disable GETCWD command until I have a proper way to test it

diff --git a/libsrc/atari/shadow_ram_handlers.s b/libsrc/atari/shadow_ram_handlers.s
index 80dc5c2d19d45fadf0cf008cc3f8b9b61765d463..1edc82d5153fb07a136319a46b343489fb8ea4e8 100644 (file)
--- a/libsrc/atari/shadow_ram_handlers.s
+++ b/libsrc/atari/shadow_ram_handlers.s
@@ -241,8 +241,6 @@ CIOV_call:
 ; and some only use the pointer (like e.g. OPEN), and some use both.
 ; So we need function specific handlers to correctly deal with
 ; buffers which are overlapping with the ROM area.
-; All input and output registers need to be preserved (I'm not 100%
-; sure about Y as input, but let's preserve it for now.)
 ;
 ; FIXME: Currently only the requests used by the runtime lib are handled.
 
@@ -266,13 +264,17 @@ my_CIOV:
        beq     CIO_filename2
        cmp     #GETCWD
        bcc     CIO_filename            ; filename as input parameter in buffer, length not used
-       beq     CIO_read                ; input
+       beq     CIO_invalid             ; GETCWD not supported yet
        bcs     CIO_call_a              ; other commands: assume no buffer
 ; not reached
 
 CIO_write_jmp:
        jmp     CIO_write
 
+CIO_invalid:
+       lda     CIO_a
+       ldy     #DINVCM
+       rts
 
 ; READ handler
 ; ------------