Spectrum Computing

I suppose the situation I'm thinking about is wanting to do something AND return. Whereas you can only do one or the other using basic assembly commands.

Storing the location on a stack could be risky for creating bugs?

Putting the function pointer with the menu is a good idea, I'll have to study it a bit more though

I'll give it a go when I have time, looks good from the video I saw of it.

So you have cross compilation from PC to x86 dos system and zx spectrum?

Any .tap files of demos available of the games?

i suppose thts almost like creating a new language, but might be necessary for some complicated things. The most complicated things ive ran into so far were: if keypressed is_key_pressed=1 else if is_key_pressed=1 do_action() is_key_pressed=0 endif endif which in assembly is: call read_keyboard LD A...

thats an interesting way of using the stack, might have to use that later.

I am using bytes for state flags etc. and yes the second answer is correct for those types of situations. Like the movecharacterleft the situation where i use backwards logic is: see if the option chosen is the first - then execute it, if not then see if it is the second then execute that I jp acros...

in normal languages you can do an IF statement with multiple conditions quite easily, but assembly is a bit like having the memory of a goldfish..as registers get trashed all the time. So far, I have been doing things like:testing for the opposite of what im looking for and then skipping over code i...

nice website. my attention span has been destroyed by modern technology, but I managed to read 3 reviews

it's a 'mouse driven game' except using the keys to move the cursor. I played it on the spectrum just a few years ago. I think just clicking on that sword icon would work.

that's really interesting, i would be interested in the a.i. of course. It seems to be just seeking out the humans and shooting at them using the basics , line of sight, pathfinding etc. at a guess. I think someone else mentioned they tend to take notice of where the player's units have entered the ...

Thanks I'll check it out

ketmar wrote: ↑Sat Oct 14, 2023 1:16 am i always suspected that "H" flag was named after hentai… now i am absolutely sure it was.

ah that explains a lot

oh i see thanks, I was assuming that zero was in the middle, like at position 128 and -128 was in the zero position of a normal byte. So I thought that +128 was where 255 would normally be. I see how it is now lol one slight problem is CP because it would say 255 is bigger than zero all the time, ig...

It seems like negative numbers are stored with the eighth but representing the plus or minus sign. Negative numbers have zeroes installed of ones? The only time it would affect me is: if I set a number to zero in the assembler code with defb. Then I 'sub' 15. Is the answer --15 or 240? What if I wan...

Ah that makes sense. I'm trying to learn about signed vs unsigned. So inc and dec (not ant and dec) only seem to work in an unsigned way. That's straight forward. Whereas 'add'puts a bit in the carry if it goes over 255 . I still don't know how to handle such things. I had a skim through that book f...

Ah that's very useful that call and ret can have conditionals.
Now I can think about the IF statements with normal logic
Chibi and non chibi are good ways to remember it esp. With that chibia akumas bloke.

thanks, my game basically has the input style of a JRPG (but the comparison stops there) so im doing the 'react to keypresses' when the key is released. its just going to be menus like that for the whole game. It's probably the simplest game to program, just need to copy pointers to strings to other...

using assembler allows for better control, in some languages getting one movement per keypress is difficult.
Boriel for example needs a lot of halt instructions to be added

ok thanks both.

I just wondered how to define a constant in z80? I checked the manual for sjasm and the manual for urasm seems to assume familiarity with other assemblers.

Also how do you make a byte signed or unsigned?

Split by admin

what platform is dsForth for?

why make it a one-pass compiler, its already very fast. Won't it introduce new bugs?

They were able to get digital images into the spectrum ie those arcade conversions like mr.heli looked like poor quality importing of graphics.
But still screens were not profitable

utz wrote: ↑Tue Oct 10, 2023 10:16 pm mumble muble Turbo Rascal muble mumble...

Yeah I took a look at that,its mostly c64 focussed.

Okiedoke. Well I think you were working on reading the keyboard so have a look at this and read the comments in the code, should easily be adapted to your needs. thanks, this and the code to get the screen address from x and y are the only code that is not mine. Im not adverse to using other people...

I am writing them as I need them.