Hi Norman, Many years ago I wrote many Hyperbolic function based on The Advanced QL User Guide, by Dickens. All seemed to work fine.
The functions in the book only described the obvious functions, I needed some other fuctions for a mechanical engineeriong problem I did on the QL in Superbasic, for calculating beam deflections. Thjis actually worked quite well and I got my HNC in Mechanical Engineering. Derek On Fri, 22 Sep 2006 08:14:50 +0100 [EMAIL PROTECTED] wrote: > Morning Marcel, Wolfgang, > > Thanks for your replies. > > > Nope, that's where you differ with the documentation. First, the > > variable area is (A6,A4), typo I guess, and second, the opcodes > > $FF31 to $FFFF are for load/save, not $32 to $FF. Yes, the latter > > DO work, but it seems that's more an undocumented side-effect. > > Ok, A6,A1 was a typo, I meant A4 - apologies. On the other hand, my > QDOS Companion (Pennell) has the load/save parameters as $32 to $ff > and not $ff31 to $ffff as you state. > > I went on a doc hunt last night and Dickens has the negatives and my > QDOS docs from Jochen also has negatives - so Pennell is wrong. Oh > hum. > > Further to this, Dickens works out the actual address as (A6 + A4 + > (D0.W OR FF00) AND FFEE) while Jochen's docs (in my version) simply > has A6 + A4 + (D0.W AND FFFE) which looks like the correct verion - > as only bit zero is cleared and not bits 0 and 1 as per Dickens. > > > > Just look at the variable area as some kind of stack, with (A6,A4) > > pointing to the *top* of it. > > No problems with this now that I have the correct op code values. > > > > > > Now I had assumed that I could save one FP using code $32 and > > > another using op code $34 and so on, but the source appears to > > > indicate that I will overwrite part of my $32 saved FP with part > > > of my $34 saved FP. > > > > Well, you can store other things in the variable area too, so it > > makes sense that you can address every individual word there. > > > > Not with the LOAD/SAVE op code as far as I can see, they always take > 6 bytes from the A1 stack and load back 6 bytes. There is no way that > I can see (using the maths package) to load and save a word for > example. If I wanted to yuse the A4 stack as a general purpose buffer > for words and things, I can do it without the maths package - so it > doesn't make sense (to me). > > However, Dickens gives an example of the Hyperbolic Sine of a number > (SINH) and in it he saves and loads values. His op codes are -6 and > -12 for save_1 and save_2 - so obviously you *have* to use multiples > of -6 for your save locations to avoid overwriting other stuff. > > Not only that, but codes from -5 through to -1 will overwrite data at > the top of your A4 stack. > > > > > Cheers, > Norman. > > _______________________________________________ > QL-Users Mailing List > http://www.q-v-d.demon.co.uk/smsqe.htm > -- > This email has been verified as Virus free > Virus Protection and more available at http://www.plus.net _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
