11 Aug
2000
11 Aug
'00
1:45 a.m.
Hi,
Does somebody here know the formulas for calculating the offsets and bits
in the CGA memory? Or maybe a quick routine for plotting a pixel? The BIOS
routine sure seems SLOW to me. I'm experimenting with these older
machines, so I'm working a little with these cool graphics cards! (The CGA
is great! Well, I LOVE IT! :-) )
Ciao,
Lionel
11 Aug
11 Aug
7:27 a.m.
Hi,
Does somebody here know the formulas for calculating the offsets and
bits in the CGA memory? Or maybe a quick routine for plotting a pixel?
The BIOS routine sure seems SLOW to me. I'm experimenting with these
older machines, so I'm working a little with these cool graphics
cards! (The CGA is great! Well, I LOVE IT! :-) )
Ciao,
Lionel
You might see if you can find "A Programmers Guide to PC &
PS/2 Systems" Richard Wilton ,published by M-S Press. Came out
in 1987 and received rave reviews in all the trade publications. It
has ass. routine listings to access BIOS for CGA thru VGA and a
wealth of other info on the varios Dos video systems.
ciao larry
lgwalker(a)look.ca
walkers(a)altavista.net
bigwalk(a)xoommail.com
8:08 a.m.
There were books written about that. (long enough back that they're
probably in your local library!) There were a couple dealing with bitmapped
graphics for Turbo (fill in name of language here) and there was one for
Qbasic. The use of the BIOS calls was always considered to be the slowest,
by the way, but it may not be so bad with today's machines, able to shadow
the ROM, and running at 100x the speed of the 5 MHz 8088.
Dick
----- Original Message -----
From: Lawrence Walker <lgwalker(a)look.ca>
To: <classiccmp(a)classiccmp.org>
Sent: Friday, August 11, 2000 1:27 PM
Subject: Re: CGA graphics
Hi,
Does somebody here know the formulas for calculating the offsets and
bits in the CGA memory? Or maybe a quick routine for plotting a pixel?
The BIOS routine sure seems SLOW to me. I'm experimenting with these
older machines, so I'm working a little with these cool graphics
cards! (The CGA is great! Well, I LOVE IT! :-) )
Ciao,
Lionel
You might see if you can find "A Programmers Guide to PC &
PS/2 Systems" Richard Wilton ,published by M-S Press. Came out
in 1987 and received rave reviews in all the trade publications. It
has ass. routine listings to access BIOS for CGA thru VGA and a
wealth of other info on the varios Dos video systems.
ciao larry
lgwalker(a)look.ca
walkers(a)altavista.net
bigwalk(a)xoommail.com
8:15 a.m.
You might see if you can find "A Programmers
Guide to PC &
PS/2 Systems" Richard Wilton ,published by M-S Press. Came out
in 1987 and received rave reviews in all the trade publications. It
has ass. routine listings to access BIOS for CGA thru VGA and a
wealth of other info on the varios Dos video systems.
Or Michael Abrash's Black Book. (He worked on the Doom series of games) He
has a wonderful look at detailed access to the frame buffer (although he
focusses somewhat on VGA)
--Chuck
8899
days inactive
8899
days old
3 comments
4 participants
participants (4)
-
cmcmanis＠mcmanis.com -
lgwalker＠look.ca -
lionelp＠worldonline.co.za -
richard＠idcomm.com