M8105 11/45 TMC Trap and Miscellaneous Control (KB11-A)
12
M8106 11/45 UBC Unibus and Console Control (KB11-A)
13
M8108 11/45 SSR System Status Registers (KT11-C)
14
M8107 11/45 SAP System Address Path (KT11-C)
15
M8109 11/45 TIG Timing Generator (KB11-A)
16
17
18
19
20
21
22
23
24
25
26 M9202 UNIBUS A Jumper Cable M7846 RX11 Floppy Controller
27 M9202 UNIBUS A Jumper Cable
28 M9202 UNIBUS B Jumper Cable
M7856 DL11-W SLU & realtime clock
29
30 M9202 UNIBUS B Jumper Cable
31
32 M7891-DA 128-Kword 18-bit parity MOS memory
33
34
35
36 UNIBUS Cable

There are two Expansion Chassis in this system. One was not connected and was missing the power supplies.

System-A Expansion Chassis
Slot AB CD EF
1
2
3
4
5
6
7
8
9
10
11             UNIBUS Cable
M105 Address Selector Module
M7821 Interrupt Control
M 7279 DH11 FIFO buffer
12 M7285 MUX Control Board
13
M5900 16-channel TTL receiver
M7280 8 UARTS on quad-height board
14
M920 UNIBUS Jumper Cable
M7280 8 UARTS on quad-height board
15
16
M920 UNIBUS Jumper Cable
M105 Address Selector Module
M7821 Interrupt Control
M 7279 DH11 FIFO buffer
17
M7285 MUX Control Board
18
M7280 8 UARTS on quad-height board
19 M920 UNIBUS Jumper Cable
M7280 8 UARTS on quad-height board
20
21
M920 UNIBUS Jumper Cable
M7807 Bus control and MUX for DV11
22
M7836 ALU and Transfer Bus for DV11
23
M7837 UNIBUS Data and NPR Control for DV11
24
M7838 ROM, RAM and Branch for DV11
25
M7833 Line card, 4 Async Lines for DV11
26
M7833 Line card, 4 Async Lines for DV11
27 M7833 Line card, 4 Async Lines for DV11
28 M7833 Line card, 4 Async Lines for DV11
29 M920 UNIBUS Jumper Cable M7808 Modem control scan and MUX for DV11
30
31 M920 UNIBUS Jumper Cable M7807 Bus control and MUX for DV11
32
M7836 ALU and Transfer Bus for DV11
33
M7837 UNIBUS Data and NPR Control for DV11
34
M7838 ROM, RAM and Branch for DV11
35
M7833 Line card, 4 Async Lines for DV11
36
M7833 Line card, 4 Async Lines for DV11
36
38
39 Unibus Terminator M7808 Modem control scan and MUX for DV11
System-B CPU and Unibus Chassis, S/N 5270
Slot AB CD EF
1 M9312 Bootstrap Terminator
2
3
4
5
6
M8100 11/45 DAP Data and Address Path (KB11-A)
7
M8101 11/45 GRA General Register amd Control (KB11-A)
8
M8102 11/45 IRC Instruction and Register Decode (KB11-A)
9
M8103 11/45 RAC ROM and ROM Control (KB11-A)
10
M8104 11/45 PDR Processor Data an Unibus Registers (KB11-A)
11
M8105 11/45 TMC Trap and Miscellaneous Control (KB11-A)
12
M8106 11/45 UBC Unibus and Console Control (KB11-A)
13
M8108 11/45 SSR System Status Registers (KT11-C)
14
M8107 11/45 SAP System Address Path (KT11-C)
15
M8109 11/45 TIG Timing Generator (KB11-A)
16
17
18
19
20
21
22
23
24
25
26 M9202 UNIBUS A Jumper Cable M7846 RX11 Floppy Controller
27 M9202 UNIBUS B Jumper Cable
28
M7856 DL11-W SLU & realtime clock
29
30 M8293 Timing and Control (MF11-LP)
31 M7259 Parity (MF11-LP)
32 G114 Sense Inhibit (MF11-LP)
33 H217C 16-KW Core Memory Stack (MF11-LP)
34 G235 X-Y Driver (MF11-LP)
35 G235 X-Y Driver (MF11-LP)
36 H217C 16-KW Core Memory Stack (MF11-LP)
37 G114 Sense Inhibit (MF11-LP)
38 UNIBUS Cable M8259 Timing and Control (MF11-LP)

This system originally had two DH-11 Massbus disk controllers where the DV-11s are. There are two Expansion Chassis in this system. One was not connected and was missing the power supplies.

System-B Expansion Chassis
Slot AB CD EF
1 UNIBUS Cable M8293 Timing and Control (MF11-LP)
2 M7259 Parity (MF11-LP)
3 G114 Sense Inhibit (MF11-LP)
4 H217C 16-KW Core Memory Stack (MF11-LP)
5 G235 X-Y Driver (MF11-LP)
6
7
8
9 M9202 UNIBUS Jumper Cable
10
11 M9202 UNIBUS Jumper Cable
M105 Address Selector Module
M7821 Interrupt Control
M 7279 DH11 FIFO buffer
12 M7285 MUX Control Board
13
M5900 16-channel TTL receiver
M7280 8 UARTS on quad-height board
14
M920 UNIBUS Jumper Cable
M7280 8 UARTS on quad-height board
15
16 M9202 UNIBUS Jumper Cable
M105 Address Selector Module
M7821 Interrupt Control
M 7279 DH11 FIFO buffer
17 M7285 MUX Control Board
18
M5900 16-channel TTL receiver
M7280 8 UARTS on quad-height board
19
M920 UNIBUS Jumper Cable
M7280 8 UARTS on quad-height board
20
21
M920 UNIBUS Jumper Cable
M7807 Bus control and MUX for DV11
22
M7836 ALU and Transfer Bus for DV11
23
M7837 UNIBUS Data and NPR Control for DV11
24
M7838 ROM, RAM and Branch for DV11
25
M7833 Line card, 4 Async Lines for DV11
26
M7833 Line card, 4 Async Lines for DV11
27 M7833 Line card, 4 Async Lines for DV11
28 M7833 Line card, 4 Async Lines for DV11
29 M920 UNIBUS Jumper Cable M7808 Modem control scan and MUX for DV11
30
31 M920 UNIBUS Jumper Cable M7807 Bus control and MUX for DV11
32
M7836 ALU and Transfer Bus for DV11
33
M7837 UNIBUS Data and NPR Control for DV11
34
M7838 ROM, RAM and Branch for DV11
35
M7833 Line card, 4 Async Lines for DV11
36
M7833 Line card, 4 Async Lines for DV11
36
38
39 Unibus Terminator M7808 Modem control scan and MUX for DV11
 
This is what the whole system looked like when it was installed. The cabinets to the right of the processor cabinets contain all of the cable I/O. The cabinets to the left of the processor cabinets contain the DV11 & DH11 serial controllers with DC08 telegraph interface electronics.
 
This plaque was on the outside of the building that housed the PDP-11/45 systems. 
 
System-A CPU Chassis
 
System-A Expansion Chassis
 
 
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