mirror of
https://github.com/hsoft/collapseos.git
synced 2024-09-07 01:48:45 +10:00
17 lines
656 B
Plaintext
17 lines
656 B
Plaintext
8086 boot code
|
|
|
|
Code in the following blocks assemble into a binary that is
|
|
suitable to plug into Core words (B350) to achieve a fully
|
|
functional Collapse OS. It is structured in a way that is
|
|
very similar to Z80 boot code (B280) and requires the same
|
|
constants to be pre-declared.
|
|
|
|
RESERVED REGISTERS: SP is reserved for PSP, BP is for RSP and
|
|
DX is for IP. Whenever you use these registers for another
|
|
purpose, be sure to protect their initial value. Like with
|
|
Z80, you can use SP freely in native code, but you have to make
|
|
sure it goes back to its previous level before next is called.
|
|
|
|
|
|
(cont.)
|