Spent the afternoon photographing a PDP-12. Closeup of part of the core memory. #RetroComputing #rcsri

Photographing some stuff for the museum today. Early 80s ram, Xerox Star "Dandetiger". #rcsri #retrocomputing #photography

An example #TECO macro from the "HRSTS TECO MANUAL" 2nd ed, Harvard 1977. #retrocomputing #rcsri #emacs

The boards from a Sun-3/280 server, 1986. (User for scale.)

CPU board - 68020 (includes ethernet)
FDDI
4 x 8meg ram boards
Tape (9-track)
SCSI

#unix #retrocomputing #sunmicrosystems #rcsri

That's quite a span! From 50s vacuum-tube mainframe to 90s massively parallel supercomputer. #fortran #retrocomputing #rcsri

LARGE board, Intergraph, late 80s. This was in a VAX 8550 which had these weird Intergraph disk subsystems which apparently could do searches on features within CAD files without involving the VAX CPU. (Odd: note the wirewrap settings just below the center large chip. Pretty late for that.) #rcsri #retrocomputing

I recently updated the #RCSRI page for our NSFnet backbone router. #retrocomputing

https://rcsri.org/collection/nsfnet-t3/

The Packard Bell "High Speed Buffer" is a device from 1961 that allows data transfer between devices of different speeds. (In this case, a PB-250 minicomputer and various A/D, D/A, etc.)

It's a 3U 19" rack box that weighs 25 pounds.

It stores 22 bits.

TWENTY. TWO.

Almost 3 bytes. (But not quite.)

Those SR-100 shift register boards down the center store 2 bits apiece.

More info on the buffer & the system it was part of here:

https://rcsri.org/collection/pb-250/

#retrocomputing #rcsri

#Spacewar on a #PDP12. Sort of a casual shot in preparation for getting a really good shot sometime soon.

#retrocomputing #rcsri

Updating our computer museum web site. Here's our Teletype with an external answerback unit (a 20-byte electromechanical rom) and a Bell 101 (the first modem ever commercially available):

#rcsri #retrocomputing

https://rcsri.org/collection/asr-33-bell-101/

Spending the weekend photographing a Bell 101, the first modem ever commercially available. This one is embedded in the base of an ASR33 Teletype. #cats for scale. (Yes, that entire slide-out unit is a modem.) #retrocomputing #rcsri

This is the best photo of magnetic core memory I've ever taken. IBM, early 60s. Shot with a microscope lens mounted on a 35mm B&W digital camera. No post! (I got into the habit of never doing any post-processing while documenting historic artifacts for the museum. Photoshop not allowed!) #retrocomputing #photography #rcsri

I used this shot for the cover of my book of images from our museum:

https://www.amazon.com/Inside-Machines-Dave-Fischer/dp/B09X557N52

Browsing some #PDP12 docs. La la la. #retrocomputing #rcsri

I've taken a LOT of photographs of core over the years. This is the closest shot I've ever managed to get. #retrocomputing #rcsri #photography

The PB-250 (22-bit minicomputer, 1960) didn't have much of a front panel. To make up for that, it had a bunch of sockets to connect your oscilloscope probes, and instructions for how to configure your scope to view the internal registers. #retrocomputing #rcsri