Re: Integer Basic integers

[datajerk <datajerk@gmail.com>]

On May 1, 9:05 pm, Chris Beall <Chris_Be...@prodigy.net> wrote:
> datajerk wrote:
> > Is there a hack, tip, or trick to get Integer Basic to use 0 - 65535
> > for the integer range instead of -32768 - 32767.  I would expect 255 *
> > 256 to produce a negative number instead of an error.
>
> > Thanks.
>
> The short answer is: no.
>
> The Integer Basic multiply routine starts at E222.  It jumps around to
> subroutines elsewhere in the ROM.
> The instructions you care about occur at the bottom of
> the multiply loop:
> E23F-   10 E4      BPL $E225      Has the result exceeded the limit?
>
>                                      (If not, continue processing)
> E2411   4C 7E E7   JMP $E77E      Yes, display '>32767' error.
>
> Of course, there are other ways to get that error.  You would have to
> find and adjust all of them, and when you got done you would have a
> version of Integer Basic that could represent only positive numbers.
>
> Someone seems to have posted a source listing athttp://home.comcast.net/~mjmahon/AP1BASIC.txt
> but you have to supply your own comments.
>
> I think using the floating point Basic (AppleSoft?) would be easier.
>
> Chris Beall

Thanks for the info.  I assumed as much.

Yes FP basic would be easier, but much slower for my needs.