Robert Purves on 28/9/01 10:24 PM  scrawled:

>> I'm writing an .INCL that will allow me to determine if MacsBug is
>> installed, and if it is, then I can call some debugging FNs.
>> 
>> What I'm having trouble with, is determining if MacsBig is
>> installed/running.
>> 
> < snip >
> 
>> In 32bit mode, [_Macjmp] should be the address of MacsBug, if MacsBug is
>> installed, but I need help interpreting the flags byte at address $BFF
>> 
>> And I'm confused about testing the flags byte if I'm running in 24bit mode.
> 
> 
> Who is old enough to remember when Macs went from 24 to 32 bit addressing?

I do!
I still remember the 512e

I've still got a couple of 24bit machines, and I want the code I'm writing
to compatible across as many Macs as possible

Pete...                             (the other one)

> I can't help on 24-bits, but the following is my translation of a routine
> in Apple's 32-bit system debugging tools:
> 
> local fn IsLowLevelDebuggerCallable
> dim callable as boolean
> callable = ( |_MacJmpFlag| != 0xFF ) ¬
> and ( (|_MacJmpFlag| and 0xE0) == (|_MacJmpFlag| and 0x60) ) ¬
> and ( [_MacJmp] != 0 ) and ( [_MacJmp] != 0xFFFFFFFF )
> end fn = callable

Any chance that you can write the callable = code in english ?
The callable = code is beyond me

Pete...                             (the other one)

> 
> long if fn IsLowLevelDebuggerCallable
> print "MacsBug is available"
> xelse
> print "MacsBug is not available"
> end if
> 
> 
> 
> Robert P.
> 
> 
> 
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