20 Jan
2006
20 Jan
'06
4:18 p.m.
> In addition to the BROWN v Yellow,
> there were differences in the handling of BRIGHT BLACK.
> (Joe Campbell borrowed a "real" CGA card from me when he
> found out that his Corona did not give the same color as IBM.)
On Thu, 19 Jan 2006, Tony Duell wrote:
Surely any differences were in the monitor. Given
that there are 16
possible colours, and 4 bits on the output DE9, it's hard to see how the
purely-digital card could make any difference.
What SHOULD bright black on black (08) do? From the card, it should output R=0, B=0, G=0, I=1.
It's hard to see how
any CGA _card_ would do otherwise.
What foreground color?
what background color?
That's somewhat meaningless. The monitor should display a dark grey if
given those inputs.
Oh hang on... You're thinking of the blink bit, right? There's a bit in
one of the setup registers that turns the intensity bit of the background
colour into a blink-control bit. I would _guess_ without looking at the
card that 1000 as a forground colour is dark grey, 1000 as a background
colour is eitehr dark grey (if blinking is disabled), or black with
blinking forground if blinking is enabled.
-tony