mjl@ut-emx.UUCP (mjl) (08/05/90)
In article <7137@helios.TAMU.EDU> n350bq@tamuts.tamu.edu (Duane Fields) writes: >I am about to buy a 3000 and a mistibushi diamondscan monitor. Has anyone >ever used this combination? A friend of mine believes that vga monitors will >always have the little black boarder, and that the 1950 may be a specially >designed system, made to eliminate the border in overscan mode. >Anyone know?? I just finished setting up my new A3000 with my diamondscan monitor, and am pretty pleased with the result. A VGA -> multisync cable is required; this didn't come with the diamondscan I bought (about a year ago). Basically it just passes the RGB signal & ground along with some sync signals. Anyhow, the adjustment of the A3000 de-interlacer went smoothly, as described in the manual. The display passed all tests. As to your question re the border: yes, there is a _small_ black border around the screen with the de-interlacer enabled, even with the diamondscan adjusted to maximum screen size both horizontal and vertical. With the de-interlacer disabled, the maximum screen size is much "larger" and will completely cover the visible screen area if desired (same # of pixels, though). I have no idea why this occurs (may be important for video applications). I have a feeling the "border" you mention is much larger for IBM systems since you can't use the overscan region. I've been able to get the maximum overscan allowed by AmigaDos 2.0. However, when you do this the top scan line will flicker if it's any other color than black. Setting the standard overscan region down 1 or 2 pixels from the top maximum solves this problem. The only thing I'm less than happy about is that there is a lot of flicker when scrolling multi-color text (say, blue mixed in with black, using the standard 2.0 colors) on a 7xx by 4xx screen through the de-interlacer (can't really say 'interlaced' any more, I guess). I have a feeling this has more to do with limitations of the blitter performance than anything else (is this right?). Maurice LeBrun Institute for Fusion Studies mjl@fusion.ph.utexas.edu University of Texas at Austin