Stan Barr wrote: On the PCjr, it is mode 8. On the PC, you had to go through the textmode trickery I explained in my last post. The advantage of the PCjr mode (and composite color mode on stock CGA, another 160x200 mode) is that there is no character/attribute waste: A single byte holds 2 pixels. It was a great mode for games because the simplicity of pixel packing was fast: mov al,pixel1 mov cl,4 shl al,cl or al,pixel2 Only MCGA 320x200x256 was faster. -- Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/ Help our electronic games project: http://www.mobygames.com/ Or check out some trippy MindCandy at http://www.mindcandydvd.com/ A child borne of the home computer wars: http://trixter.wordpress.com/

Nitpick: ASCII is a 7-bit code; there is no such thing as ASCII 221 or 223. (You presumably mean "stuff 221 or 223 in the corresponding character-cell location", but strictly speaking that's got nothing to do with ASCII.) /~\ The ASCII der Mouse \ / Ribbon Campaign X Against HTML mouse at rodents.montreal.qc.ca / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B

This sounds almost like doing colours when doing graphics on the C64! Cheers, Bryan

In article <43D035C8.6050909 at oldskool.org>, Jim Leonard <trixter at oldskool.org> writes: Let me i) recommend that you definatley watch this! ii) brag that it was created for my demoparty Pilgrimage where it won 1st place -- and rightly so! -- "The Direct3D Graphics Pipeline"-- code samples, sample chapter, FAQ: <http://www.xmission.com/~legalize/book/> Pilgrimage: Utah's annual demoparty <http://pilgrimage.scene.org>

Oh.. and next time.. more TRON! :) maybe a little WarGames... Cheers, Bryan

Eric J Korpela wrote: Nope, I've tried :-) On my AT&T PC 6300, which uses an MC6845 but with 32K RAM (to support the 640x400x2 mode), trying to set one scanline per character cell does nothing, and that is what would be required. I'm not in front of my CGA right now, but I seem to recall that trying to set character cell height to anything other than 8 (the default) 4, or 2 caused loss of screen sync and led to garbled display. It might be possible to tweak other stuff to compensite, like vertical_start and vertical_total, but I haven't tried. I have gotten two graphics-mode video pages to work, but it's odd: vertical_start and vertical_total adjustment don't take long to garble, but horizontal start and horizontal total can take a ton of punishment. The most usuable mode I got was 160x200 4 colors, two video pages, but displayed as a COLUMN that was CENTERED in the middle of the screen. Odd, but at least it was stable :-) For even more interesting effects, look at: http://www.mobygames.com/game/dos/seven-spirits-of-ra/screenshots/gameShotI… Same technique, but using *all* characters instead of just the half-bar characters. Starts to resemble Spectrum graphics at that point. -- Jim Leonard (trixter at oldskool.org) World's largest electronic gaming project: http://www.MobyGames.com/ A delicious slice of the demoscene: http://www.MindCandyDVD.com/ Various oldskool PC rants and ramblings: http://www.oldskool.org/