AW: Converting to and from FAC

From: Spiro Trikaliotis (Spiro.Trikaliotis_at_gmx.de)
Date: 2000-10-18 07:46:38

Hello,

> Does any one know how, of have a good reference for,
> converting floating
> point numbers to and from the 5-byte format used in the FAC
> and by all the
> Kernal routines?

A good reference is

Lothar English, Das Maschinensprachbuch für Fortgeschrittene, DATA BECKER
Verlag, approx. 1984 or 1985. Unfortunately, AFAIK, it's german only, so
I don't know if it's of interest for you.

If no one else answers, contact me again, and I will have a look into it
and explain it to you (although, I will not be able to do it before
starting November, because I'm 450 km away from the book...).

BTW, not all KERNAL routines use the same format: Some need the
"compressed" 5 Byte format, while others need 6 bytes (the sign is extra,
and the leading 1 is set in the remaining 5 bytes).

Or, possibly I can help you from the memory? Where exactly is your
problem? Don't you know how to convert a decimal FP number into binary,
or is it something specific to the commdores? I could explain the IEEE754
format, which is _nearly_ the same. Would that be of any help for you?

Or do you just need the function calls to convert the numbers? If so,
just assign them to a variable and read it from the variable's memory.

Best regards,
   Spiro.

--
------------------------------------------------------------------------
Spiro R. Trikaliotis            Otto-von-Guericke-Universitaet Magdeburg
Phone: +49 (0)391 67-12560                     Fakultaet fuer Informatik
Fax:   +49 (0)391 67-11161               Institut fuer verteilte Systeme
EMail: spiro@ivs.cs.uni-magdeburg.de   Echtzeitsysteme und Kommunikation
http://ivs.cs.uni-magdeburg.de/EuK/             PF 4120, 39016 Magdeburg
------------------------------------------------------------------------

-
This message was sent through the cbm-hackers mailing list.
To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.

Archive generated by hypermail 2.1.1.