ASM

DISK I/O

Bypass the DILoad's bug

The program I'm writing can format volumes, and before calling DIFormat, DIVerify, and DIZero, you're supposed to call DILoad to make sure the routines are loaded, and you can call DIUnload when you're done.

FutureBasic's versions of those commands are "CALL DILOAD" and "CALL DIUNLOAD". When I use these statements in my program, it crashes with a bus error, an illegal instruction error, or some other error. Formatting works fine if I leave the statements out. :-)

But when I implement DILoad and DIUnload in assembly, via the following program, everything works fine:

COMPILE 0,_caseInsensitive_strResource_dimmedVarsOnly_macsbuglabels_noRedimVars
DIM dummy&
END GLOBALS

LOCAL FN MyDILoad
  ` MOVE.W #$0002,-(sp)
  ` DC.W $A9E9
END FN

LOCAL FN MyDIUnload
  ` MOVE.W #$0004,-(sp)
  ` DC.W $A9E9
END FN

WINDOW 1
PRINT "hello."
INPUT dummy&
FN MyDILoad
FN MyDIUnload
INPUT dummy&

Using these routines in place of the FutureBasic calls in the application I am writing works as well.