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cc65/libsrc/serial/ser_get.s

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;
; Ullrich von Bassewitz, 2003-04-18
;
; unsigned char __fastcall__ ser_get (char* b);
; /* Get a character from the serial port. If no characters are available, the
; * function will return SER_ERR_NO_DATA, so this is not a fatal error.
; */
.importzp ptr1
.include "ser-kernel.inc"
.proc _ser_get
sta ptr1
stx ptr1+1 ; Save pointer to char
jmp ser_get ; Call the driver
.endproc