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Works a treat, excelent app. I had a minor issue with the folder I used to transfer over from PC to phone that meant the app crashed and the only thing I could think of was the directory name was either too long or had spaces in it. I changed it to Oric and no problems since. By far the cheapest way...

That code for subtraction looks correct to me (not that I am any expert). I dont know if there is any faster way though. As for setting the carry flag, from whatr I understand it goes like this :- Consider a simple subtraction of X= 5 - 3 The way the processor handles subtration is actually via an a...

Have a great christmas everyone and best wishes for #7E3

I can confirm Symoon's answer is correct.

In basic you can just do :-
POKE 0,PEEK(#308)AND3

and in assembly

lda $0308
and #$03
sta $00
rts

If anyone is interested here is an update. Improved graphics. Soundtrack player added. The beginning of a storyline for this and future levels. Still a lot of bugs to iron out, but getting there slowly. I have ideas for the next 2 or 3 levels maybe more. The redefine chars scrolling method was tried...

Excellent, thankyou both. It seems I was on the right track but not quite there or as a famous comedian once said about his piano playing, "I play all the right notes, just not in the right order" :D I wasnt expecting to produce the most optimised code at my first attempt. The reason for u...

A first exploration of assembly and already I have questions. I think its my brain not registering something correctly since the code below compiles and runs but does not give the results I was expecting. The code should plot a vartical column of charaters in column 37 of the text screen with the ch...

This is still under development, well more of a re-write to make it more modular as it was becoming un-wieldy. I have been taking on board the comments here and some are being worked on right away (improved scrolling for example), soundtrack player of some kind and probably the most important, the a...

Thanks Dbug. These little projects are my method of testing and converting things betweem languages. Most of the code is quick and dirty but is allowing me to figure out little routines that can be incorporated into a bigger project. I will gladly share and it maybe interesting for people to see how...

I decided to compare basic with c and what better way to do it than using the classic Space Invaders. The basic program is from a listing in "Meteoric programming" and is playable if a little slow. I then converted it using very dirty code, that could be tidied up somewhat given more time,...

I have recently purchased from Ebay a selection of books (9 Oric Specific and 1 6502 programming book). 2 of them would be very easy to scan as they ar not bound. They are a user manual for EAD65C by OPEL Ltd and a MiniText user manual also by OPEL Ltd. 2 Questions, 1) Would they be of interest to a...

Works perfectly.

I just figured out what I did to get the sedoric commands working. I copied the sedoric.s (which had the _sedoric in it) into the scroller working directory and compiled with the c program. This should have triggered in my brain that I should be able to do the same with the music player.... but it d...

Thanks, I'll give that a try

Dbug wrote Basically the whole "sedoric" invocation is kind of wonky (and by the way, how did you get it to work, I had to add some lines to my library.ndx! -sedoric.s _sedoric I dont remember having to change the library files and when I looked the _sedoric was already there (although I c...