Here is an old video switcher. Can either do a sequential switch between the 4 inputs, or do a composite of all 4 inputs on a single screen.
IMG_1289 by
SeanB_ZA, on Flickr
The front panel with the whole 2 controls.
IMG_1290 by
SeanB_ZA, on Flickr
Inside, with the SMPS on the left and the big board doing the heavy lifting.
IMG_1292 by
SeanB_ZA, on Flickr
Heavy video work done by 2 Rockwell 6545 CRT controllers.
IMG_1293 by
SeanB_ZA, on Flickr
A whole lot of DRAM, 24k in total.......
IMG_1294 by
SeanB_ZA, on Flickr
The brains of the operation, Genuine Intel 8031.
Operation was to give about 1 update every 2 seconds, or to show a full screen of a single channel at about 1Hz. Picture would be monochrome, even with a colour input it gave no colour info out, just a greyscale and limited scale at that.
