21 Apr
2006
21 Apr
'06
5 p.m.
No core memory, the electron beam writes through a dielectric mesh to the
phosphor coating, leaving a charge on the mesh. If the storage mode is on,
a flood gun illuminates the entire backside of the dielectric, and the
charges on the previously written areas allow more of the electrons through
to the phosphor than on the uncharged areas thereby keeping an image of the
charged area on the screen, and at the same time replentishing the charged
areas on the dielectric mesh. The manual says it can be held 'indefinitely'
but cautions leaving it for more than an hour lest the mesh acquire such a
charge that it could take a day to discharge and recover. It's a strictly
analog regenerative memory.
Patrick
Paxton Hoag wrote:
Does a
'50's Hughes 104D memo-scope storage oscilloscope scope count?
Doesn't that have core memory. My stepmother hand threaded core for
Hughes in the late 1950s and early 60s.
To be on topic the earlest Graphics system I have in my collection
currently would be an Apolo 570. Although I have had lots of earlier
systems go through my hands in the 1990s.
We hauled a truckload back to PDX from the last Calma auction in '88 or '89.
--
Paxton Hoag
Astoria, OR
USA