[Sdcc-user] 8051 -> Z80

[Russel W. <ru...@ru...>]

The traditional Hello World program variation for avoiding printf is:

    unsigned char * message = "Hello World!\n" ;
    
    int main() {
      unsigned char * p = message ;
      while (*p != 0) {
        putchar(*p++) ;
      }
      putchar('\n') ;
      return 0 ;
    }

With the addition of code to implement putchar (and initialize timer 1
and the serial port etc.) this works fine with sdcc -mmcs51 using the
s51 simulator.  Using sdcc -mz80, everything compiles fine as is since
there is a default putchar implementation.  However on running with sz80
I get a problem:

    1065 elon:Z80 |> make cleanall helloWorld_1.ihx
    rm -rf *.sym *.rst *.rel *.map *.lst *.lnk *.ihx *.cdb *.asm *~
    a.out core
    sdcc -mz80 helloWorld_1.c
    1066 elon:Z80 |> sz80 -s /dev/pts/6 helloWorld_1.ihx
    uCsim 0.3.2-pre1, Copyright (C) 1997 Daniel Drotos, Talker Bt.
    uCsim comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.
    > 187 words read from helloWorld_1.ihx
    run
    Simulation started, PC=0x000000
    Stop at 0x000000: (106) Invalid instruction 0x00c3
    F 0x000000
    > 

Now given that others are using the z80 aspects of sdcc I assume I am
doing something trivially stupid and that it is not actually a problem
with the z80 port of sdcc or uCsim.  Anyone any ideas?

Thanks muchly.

-- 
Russel.
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