> Does anyone know what frequencies the 98785A supports?  I don't remember.
> Something in the back of my head tells me it's a Catseye monitor.

I got this off comp.mumble.mumble.hp a while back.  There's a bunch of crap
in here, but all the timing info for the 98785A is down there somewhere.

Enjoy

Dave

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Article 1755 of comp.sys.hp.hardware:
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From: myers@fc.hp.com (Bob Myers)
Subject: Re: Scan rates of 98751A 19" color monitor?
Message-ID: <Cn55ny.6E5@fc.hp.com>
Date: Wed, 23 Mar 1994 23:38:21 GMT
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Andrew Wang (andywang@crown.berkeley.edu) wrote:
> Hello,
>    I am looking for the scan rates of an HP 98751A color monitor,
> to see if it is possible to hook this beast up to a PC clone.  
> What I know is: It's a trinitron (Sony) tube, and there are R,G,and
> B inputs, with sync on green.  Also, it is not hard to get a cable
> from computer stores that specialize in CAD/CAM systems.  What I don't
> know is if it should work, or whether the monitor is multisync or not.

This monitor is not multisync; it is a single-frequency product intended
for 1024 x 768 at 60 Hz, with a horizontal rate of 47.7 kHz.  The very-similar
98752A is also single-frequency, but for 1280 x 1024 at 60 Hz (63.34 kHz
horizontal).  The 1024 x 768 timing is an old HP-unique one; the 1280 x 1024
isn't exactly a standard either, but as this was Sony's standard 1280 timing
at 60 Hz, a number of workstation and PC systems used it.


Bob Myers                                   | myers@fc.hp.com      
Senior Engineer, Displays & Human Interface | Note: The opinions presented
Advanced Systems Division		    | here are not those of my employer
Hewlett-Packard Co., Ft. Collins, CO        | or of any rational person.       


>From comp.sys.hp.hardware Wed May 25 11:41:15 1994
Path: cronkite.cisco.com!ames!agate!howland.reston.ans.net!europa.eng.gtefsd.com!MathWorks.Com!news.kei.com!ub!csn!col.hp.com!fc.hp.com!pej
From: pej@fc.hp.com (Phil Jensen)
Newsgroups: comp.sys.hp.hardware
Subject: Re: 98785A Trinitron monitor
Date: 25 May 1994 13:11:29 GMT
Organization: at HP Fort Fun Colorado
Lines: 57
Distribution: usa
Message-ID: <2rviq1$fgl@tadpole.fc.hp.com>
References: <24MAY199421494989@ndadsa.gsfc.nasa.gov>
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David Okerson (okerson@ndadsa.gsfc.nasa.gov) wrote:
: I would very much appreciate your help in finding out the technical
: parameters of this 16" color monitor.  In particular, I need to find
: the nominal horizontal and vertical scan frequencies.  If you know
: anything else, such as the input connector(s) used, or whether it
: uses composite, separate horizontal and vertical, or sync on green,
: I would also appreciate that information.

: Thank you very much for your help.

This should about cover it.
Phil

***************************************************************************

Timing summary for HP-CCMO monitors

All of our monitors for a given resolution (1024 x 768 or 1280 x 1024) use 
the same timing.  In addition, the following signal/input specifications are 
common to all:

1. Input connectors and impedance:  Separate BNC connectors for Red, Green, and
                                    Blue.  75 ohms impedance.

2. Signal levels:  Signal levels per EIA standard RS-343A; white positive.
                   Composite sync to be supplied on the Green signal only
                   (Note: horizontal sync pulses need not be supplied during
                    the vertical sync pulse.)

3. Timing

       All signal timing is +/- 5%.

       98751A/98785A:
             Normal Field:  1024x768 @ 64.1088 MHz dot clock

       98752A/98789A:
             Normal Field: 1280x1024 @ 108.181 MHz dot clock

                                       1024x768           1280x1024

               Horiz. sweep freq.:     47.7 kHz           63.34 kHz
         A.    Horiz. period ("1H"):   20.96  uS          15.788 uS
         B.    Horiz. "front porch":    1.00  uS (64)      0.407 uS
         C.    Horiz. sync width:       2.00  uS (128)     1.701 uS
         D.    Horiz. "back porch":     2.00  uS (128)     1.849 uS
         E.    Horiz. active scan:     15.97  uS (1024)   11.832 uS
         F.    Horiz. blanking:         4.99  uS           3.956 uS

               Vertical frame rate:       60 Hz (non-int.)   60 Hz (non-int.)
         G.    Vert. active period:    16.097 mS          16.167 mS
         J.    Vertical blanking:       0.570 mS            .505 mS
         K.    Vertical period:        16.667 mS          16.672 mS

         L.    Vertical "front porch": 62.89 uS (3H)      47.36 uS (3H)
         M.    Vertical sync width:    83.86 uS (4H)      47.36 uS (3H)
         N.    Vertical "back porch": 419.20 uS (20H)    410.49 uS (26H)

Path: cronkite.cisco.com!ames!hookup!swrinde!sdd.hp.com!col.hp.com!fc.hp.com!myers
From: myers@fc.hp.com (Bob Myers)
Newsgroups: comp.sys.hp.hardware
Subject: Re: 19" Monitor Scan Rate
Date: 12 Jul 1994 19:24:49 GMT
Organization: Hewlett-Packard Fort Collins Site
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Mark Flitter (mflitter@easamsod.demon.co.uk) wrote:
> Does anybody know the horizontal scan rate of an A1097C (as
> supplied with the 710 workstations)?
> Is the `horisontal scan' the same as the refresh rate?

No, the "refresh rate" generally refers to the vertical rate, although it
is sometimes unclear for interlaced displays whether one is talking about
the "field" rate or the "frame" rate.  (Not to worry here; all HP workstations
run non-interlaced display formats.)

The A1097C (any of the A1097 models, for that matter) is a fixed-frequency
(not "multisync") monitor intended to support a display format of 
1280 x 1024 at 72 Hz refresh; the horizontal rate is 78.125 kHz.

The details of this timing are listed below:


HP 1280 x 1024  72 Hz  timing  

Pixel clock.......................135 MHz   (7.407 ns)

Horizontal sweep frequency......78.125 kHz

Horizontal period (total).......12.799 us  (1728 pixels)
Horizontal active time...........9.481 us  (1280 pixels)
Horizontal front porch...........0.474 us  (  64 pixels)
Horizontal sync width............1.422 us  ( 192 pixels)
Horizontal back porch............1.422 us  ( 192 pixels)
Horizontal blanking..............3.318 us  ( 448 pixels)

Vertical sweep frequency........72.008 Hz ("Refresh rate")

Vertical period.................13.887 ms  (1085 lines)
Vertical active time............13.107 ms  (1024 lines)
Vertical front porch............38.39  us  (   3 lines)
Vertical sync width.............38.39  us  (   3 lines)
Vertical back porch............703.95  us  (  55 lines)
Vertical blanking................0.780 ms  (  61 lines)

All video signals conform to RS-343A levels (as listed below), and expect
75 ohms termination.

RS-343A Signal Levels

White.........0.714V above blank
Black.........0.054V above blank
Blank.........REFERENCE (AC coupled system)
Sync Tip......0.286V below black


Bob Myers                                   | myers@fc.hp.com      
Senior Engineer, Displays & Human Interface | Note: The opinions presented
Workstation Systems Division                | here are not those of my employer
Hewlett-Packard Co., Ft. Collins, CO        | or of any rational person.