[cc65] is the following safe, i think not

.export         _putchar
.import         popa

ECHO    =       $FFEF           ; print character from A

_putchar:
        jsr     popa
        ORA     $80
        JSR     ECHO
        RTS

The code works, but when used in a C function, the value passed gets
clobbered, e.g.:

function foo(char bar) {

putchar(blah[bar]);  //works
putchar(blah[bar]); //fails

If do this I can work around the problem:

function foo(char bar) {
char tmp=bar;

putchar(blah[tmp]);  //works
putchar(blah[tmp]); //works too


So I know that my _putchar code is the problem, but what is the fix?

Thanks.
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