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1986-07-07
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This library contains 3 VERY simple programs for the IBM Enhanced Graphics
Adaptor: 43on.com, 25on.com and pallette.com (and source for pallette). There
is also a short batchfile which I use for making .com files.
43on and 25on assume that the EGA is being used in 350 line mode, either as
an IBM Mono emulator, or with an IBM Enhanced Color Display in Enhanced Color
Mode (ie: 350 visible scan lines rather than 200). 43on.com will put the EGA
into 43 line mode (with a cursor!) while 25on.com will put it back into 25 line
mode. Some programs will work OK with 43 line mode, some won't. The only
trick is that the EGA fails to live up to my (skimpy) documentation when it
is switched to 43 line mode, and does NOT reset the cursor start register as
it should - so 43on.com also sets the cursor start. These were created with
debug, so there is no source.
Pallette.com is just a quickie to let you play with the color pallette with
the Enhanced Display (5154). Put something colorful on the screen, then
invoke the program. Press '0'..'9' ':'..'?' to select pallette registers
0..15, then use 'r', 'g', 'b' to vary the amount of each color in the mix
(cycles thru black, dim, normal, bright). Any other key should take
you back to DOS. The new pallette will be used until you use "mode color"
or the like. This has hardly been used, so no guarantees. Source is included.
Let me know if you make it more useful.
Makecom.bat is a batch file I often use to create .com files from .asm
files. Use it thus:
makecom sourcename
Good Luck
Zhahai Stewart (303) 449-8180
HiSystems
6521 Old Stage Rd.
Boulder, CO 80302 compuserve 74076,252