AGSM Computer Room

Computer room with 4 racks of PDP-11, 2 blue and cream disks

AGSM's PDP-11/70 in it's comparatively new home (just over a year). It had previously had a hard life in AGSM's temporary location in another building, one not designed for a computer. The two disk drives (cream and blue cabinets to the left) were made by CDC (Control Data Corporation) and used removable packs of 300 MB! The disk packs were kept in the blue cylindrical objects sitting on the top, rear of the drive cabinets.

Four section rack of computer equipment; printing terminal in front, bright pin chair

The PDP-11/70. The tape drive on the left was a 1600 bpi unit. The CPU is the part with all the lights on it (which were used for various purposes) and the right hand cabinet had the memory - core memory in those days. I don't recall how much - perhaps 256kB or 512kB.

Computer rack, disk drives and printing terminal

Another view, showing the patch panel in the far corner, to connect the various VDUs in the building to the computer. There's also a 300 baud (yes, 300 baud!) modem sitting on the floor. And a tape rack.

Three unit computer cabinet, gray with blue top, and another single cabinet next to it

The VAX arrived! Quite an upgrade. Apart from being a 32 bit machine, it came with 3 MB (yes, three!) of memory, a 6250 bpi tape unit, and a 600 MB disk, which is only just visible in the lower right hand corner, adjacent to the 2 CDC disks.

More computer room views, from beside tape rack; VAX on right, 11/70 on left

The computer room was getting a little crowded! Fortunately it was well air conditioned, so heat was not normally a problem - except when the air conditioning started having issues at night and shutting down. The PDP-11/70 ended up going to Computer Science department in Electrical Engineering.

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