Rhode Island Computer Museum Computer Crypt

RICM Online Computer Crypt - DEC PDP-11/45

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.

System-A CPU Chassis

System-A Expansion Chassis

	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 Jumper Cable		M7846 RX11 Floppy Controller
27
28	M9202 UNIBUS Jumper Cable		M7856 DL11-W SLU & realtime clock
29
30
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		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 Jumper Cable		M7846 RX11 Floppy Controller
27
28	M9202 UNIBUS Jumper Cable		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 page was last modified on 8/1/2004.