mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-23 20:08:05 +11:00
8bf6258673
Adding a delay such as the 20ms one we have in AVR programmer's initialization routine is tricky without a word like TICKS. This implementation is highly inaccurate, but more accurate and reliable than a "ballpark" DO..LOOP...
14 lines
634 B
Plaintext
14 lines
634 B
Plaintext
STABLE ABI: As a compatible binary, this binary follows the
|
|
same stable ABI as its z80 counterpart.
|
|
|
|
PS CHECKS: Unlike z80 boot code, we don't check PS at each next
|
|
call (we do check RS though). It is the responsibility of every
|
|
native PSP-modifying word to call chkPS, . Also, chkPS, is a
|
|
bit different than in z80: it is parametrizable. The idea is
|
|
that we always call chkPS, before popping, telling the expected
|
|
size of stack. This allows for some interesting optimization.
|
|
For example, in SWAP, no need to pop, chkPS, then push, we can
|
|
chkPS and then proceed to optimized swapping in PS.
|
|
|
|
To assemble, load blocks 445 through 461
|