Denial

Quick question - On NTSC unexpanded VIC 20 do you get all 30 lines visible on your screen with these pokes:

poke36865,8
poke36867,188

If not all lines are visible, then how many? (You can count the 7 lines of garbage). Can you make more lines visible on your monitor by making 36865 smaller than 8?

Just asking for a small project; I want to make it NTSC compatible, but it needs 30 lines... (An old VIC-I document said there's not enough raster lines, but VICE emulator shows 31 in NTSC mode.)

Sorry, maxmium resolution on a real NTSC-VIC-20 is 233 rasterlines, which I just measured with a 1084 that has a vertical-squeeze knob:

http://sleepingelephant.com/ipw-web/bul ... 9&start=17

Realistically you will only be able to put about 200 rasterlines (= 25 character lines) on screen and be safe on most display-devices with NTSC. Also see pixel's thread in the Games-section for arukanoido where he faced the same problem with NTSC.

Thanks for the quick response. Maybe 29 will be enough... Have you measured the pixel ratio? VICE suggests 0,833 (as in my emulator screenshot), but when comparing to real life VIC video captures (and how I remember it) something like 0,750 would be closer?

29 character lines will only be visible on display devices that allow for vertical squeeze, not on more common devices like TVs and such.
Somewhere around 26-27 character lines would be the usual limit for NTSC, see here:

http://sleepingelephant.com/ipw-web/bul ... f=2&t=7189

Also, you seem to be using a very old VICE-version. I suggest trying a recent one from http://vice.pokefinder.org

You will see that NTSC-aspect ratio is 0.752 there

tokra wrote:Also see pixel's thread in the Games-section for arukanoido where he faced the same problem with NTSC.

Most of the time I add useful information such as this to the Denial wiki page for the VIC chip at http://sleepingelephant.com/denial/wiki ... nology_VIC