On 2022-Apr-01, at 10:52 AM, Chuck Guzis via cctalk wrote:
On 4/1/22 10:27, Paul Koning wrote:
On Apr 1, 2022, at 1:25 PM, Chuck Guzis via
cctalk <cctalk at classiccmp.org> wrote:
Wasn't some of this glass delay line memory used in early raster-scanned
computer video displays?
I don't know about that one, but a delay line is a key component of a PAL (European)
system color TV receiver.
I know that the CRT display controller on the CDC 200 series terminal
(INTERCOM, Export/Import 200 software) used a 10 msec magnetostrictive
delay line.for image storage. Glass would seem to be a more
mechanically robust storage medium.
Later raster terminals used MOS shift register memory.
The STAR-100 stations used a track on the station microdrum for video
CRT monitors would seem like a likely target application for them.
Their higher speed may have worked to advantage to reduce the total memory requirement.
The MOS-shif-register-memory displays typically had two R/W memories: a frame buffer and a
character-line buffer, the line buffer captured one line of characters from the frame
buffer as it cycled by, so it could be rescanned several times for the multiple H-scan
lines forming a character. The higher speed of the glass memories perhaps would have
eliminated the need for the line buffer.