30 IF PEEK(&4000)=&C7 THEN PRINT"PAL chip absent/inactive":END
40 OUT &BC00,&F:OUT &3DFF,&C7
50 IF PEEK(&4000)=&C0 C7 THEN PRINT"PAL I/O layout on CRTC 0/1/2":END60 IF PEEK(&4000)=&C7 C0 THEN PRINT"PAL I/O layout on CRTC 3/4":END
70 PRINT"Error!"
</pre>