RICM Online Computer Crypt - DEC PDP-11/34a, S/N AG11840

Built 19-AUG-77

This PDP 11/34a was donated by Rich Cini of Syosset, NY, It is a Unibus based 16 bit minicomputer manufactured by Digital Equipment Corporation. It was introduced in 1977 and is an upgraded PDP 11/34. It can have a Cache Memory option and has the Floating Point option added for improved performance. It has memory management and supports a maximum of 256 KBytes of memory.

This machine has 128 KWords of RAM memory, two 2.5 MByte RK05 disk drives, a 10 MByte RL02 disk drive, and a RX02 dual floppy drive. It has the full Programmers Console front panel instead of the simpler Base front panel.

It was originally used by the psychology department at the University of Pennsylvania. It was donated to the RICM by ?.

The 11/34a contains the following boards:

Slot	AB	CD	EF
1	M8266 KD11-EA11/34A control module
2	M8265 KD11-EA11/34A data paths module
3	M8267 FP11-A11/34A floating point processor
4
5	PMSIIL 128KW Memory
6
7	M9312Bootstrap terminator	M7859 KY11-LBConsole interface
8
9	M9202 Unibus Jumper
10
11	M9202 Unibus Jumper	M8256 RX211 RX02 floppy controller
12
13
14
15
16	M7762 RL11 RL01/02 disk drive controller
17
18
19	M9202 UNIBUS Jumper Cable
20
21	M9202 UNIBUS Jumper Cable	M7254 RK11-D RK05 status control module
22	BC05 Cable to RK05 drive	M7255 RK11-D RK05 disk control module
23		M7256 RK11-D RK05 registers module
24	M9302 UNIBUS terminator, far end	M7257 RK11-D RK05 bus control module

This is what the inside of the Unibus chassis looks like:

Note: The RL02 controller was added after the picture was taken.