Path: utzoo!utgpu!water!watmath!clyde!att-cb!att-ih!alberta!ubc-cs!uw-beaver!mit-eddie!ll-xn!ames!pasteur!ucbvax!hplabs!hpcea!hpfcdc!stroyan
From: stroyan@hpfcdc.HP.COM (Mike Stroyan)
Newsgroups: comp.sys.hp
Subject: Re: HP-835 TruboSRX - What!
Message-ID: <5570031@hpfcdc.HP.COM>
Date: 14 Apr 88 22:32:56 GMT
References: <1210@zen.UUCP>
Organization: HP Ft. Collins, Co.
Lines: 43

> What the heck are:
>    "Multiple obscurable movable accelerated (MOMA) windows allowing
>     multiple windows (up to 32) to be created moved obscured and
>     simultaneously accelerated."
>
> I'm sure I missed something in my somewhat limited education....but what
> are 'accelerated windows'.

As technology progresses, local jargon is sure to follow.

Accelerated windows are windows that are drawn into by the graphics
processors.  The old HP98710 could use a transformation processor to
render into the full frame buffer, but could not draw into one of the
window system windows using acceleration.  The window system could only
be drawn in with software running on the CPU.  The SRX can run one
accelerated application at a time, drawing into the image planes
while the window system does unaccelerated graphics into windows in
the overlay planes.

The TurboSRX can run up to 32 applications at a time that time-share
its three transform engines.  Each application writes into its own
window in the image planes.  The windows may be moved around and can
overlap each other.  When drawing in a window partially obscured by other
windows, the output is clipped to the visible part of the window.  In
the TurboSRX, the obscured parts of an accelerated window are not
retained for later exposure, requiring that a window be redrawn to
handle shuffling to the front.  The applications using accelerated
windows must be compatible about the display mode, since all will be
displayed with the same color mode and double buffering buffer.

>                                            ... with a speed increase of
>        3-10 times (just tell me how?) ...

There are three transformation processors in the TurboSRX compared to
one in the SRX.  There are also improvements in the performance of
parts of the graphics pipeline.

Mike Stroyan, [hplabs!]hpfcla!stroyan

I speak for myself, not for Hewlett-Packard.

P.S.  They are still 8 amp fuses, but one of the power plugs has gone
	  from 4.4 to 6.2 amp rating.