20 Mar
2010
20 Mar
'10
5:12 a.m.
On 3/17/2010 3:06 PM, Tony Duell wrote:
I'm not sure I understand the question: There is no capture device made
that can do it, so I have no device to capture from.
I do have an Extron unit that can convert RGB TLL to analog RGBH with
sync on green but it doesn't handle the *I* of RGBI, nor the recoloring
of color index #6.
I have a solution that works for 95% of the cases that don't involve
timing tricks (like switching palettes mid-screen) that is cheating, but
it seems to work: I have an old ATI VGA with a program that can put the
card into a CGA-like mode where the register writes behave like CGA and
not like VGA -- palette and background changes work like they should on
CGA, the font is 8x8 like CGA, and the output is 400 lines (200
line-doubled) and that can be captured with any vga->video converter.
It's the last 5% I'm striving for, since the stuff worth capturing is
the stuff that uses tricks to extend CGA.
Ah, but then you would like assembler -- that's where our two worlds meet.
--
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/
On 3/16/2010 3:09 PM, Tony Duell wrote:
Right. And what are you capturing it on? What inputs _exactly_ do you
have? For example, do you have separate syncs, composite sync, or
sync-on-green? What are you really trying to do? Waht is the
machine you are taking the
outputs from, and what are you trying to do with them?
Trying to capture the output of a program running on an IBM 5160 that
only looks correct via CGA RGB output. Had I enough
free time, I could learn it too, but I don't have much
these days. My free time in my youth was spent learning the hardware
from the outside (ie. assembler programming), not the inside.
I have the opposite problem. I learnt hardware first. Which means I tend
to think about probramming as to what it will do to the hardware
(somtimes at a very low level).