Advanced BASIC ROM User Guide

These forums are for community collaboration on archiving, magazine scanning etc. to avoid work duplication and agree conventions / define standards
Post Reply
User avatar
Posts: 207
Joined: Mon Jun 22, 2009 9:07 pm

Advanced BASIC ROM User Guide

Post by dv8 » Mon Oct 09, 2017 10:03 am

Attached is an OCRed and re-typeset copy of The Advanced BASIC ROM User Guide by Colin Pharo.

The zip file also includes an SSD containing all the listings in the book.
(263.09 KiB) Downloaded 182 times

User avatar
Posts: 2031
Joined: Tue Apr 09, 2013 11:30 pm
Location: Doomawangara

Re: Advanced BASIC ROM User Guide

Post by lurkio » Mon Oct 09, 2017 9:05 pm

Great book, outstanding digitisation!

=D> =D> =D>

User avatar
Posts: 2028
Joined: Sat Mar 10, 2012 12:05 pm
Location: New York, New York

Re: Advanced BASIC ROM User Guide

Post by sweh » Thu Oct 12, 2017 1:24 am

I learned so much from this book! I'm pretty sure it almost cost me an "A" in Computer Studies at O Level.

See, there was a section on how floating point numbers were stored. And after the teacher went through the lesson I said "this is wrong; what you've described is _fixed point_ numbers. There's always 3dp in your examples". Next week she came back and said "yes, you're right".

Roll forward... and the o-level exam had a question on floating point numbers. And so, of course, I used exactly how the Beeb stored numbers (based on this book) and not the incorrect lesson.

Final grade was a "B". Huh. So we paid to get the exam re-marked. I got an "A" with the comment "The student provided an alternate but correct answer to the question".

30+ years later and I'm still convinced the official exam was wrong on floating point numbers!

And much kudos for the excellent quality PDF.

Posts: 1208
Joined: Mon Jul 25, 2016 11:05 am

Re: Advanced BASIC ROM User Guide

Post by Coeus » Tue May 15, 2018 4:58 pm

Indeed, thanks dv8.

On the question of the floating point numbers it reminds me that when we did computer studies at school a few of us in the class were familiar with microprocessors and microprocessor assembly language whereas the course was probably based on mainframe computing. The one I remember was an example assembly language for some fictional computer which had a multiply instruction and I remember thinking "not on anything I've seen - usually you have to write a subroutine for that".

I wonder how much floating point was used on mainframes. Probably not at all in most COBOL programs. Maybe in FORTRAN. I also wonder if there was confusion by assuming that real numbers were held in floating point form. Of course they could be, a microprocessor BASICs generally did, but fixed point (scaled) representations would have also been practical for some applications.

Posts: 15
Joined: Fri Dec 09, 2011 9:56 am

Re: Advanced BASIC ROM User Guide

Post by thearttrooper » Tue Apr 16, 2019 7:24 pm

I wanted to echo the comments congratulating you on the quality of the the production.

Post Reply