Spectrum Computing

Yeah exactly that. It's super easy to write an 8x8 draw a sprite aligned to a character cell which is what that engine seems to be doing. Also the collision detection is easy as well! You can get an 8x8 sprite moving under keyboard control easily and it will be so fast you need to either slow it dow...

Why not do cp 'A' ; cp 'A' :geek: which works on every assembler I have used (although you still developing on the speccy?) EDIT: Obvs that will work you're literally using cp '=' and stuff already ;) EDIT2: All assemblers I have used also support stuff like cp 'Z'+1 although that may not be support...

Galaxian obviously has too much going on at once to run at 50fps on a Speccy unless you can cheat and only update a few alien positions per frame (maybe it does that not seen a video of it recently, not sure if Galaxian had sprite hardware or not? I know it also used a Z80 though). I was going to tr...

I watched a couple of them, they are good. I was thinking it probably would be a good idea to implement the movement at the arcade res and have lookup tables for row/column to output the sprites, you probably only need a lookup table for the row and the column transform unless I'm missing some compl...

Also, are you simulating the gameplay at the arcade resolution/speed of movement and then adjusting the output positions to fit the speccy screen or are you doing all the movement and collision in the native speccy resolution? EDIT: Also the screen clear was nice how it did a horizontal wipe over a ...

Nice (bit juddery though maybe that's youtube or the music uses a lot of frame time in which case probs limit the frame rate to make it smooth).

There's at least 1 other cutscene but not many people get to see it where the ghost snags its sheet on a nail IIRC.

Yup that's how I started as well, excellent pdf that. Although it does irritate me that he uses x, y for row, column but that's just me being a pedant - although it does remind you that you should think about your variable names (row, col would be a bazillion times better). He goes on to some advanc...

Oh ok weird probably wanted to remove the publisher then I guess so no idea why he would reverse it then

Probably reversed it because they wanted Alphabatim in the bottom right corner (probs so the end of the m forms part of the border... colour change to yellow is a bit crap though) and they'd have to erase the debris on that side if they didn't flip it. They also cleaned up the title text and the bor...

Ok I looked at the wikipedia page looks like there are no flippers only bats and most of the walls are either 90 or 45 degrees so that simplifies stuff quite a bit. I expect there's no gravity either which makes things a lot easier (mainly calculating when the ball hits something which gets harder w...

Yeah see my edit at least do breakout first flippers and bumpers are quite physics/geometry intensive. Bumpers usually elastic as well so the incoming velocity does not equal outgoing velocity. EDIT: Don't just do reflection off the bat though make it only reflect in the middle of the bat make bounc...

Pinball is pretty hard physics wise though you need a good set of line/circle collision stuff so probably easier to stick to something simple first, like a 2d platformer (with no scrolling at first that's hard too). You'd probably need to do the maths for pinball in something like 16 bit fixed point...

If I was going to use a backbuffer with dirty cells list these days I'd store 1 bit per 16x8 pixels though rather than 8x8 pixels and use the stack to copy. I also turned the dirty cells list into an array of cells to copy which I did at the end of the frame and redraw the parts that needed updating...

Yeah you'll always end up with a better engine if you code stuff yourself since you can customise it rather than using something which has to cope with anything that can be thrown at it. Precision collision detection isn't that hard as long as you don't check everything against everything else you a...

At least the temperature conversion program got the formula right unlike the one which estimated the ellipse perimeter

Yeah that looks like a good link. I already have it so I didn't try downloading it again.

Not sure if that link is correct, dropbox made me sign up with my new email but even then if I click link it says I shouldn't be there or something, maybe it's a private link? Dropbox kind sucks though. EDIT: Yeah it's sent me a spam email after signing up it's annoying :( google drive is a lot bett...

I got it from here I think but it's warning me about an insecure download (I thinks it's probably fine though)

http://freestuff.grok.co.uk/beepola/

EDIT: Hmm that's the same site it just says insecure popup blocked in Chrome but I think if you say keep it is fine.

Neither of those links don't work for me. EDIT: If I remove the torinak thing from the start though it just downloads a TAP file, so maybe the link is wrong. Links I posted do have https in I think, they don't work either. It used to work fine until recently and I haven't touched my settings or anyt...

I tried Brave browser as well, does not work for that either, so it's either my local internet settings or my ISP (I also have problems with some links on the site not working as well which I think is an ISP thing). Never mind then I will just download TAP files I guess and use Spin, or else use JSS...

Hmm ok it doesn't work for me :( It never loads the page. Maybe something to do with my browser I suppose (although it's just Chrome). The first link on that page sends me to https://spectrumcomputing.co.uk/playonline.php?eml=2&downid=8850 which then never completes loading. SJOE link takes me t...

Yup that's me obvs (same icon and everything)

There was a topic on this but it was closed.

I dunno if it's anything to do with this site or if QAOP is completely external but it doesn't seem to want to load anything again (never loads the page).

QAOP is miles better than JSSpeccy since the beeper timings are all messed up with that.

This is where I got BeepFX from I remember it being quite hard to find the link for it originally. https://shiru.untergrund.net/software.shtml Looks like they (Shiru) also have a tool to convert Beepola file format to AY as well which may be of use for you AY guys who want to use same tune for 48K a...

I don't use an existing engine (except for music and SFX obvs) so don't know about its interoperability with any of those. I assume it isn't too hard to get working with z88dk using C though, you may have to replace the ISR I guess. For BeepFX you also get the source code so I removed any functional...