Subj : Re: (16 bit) x86 Assemble
To   : hollowone
From : boraxman
Date : Tue Jun 03 2025 13:42:20

-=> hollowone wrote to Bob Worm <=-

 BW>
 BW> I could do with an INT 21h cheat sheet, man that interrupt does a lot of
 BW> things!
 BW>
 BW> Thanks for checking!

 ho> Well if you care about driving this discussion forward I can tell you
 ho> that I also have come back to a bit of 86 assembly these days.

 ho> I parked one project related to MS-DOS demoscene revival to check how
 ho> far i can go just booting up my own PC OS.

 ho> Bootstrap (first 512bytes to boot up from a floppy) already works.
 ho> Sending text and showing numbers too. I use it to welcome the user and
 ho> show how much memory is available on the system, which CPU is supported
 ho> and mark it in certain memory block before I read first sectors from a
 ho> floppy to boot up for more.

 ho> Now trying to understand conventional memory better assumed there is no
 ho> OS and I have no filesystem too.. it'd be fun to invent something more
 ho> creative than FAT12 as next step.

 ho> that's my current experiment as VESA 2.0 stuff. Int 10h and Int21h and
 ho> predefined PMODE extender connected to WATCOM is way to boring and
 ho> "I've done that already" kind of thing :)


Some years ago I dabbled a bit as well!

Nothing too fancy, but I created a small starfield scrolling program.
Being able to program the hardware directly is a lot of fun.
 
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