Basic Fails When Assembled With CPU_6309

[jason6502]

This is on a simple HD6309-based SBC with 48K RAM (minus some I/O space) and 16K ROM at 0xC000-0xFFFF.

My build command line:

% asm6809 -3S --define BASEADDR=0xC000 --define SBC09=1 --define NATIVE --define CPU_6309 -o sbc6809bas.srec 6809bas.asm

Execute one of the generic ASCII Mandelbrot programs:

SBC6309N

>10 FOR Y=-12 TO 12
>20 FOR X=-39 TO 39
>30 CA=X*0.0458
>40 CB=Y*0.08333
>50 A=CA
>60 B=CB
>70 FOR I=0 TO 15
>80 T=A*A-B*B+CA
>90 B=2*A*B+CB
>100 A=T
>110 IF (A*A+B*B)>4 GOTO 200
>120 NEXT I
>130 PRINT " ";
>140 GOTO 210
>200 IF I>9 THEN I=I+7
>205 PRINT CHR$(48+I);
>210 NEXT X
>220 PRINT
>230 NEXT Y
>                                                                                                                       
>RUN                                                                                                                    
0                                                                                                                       
>

Changing the build line to specify --define CPU_6809 results in the correct output.

There are about 70 sections in the code where modifications for the 6309 have been made. If I find the culprit, I will post a followup here. However, given the small impact to performance of the changes (2-3%), it's not a high priority for me). Just wanted to document the issue.

[dominicbeesley]

Sorry, I only just spotted this - I will try and dig out my 6809/6309 debugging stuff this week and have a look. It could well be the use of GOTO's which I think have 6309 tweaks but I've probably not tested as well as I could.

D