Search found 11 matches

by zxade
Fri Nov 15, 2019 8:51 am
Forum: Games/Software
Topic: What are the "lost" Ultimate arcade games?
Replies: 18
Views: 899

Re: What are the "lost" Ultimate arcade games?

Sleuthing is fun. I did some searching through the roms: Vortex AHMBPUERS LSATT C:CJHORHIN"C which is probably nothing, really. Apparently there are two developer credits, interleaved, in the main CPU at 0x47D8: JOHN LATHBURY CHRIS STAMPER You can probably see that if you rearrange those groupings ...
by zxade
Wed Sep 11, 2019 8:01 am
Forum: Showcase your work!
Topic: "Go-Go BunnyGun", first screen grabs.
Replies: 123
Views: 11850

Re: "Go-Go BunnyGun", first screen grabs.

but then I could use screen paging, not stack copying, to update the display. I've not used screen paging on the 128K before, and wonder if I've been missing a trick. How does it work in practice? Does it make it more tricky in terms of structuring the code? Do you lose the use of addresses from $C...
by zxade
Tue Aug 20, 2019 8:53 pm
Forum: Programming
Topic: IM2 corrupting stack-based redraw
Replies: 9
Views: 647

Re: IM2 corrupting stack-based redraw

Hmmm, that would be clever, I'll possibly experiment to see what it would take to try to implement something like this. I guess it explains why so many commercial games opted for using the simpler multiple LDI copy method.
by zxade
Mon Aug 19, 2019 8:26 am
Forum: Programming
Topic: IM2 corrupting stack-based redraw
Replies: 9
Views: 647

Re: IM2 corrupting stack-based redraw

If you choose to keep interrupts enabled, you can sometimes work around the stack corruption by having the IM2 handler back up SP, set it to a safe area, and restore it before exiting. The interrupt routine does save the SP and point it elsewhere before saving registers prior to playing the music. ...
by zxade
Sun Aug 18, 2019 10:48 pm
Forum: Programming
Topic: IM2 corrupting stack-based redraw
Replies: 9
Views: 647

IM2 corrupting stack-based redraw

I'm developing a game which uses a scrolling screen area and a back buffer. I want to use an area of 24x24 chars and have been experimenting to see how quickly I can transfer the buffer to the screen. I have a fast method which uses the stack, popping data from the buffer and pushing it to the scree...
by zxade
Fri May 31, 2019 9:29 am
Forum: Games/Software
Topic: Trying to identify a game
Replies: 9
Views: 590

Re: Trying to identify a game

One thing that grabs me is that the inertia on this game feels really good for a game of this era. The speeding up and slowing down are well implemented and feel right for this type of game. The main vehicle and enemies continue to move smoothly even when you go near to the side of the screen and th...
by zxade
Fri May 31, 2019 8:20 am
Forum: Games/Software
Topic: Trying to identify a game
Replies: 9
Views: 590

Re: Trying to identify a game

Hurray! yes that's it!! thanks Alessandro , 'Mask' by Gremlin Graphics https://spectrumcomputing.co.uk/index.php?cat=96&id=3042 So it's not a new game after all, nor from our Eastern European buddies, but a quality looking one nevertheless that I somehow never played back in the day. There's a great...
by zxade
Fri May 31, 2019 7:54 am
Forum: Games/Software
Topic: Trying to identify a game
Replies: 9
Views: 590

Re: Trying to identify a game

Thanks for the ideas R-Tape but it's very much a live action rather than strategy type game so not Stonkers or similar games. Just took a look at Komando II which I hadn't seen before and it's got a similar style of look except you drive a jeep or vehicle of some kind around. The scrolling precision...
by zxade
Thu May 30, 2019 9:00 pm
Forum: Games/Software
Topic: Trying to identify a game
Replies: 9
Views: 590

Trying to identify a game

I'm desperately trying to identify a spectrum game I watched someone playing live online recently but after an exhaustive search on google and many other places I've not been able to track it down to find out what it is called. Visually it looks a bit like the spectrum versions of jackal/ikari warri...
by zxade
Tue May 14, 2019 7:49 am
Forum: Brand new software!
Topic: New Software 2019
Replies: 188
Views: 31876

Re: New Software 2019

Yep, thanks @PROSM that was indeed the problem. I was on version 9.0 upgraded now to version 19.0 and it handles these RAR file ok now.