Small Device C Compiler suite

Michael,

>>sdcc hello.c
>hello.c:3: error:mcs51reg.h: No such file or directory
>?ASlink-Warning-Undefined Global '__sdcc_external_startup' referenced by
module 'hello'
>?ASlink-Warning-Undefined Global '_printf' referenced by module 'hello'
>

You have to fix two problems:

1. Compiler installation: Your compiler does not know where to find the
header and library files. Reinstall the compiler & follow the installation
instructions.

2. Before using printf() you have to define putchar() and setup serial
communication.
E.g. use ser_ir.c (in device/lib) and

 #define putch(c) ser_putc(c)

Béla