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.
Sent from my iPhone > On May 20, 2024, at 10:06, CAREY SCHUG <sqrfolk...@comcast.net> wrote: > > Wayne, you must be one of those thirty-something techies from another thread. > > for those of us in our 60s and 70s,.... > > setup mode? huh? old TVs and monitors were purely analog. No on-screen > displays and non-volatile memory bytes for setup. adjustments for size and > position were rheostats. interlace (on TVs) was because the incoming sigonal > started SLIGHTLY later for the interlaced frame and the horizontal sync was > slightly different (advanced?) on the incoming signal relative to the > vertical sync. > > With digital, the conversion of the analog input to digital for the display > has to start recording only half the first line. and whatever conversion > there is because on the analog display, the scan line is at a slight angle, > lower on the right, so the interlaced frame starts at the same vertical > height, in the middle, as the other frame started on the left side. > > so, just curious. how do digital TVs (and monitors) work? I presume the > dots are a rectangle, not sloping down to the right, no half a line at the > top and bottom. Do they just assume the brain can't tell that (for the > converted old analog tv signal) the image therefor slopes UP very slightly to > the right from what it "should" be? and the top line is blank on the left > side because that is the interlace frame? > > <pre>--Carey</pre> > >> On 05/20/2024 11:46 AM CDT Wayne S via cctalk <cctalk@classiccmp.org> wrote: >> >> >> IIRC, didn’t most older pc monitors have a setup mode where one of the >> options was interlace or non-interlace. >> >> >> Sent from my iPhone >> >>>> On May 20, 2024, at 09:35, Paul Koning via cctalk <cctalk@classiccmp.org> >>>> wrote: >>> >>> I think you have that backwards. >>> >>> TVs use interlace. Older PC displays may do so, or not; typically the 480 >>> line format was not interlaced but there might be high resolution modes >>> that were. The reason was to deal with bandwidth limitations. >>> >>> Flat panel displays normally support a pile of input formats, though only >>> the "native" format (the actual line count matching the display hardware) >>> is directly handled, all the others involve reformatting to the native >>> format. That reformatting generally results in some loss of display >>> quality, how much depends on how well the relevant hardware is designed. >>> And interlaced formats are often supported not just for the VGA input (if >>> there is one) but also for DVI/HDMI inputs. To get the accurate answer you >>> have to check the specification sheet. >>> >>> paul >>> >>>> On May 20, 2024, at 12:13 PM, CAREY SCHUG via cctalk >>>> <cctalk@classiccmp.org> wrote: >>>> >>>> This may have been covered before, VERY early in this tread. >>>> >>>> I think I tried a game on a flatscreen, and had issues. I don't know if >>>> it applies to the radio shack Color Computer, the interest of the original >>>> poster. >>>> >>>> many games and entry pcs with old style tv analog format, don't interlace, >>>> and tube TVs nearly all (except maybe a few late model high end ones?) are >>>> fine with that, but I seem to recall that most or all digital/flat screen >>>> can't deal with non-interlace. >>>> >>>> <pre>--Carey</pre> >>>
