Sorry, I seem to have lost attributions for this text. If you wrote it then let me know and I'll acknowledge you -- PMM > I have one HP300 system working fine, and am trying to get a second one > to work. Unfortunately, when I hook up the monitor to this one, it is > all messed up. > > Both have the same-looking RGB plugs, by messed up, I mean three columns > of what should be one column, with a raggedy looking sync problem. > The 300s all used 60 Hz monitors. The green cable has the necessary sync signals so make sure you have it connected correctly. There are also two different resolutions that use two different monitors: 1280x1024 and 1024x768. What is the product number of the card (on back by the connectors) and the monitor? ------------------------------------------------ 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) ----------------------------------------------- > Does anybody know the horizontal scan rate of an A1097C (as > supplied with the 710 workstations)? > Is the orisontal 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