You can get the sourcecode
here in the seasons directory of
my dos_programs github repository: git clone https://github.com/deater/dos_programs/
More info
127 Byte demo targeting an 8086 with MCGA graphics.
This is similar to what you might find in the PS/2 Model 25
machines in the computer labs at my middle/high school (replacing
the Apple IIs)
Was dusting off old code on mine from the 1990s where I did a lot
of inline assembly in Pascal based on the PCGPE.
Waits for retrace which should give it consistent speed.
Did a lot of tricks to get it to display the four color bars.
Including changing the direction flag.
It is tricky trying to remember which instructions set the Zero flag
as the 8086 and 6502 are different in this regard.
Most of my x86 assembly has been on a 386 or newer so it's tough
remembering which tricks won't work on the 8086.
It's also a lot harder to optimize for size on 8086 than on 6502, there
are just so many complex instructions with complex size rules on
x86.
In the end the 8086 does win for code density, I can't quite get more
than two color bars going on an Apple II.
