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-rw-r--r--nuttx/configs/z80sim/include/board.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/nuttx/configs/z80sim/include/board.h b/nuttx/configs/z80sim/include/board.h
index eb7aa3685..4cc4b97da 100644
--- a/nuttx/configs/z80sim/include/board.h
+++ b/nuttx/configs/z80sim/include/board.h
@@ -55,6 +55,9 @@ extern "C" {
#define EXTERN extern
#endif
+EXTERN void z80_lowputc(char ch) __naked;
+EXTERN char z80_lowgetc(void) __naked;
+
#undef EXTERN
#if defined(__cplusplus)
}