> -----Original Message-----
> From: Florent Pillet [SMTP:[EMAIL PROTECTED]]
> Sent: Friday, April 07, 2000 3:35 PM
> To: Palm Developer Forum
> Subject: Re: prc-tools v2 an multisegment
>
> on 27/03/00 6:52, Chris DiPierro at [EMAIL PROTECTED] wrote:
>
> > Someone asked me if I had multiple definitions of the function I was
> having
> > problems of. I DID! Aha I thought as I got rid of the multiple
> definitions.
> > So I got rid of the old definitions and tried again.
> >
> > Now I get the following:
> >
> > "It performed a 'line 1111 instruction'. ..."
> >
> > A line 1111 instruction??? What the heck is that!?
>
> For a bit of history, line 'F' instructions (2 bytes, beginning with the
> bit
> sequence 1111) were originally reserved for accessing a math coprocessor.
> Since the original 68k did not have floating point support, engineers had
> reserved this range of opcodes for math instructions (if I remember well,
> there is a CPU like the 68881 which may provide the instructions that fit
> in
> the 'F' line, but I can't say more without looking at the manuals :-))
>
> --
> Florent Pillet, Code Segment [EMAIL PROTECTED]
>
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>
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>
That's correct. When the high nibble is set to 15 (F in hex or 1111
in binary), then the math coprocessor would take over. If its not
available, a 68K trap is executed which allows for software emulation of the
floating point. If the trap could be set and the code kept around, this
would be one way to implement floating point on the Palm, but I don't know
if this is even possible or not.
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