Spectrum Computing

Funnily enough I was reading the thread yesterday about the poor rendition of OMD's Enola Gay and it reminded me of Knockout.

Theres a recent remake of it and the graphics are similar.

I just cant think of its name...

EDIT: Here it is, Smudge - Bad Moonee Rising

https://spectrumcomputing.co.uk/entry/3 ... nee_Rising

Is it the remake of Smudge and the Moonees?

What is it called?

Nice one!

This turns it off, but what turns it back on?

Can ULA+ palates be switched on and off using a simple OUT command from machine code?

Or do you have to load all the data back in?

Try this:

Most sports games had a 2 player option, Match Day etc. Then there were Bruce Lee/Beach Head 2 type affairs that didnt really offer much besides making it easier to progress with an empty joystick instead the CPU haranguing you. But Rampage's 3 player option always sticks in my mind if only for the ...

Is that Molecule Man?

Nice one!

When I first seen the title I thought it would be yet another JSW/MM rehash, but this makes a refreshing change.

Not like me to do a CLEAR before I start proceedings but I clearly forgot this time.

I seem to have remedied the situation by re-assembling the code from scratch. No stack issues now, must have been something going on earlier in development. Edit: The stack is now at 24758. I'd done a clear 24799 then loaded the binary code dump in and everything now works fine. Why was the stack un...

Would popping the registers off the stack between levels help?

How do you set SP from machine code?

Stack - 65300, so theres the problem.

Any easy way of remedying the issue or will my data have to be shifted lower down?

From reset there is data just before 65368, 40 bytes to be exact.

What is it, and does it expand in size?

I have data stored just below this address and something is corrupting it.

Could it be responsible?

10 lines?

Gonna have to check this out.

ketmar wrote: ↑Wed Apr 10, 2024 6:11 am more than enough! "LD" alone occupies about 1/3 of the whole non-prefixed instruction set!

True.

Excuse my coding, it was written over thirty year ago on graph paper in a maths lesson. :-) I've never got round to modifying that bit of the code although the rest of the game code isnt much better either. My coding skills are quite shocking, I doubt I know how to use any more than twenty Z80 comma...

I'm still a bit flummoxed with the bits not working - perhaps the 254 part has something to do with it? This is what I use on the title screen to load Kempston values into the game code: kempston ld a,31 ld (js1+1),a ld (downx+4),a ld (upx+4),a ld (leftx+4),a ld (js2+1),a ld a,3 ld (stickup+1),a ld ...

Cheers Tom, I'll have a play around with that routine.

Ah right, I realised why I never bothered with Kempston, if no Kempston is present IN31 automatically reads it as fire being pressed.

That means the game starts automatically with Kempston controls even though no Kempston is connected.

Theres also this part:
Perhaps the 254 needs to change?

Tried this but it wont work, character just keeps moving right. kempston ld a,31 ld (js1+1),a ld (downx+4),a ld (upx+4),a ld (leftx+4),a ld (js2+1),a ld a,3 ld (stickup+1),a ld a,2 ld (stickdown+1),a ld a,1 ld (stickleft+1),a ld a,0 ld (stickright+1),a ld a,4 ld (js3+1),a ret

How do you go about supporting Kempston joystick in games? I think its IN 31 but I haven't a clue about the up/down/left/right/fire bits. This is the routine I use for Sinclair (I think it will make sense), how would you adapt it for Kempston? Sinclair ld a,239 ld (js1+1),a ld (downx+4),a ld (upx+4)...