15 Jul
2020
15 Jul
'20
6:18 a.m.
On 2020-07-15 1:51 a.m., Tom Hunter via cctalk wrote:
I have been working on CDC CYBER 170 mainframes
between 1977 and 1988. ...
For many years I have been trying to find one of these vector drawn CC545
consoles to use with my emulator but I haven't been able to find one.
Recently I decided to build a clone of it myself. Bitsavers has a hardware
manual with schematics:
http://www.bitsavers.org/pdf/cdc/cyber/cyber_170/62952600L_CYBER_170_Displa…
The CC545 console achieved unusually fast deflection with an
electromagnetically deflected CRT. I am trying to understand the tricks
they used to get these high speeds. Part of the magic is a dual-yoke which
provided gross positioning within 2 microseconds to anywhere on the screen
Philco READ system (and probably others) did this as well.
http://www.bitsavers.org/pdf/philco/displays/READ_Theory_And_Operation_Feb6…
--Toby
using the first yoke (this is VERY fast) and then
painted the character
using a second yoke around that base position with 0.1 microsecond per
stroke (this is VERY fast too). The two yokes work in an additive manner.
...
Tom Hunter