Search found 149 matches

by polka
Fri Jan 06, 2012 9:20 am
Forum: Software & Programming
Topic: Floating Point Numbers
Replies: 25
Views: 11416

Re: Floating Point Numbers

The only real way of getting a truly random number without a battery backed clock, is for the program to include a prompt for the user to press a key before the RANDOMISE command And why not a prompt asking the user to enter the actual date ? Then you would have a "user backup'ed clock" Q...
by polka
Thu Jan 05, 2012 11:40 pm
Forum: Software & Programming
Topic: Floating Point Numbers
Replies: 25
Views: 11416

Re: Floating Point Numbers

Let's be simple : why does it have to be counting milliseconds ? any short time intervals will do ! So suppose that when powering up your QL you start a very tiny job written in assembler that just increments continually a 16bit or 32bit counter as fast as it can (only a couple of machine codes, I g...
by polka
Thu Jan 05, 2012 11:38 am
Forum: Software & Programming
Topic: Floating Point Numbers
Replies: 25
Views: 11416

Re: Floating Point Numbers

C68 also handles the translation between IEEE doubles and QDOS FP format when callng graphics routines (which are the most important ones in QDOS where floats are involved) Thank's, this is really the answer to THE question I was wondering about. An alternative could have been that the math library...
by polka
Wed Jan 04, 2012 12:31 am
Forum: Software & Programming
Topic: Floating Point Numbers
Replies: 25
Views: 11416

Re: Floating Point Numbers

Floating point in Qdos is to my opinion a very "dark" issue : QL floating point arithmetic uses 6bytes numbers with 2bytes for exponent and 4bytes for mantissa. This is the rule when you write programs with SuperBasic, and also for instance when you use the "floating point extensions&...
by polka
Wed Dec 21, 2011 7:55 pm
Forum: Hardware
Topic: QL Drives on BBC Model B
Replies: 8
Views: 4106

Re: QL Drives on BBC Model B

Nothing hardware related, I guess... just a REM :

if the BBC basic on this machine is like the one I have on my ZX88, then I like much better QL's SuperBasic.

Paul
by polka
Mon Dec 05, 2011 5:32 pm
Forum: Hardware
Topic: Using Microdrives Today
Replies: 20
Views: 9901

Re: Using Microdrives Today

What I noticed : often the tapes will not read because the very little pressor pad is worn out and the tape is not continuously touching the magn. head. You may by "microsurgery" replace the original pad with "felt" cut off the "lips" of 135 film cartriges (if you still...
by polka
Wed Nov 23, 2011 12:16 pm
Forum: General QL Chat
Topic: My two QLs' serial numbers ?
Replies: 8
Views: 4164

Re: My two QLs' serial numbers ?

OK, now I see it : J4 ISS6 1984 J4-ISS6.jpg What does it mean ? stable version ? in relation with the serial number on the case ? I find thus that Sinclair had a very relaxed view of serials ! If there is no unique serial # on the PCB (only a version/release sign) and the serial # on the case has no...
by polka
Tue Nov 22, 2011 12:10 pm
Forum: General QL Chat
Topic: My two QLs' serial numbers ?
Replies: 8
Views: 4164

Re: My two QLs' serial numbers ?

On which side of the PCB is it ? On the side you see when just removing the keyboard (component side) I saw nothing printed, is it on the other side ? Or else, where exactly should I look ?

Bye, Paul
by polka
Sun Nov 20, 2011 7:20 pm
Forum: Help for New Users
Topic: End of unzip woes?
Replies: 13
Views: 9027

Re: End of unzip woes?

For me, it worked nicely , because I am a keeper and still use Windows XP on my PCs : fortunately, may I say, because my QL floppy drive does read/write only DD discs. Also : for the moment I did try it only with the very old PC that I received from my daughter, which still has an internal 3"5...
by polka
Sat Nov 19, 2011 2:38 pm
Forum: General QL Chat
Topic: My two QLs' serial numbers ?
Replies: 8
Views: 4164

Re: My two QLs' serial numbers ?

Yes thank you Rich, that's what I thought.

Is there a serial or model number somewhere to be found on the circuit boards proper ?

Bye, Paul