The way we want to use the INITBSS segment - and especially the fact that it won't have the type bss on all ROM based targets - means that the name INITBSS is misleading. After all INIT is the best name from my perspective as it serves several purposes and therefore needs a rather generic name.
Unfortunately this means that the current INIT segment needs to be renamed too. Looking for a short (ideally 4 letter) name I came up with ONCE as it contains all code (and data) accessed only once during initialization.
Moving __cwd from BSS into INITBSS does of course ;-) not only impact the CBM targets but all targets with disk I/O support.
Note: Code using `__cwd-1` may trigger an ld65 range error because __cwd may end up at the very begining of a segment. As far as I see this is an ld65 bug which I'm not try to fix - at least here.
This reduces the potential to flicker, but creates two separate
memory areas in the high memory.
For applications which require a large continuous memory space in
high memory, atarixl-largehimem.cfg is provided. With high IRQ
activity or DL interrupt there might be flicker.
- First chunk checks system (if it's XL and memory is ok).
- Second chunk contains the contents for the shadow memory beneath the
ROM and copies the contents to their destination address.
It also moves the screen memory to low memory in front of the program.
The target 'atarixl' is to be used for Atari XL (and better) machines.
It will disable the OS ROM and enable the Shadow RAM available on
those machine.
Note: This commit is only the inital step towards for this goal that just
replicates the target 'atari' as a starting point!
