[cc65] Using CC65 for MMC Replay plugin programming

Dear CC65 users,

i finally got an MMC Replay with V0.54 Bios and wanted to try out plug in
coding. I got some sources by "The-Dreams" with which i can open and receive
the file, the plugin is executed on.
They are working so far and i started to convert the sources to CC65 by
Ullrich Bassewitz.
I wrote a c header file to wrap the assembler routines written by
"The-Dreams" so that i can call these from a c routine.
When i tested out my xxxplgin.bin, which contained just an empty main
routine (void main(void)), on a *.xxx file i recognized that the code
crashes right inside the init code of the compiled c program (inside
crt0.s).
Further experiments showed the "jsr CLRCH" inside "crt0.s" to be responsible
for the crashing of the plugin.
When i change the jsr by hand to a bit instruction, the plugin
returns properly to the file browser.
Can anybody with a little experience in MMC Replay plugin programming give
me a hint, why the CLRCH routine is not compatible to the MMC Bios although
routines like CHROUT work?
Of course i search a way to come around modifying the CC65 startup code.

Thank you

Monte Carlos

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