27 May
2014
27 May
'14
12:50 p.m.
On May 27, 2014, at 3:03 PM, Chuck Guzis <cclist at sydex.com> wrote:
On 05/27/2014 10:08 AM, Richard wrote:
Depends on what you mean by ?buffered?. In a sense, the 6000 series display is buffered ?
the main memory system state it is displaying is the buffer.
If you mean buffered in the sense of a buffer near or in the controller, containing data
that pretty much directly encodes the display primitives, then that doesn?t apply here.
(Well, not unless you?re looking at the ?K display? ? where an application program could
ask for a more or less arbitrary display by supplying something very similar to a ?display
list".)
paul
It's a vector display, just without arbitrary
graphics.
A point of curiosity--who had the first *buffered* graphics display? That is, where the
display contents were continuously refreshed from a memory buffer. In the old days, you
pretty much had to continuously redraw a display, unless you were using something like a
storage tube. The more complex the display, the more flicker involved.
In particular, I recall that the DD60 on a 6000 could flicker something awful if it was
trying to produce a display from CM and ECS transfers were going on--the PP simply
couldn't get sufficient access to CM to regenerate a display in a timely manner. A
similar thing would happen if a display was overly complex.