Is it perhaps OBD--On-Board Diagnostics? Sellam
On Mon, May 20, 2024 at 11:06 AM Wayne S via cctalk <cctalk@classiccmp.org> wrote: > The setup on the earlier monitors was sometimes call “ODB” , don‘t know > why. Was equivalent to setup. > > Sent from my iPhone > > > On May 20, 2024, at 11:02, Wayne S <wayne.su...@hotmail.com> wrote: > > > > In the vt100, setup menu “B” had an interlace on or off setting. > > I just looked it up. > > > > > > Sent from my iPhone > > > >> On May 20, 2024, at 10:51, Paul Koning via cctalk < > cctalk@classiccmp.org> wrote: > >> > >> > >> > >>>> On May 20, 2024, at 1:37 PM, Wayne S via cctalk < > cctalk@classiccmp.org> wrote: > >>> > >>> Young , hah. No i’m old 70. > >>> The pc monitors, not Tv, always had a setup menu. Even the Vt100 > series let you choose interlace if you needed. > >> > >> VT100? I don't think so. And yes, it has a setup menu, but that's > setup of the terminal functionality, not the monitor part. > >> > >> The earliest monitors could only handle one format. A major innovation > was "multisync" where the monitor would determine the horizontal and > vertical sweep rate and line count, and display things the right way. The > first PC I owned had one of those, and as far as I can remember it had > nothing that one would call a "setup menu". > >> > >> The reason interlace matters is not the very slight slope of the scan > line in analog monitors, but rather the fact that alternate frames are > offset by half the line spacing of the basic frame, so each frame sweeps > out the gaps in between the lines scanned by the preceding frame. It > matters to get that right, otherwise you're not correctly displaying > consecutive rows of pixels. In particular, when doing scan conversion > (from analog format to a digital X/Y pixel raster) you have to offset Y by > one every other frame if interlace is used, but not if it isn't. > >> > >> paul > >> > >> >
