Re: [cc65] ca65 for stand-alone asm projects

On 11/11/2010 12:54 AM, Christian Grössler wrote:

>
> One idea was to have a "check load address" segment, which verifies that
> the selected load address of the exe isn't too low and will overwrite parts
> of DOS. Since I haven't found a way to abort the loading of the next memory
> segment(s), all it could do is issue a warning, that the program overwrote
> parts of DOS and the machine will later probably crash. At least better
> than a crash without anything indicating the reason of the crash, IMO.

IMHO its enuff to ive the warning. There are cases when you do not need 
a DOS and want to use all memory from $600 upwards. Maybe we can copy 
$700-$26ff to $e000-$ffff so teh program can exit cleanly. When you use 
the DOS memeory for dynamic data (aka after the C prgram has loaded) it 
would even be loadable from DOS ;)

>
> Another idea was to create a new "atarixl" configuration (similar to apple2
> and apple2enh), which copies the ROM into it's underlying RAM and adds
> some usable space there to the heap. Code for this was posted by Fatih
> Aygün
> some time ago. The first exe load segment could do this and then be
> overwritten
> by the later load segments of the program, therefore not using up memory
> at runtime.
> In this "atarixl" configuration, since we can expect a machine with 64k
> of memory, the INIT segment could also be loaded after the BSS and not
> consume runtime memory since it's residing on the stack area.

Ermmm... maybe your explaination is wrong worded, but when we copy the 
ROM ($c000-$cfff and $e000-$ffff) into teh underlaying ROM (same memroy 
regions) how do we gain more memory for the C program? We wouldl get 
more RAM when we copy C functions under the ROM and have a possibility 
to call them in a special way (switching off OS/IRQs, calling, switching 
on OS/IRQs after return).
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