mirror of
https://github.com/hsoft/collapseos.git
synced 2024-12-25 18:48:09 +11:00
17 lines
615 B
Plaintext
17 lines
615 B
Plaintext
Z80 boot code
|
|
|
|
This assembles the boot binary. It requires the Z80 assembler
|
|
(B200) and cross compilation setup (B260).
|
|
|
|
On top of that, it requires RAMSTART to be defined as the
|
|
beginning address of RAM. This is where system variables are
|
|
placed. HERE is then placed at RAM+80 (ref B80).
|
|
|
|
We also need RS_ADDR to be set to the bottom address of the
|
|
Return Stack.
|
|
|
|
RESERVED REGISTERS: At all times, IX points to RSP TOS and IY
|
|
is IP. SP points to PSP TOS, but you can still use the stack\
|
|
in native code. you just have to make sure you've restored it
|
|
before "next". (cont.)
|