[Coco] DECB USRn function?

[jdaggett at gate.net]

On 24 Jul 2006 at 22:54, Mark McDougall wrote:

> Robert Gault wrote:
> 
> > It is easy to find INTCNV and the inverse GIVABF plus other useful 
> > routines by looking in the "Basic Routines and Entry Points" appendix.
> 
> Yup, thanks, I've had a bit more time and from looking at the disassembly in 
> 'Unwravelled' I worked out that the argument is passed in FPA0. Then, 
> looking at the section on "Floating Point" I found INTCNV and GIVABF.
> 
> Thanks for those references though - no doubt they'll come in useful!
> 
> It's frustrating because I'm trying to do some fast bit-manipulation in a 
> BASIC program, and I turned to ML to speed things up, only to find that 
> BASIC has no concept of INTEGERS and passing values to/from ML is rather 
> *S*L*O*W* because of the INTCNV/GIVABF routines... :(
> 
> Regards,
> 
> -- 
> |              Mark McDougall                | "Electrical Engineers do it
> |  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"
> 
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***************
Mark

You are correct, most if not all the RSBASIC math is done is floating point. 
Yes definitely slow when you are expecting speed. There is a 16x16 
unsigned multiply routine at $9FB5 that is entered with the two integers in D 
and X and returned with the result in Y and U. But that seems to be all the 
integer math that I am able to find.


james