Spectrum Computing

Yeah it's tough!

The sprites look like straight copies to me, rectangular with no masking, and placed horizontally (at least) to 8-pixel character positions. A straight 'blit', if the Spectrum had a blitter chip! I can imagine roadblock signs working the same way; are the dust clouds like that too? Unmasked? I'm cu...

I can explain the "SHOCKED" text at $EE30. This is a cheat mode: redefine the keys as SHOCKED and you get a special cheat menu. By the way, it's odd to me that you put "© 1989 Ocean Software Ltd" at the bottom of your disassembly. Yes, they own the code, but your disassembly inv...

Here's the current disassembly output: https://dpt.github.io/ChaseHQ/index.html

The Great Escape has a delay loop you can disable: POKE 41109,201

See https://dpt.github.io/The-Great-Escape/asm/A095.html

It only affects indoor scenes though.

It's really not much of a slow down. They're just sprites however. If they were 'real' cars then I imagine the game would get bogged down quite quickly.

Busy roads today. Beep beep!



Not really, I've just replaced the 'dust' and 'stone' object with the Lambo.

I appreciated Carrier Command's extra music tape, and the 720 degrees soundtrack too.

Last Ninja 2 was supposed to arrive with a ninja mask and a rubber shuriken but my shuriken didn't show up in the box. Miffed.

D.

Ast A. Moore wrote: ↑Fri Mar 17, 2023 6:41 pm Hmm. I keep getting this on macOS 10.15:

Might be worth giving this a go:
https://stackoverflow.com/questions/545 ... eads-found

D.

Spec chums, I've started pulling Chase H.Q. apart. Hopefully I can find the time to reverse engineer it to a similar level as my disassembly of The Great Escape. It's early days so it's the 48K version first. So far I've mapped out the strings, a lot of the graphics and some of the routines related ...

And here's a video of me doing just that:



D.

Amazing stuff. I have it running on macOS now. I needed to make some small changes to get it going, which I'll feed back. I amended the graphics viewer to let me see Chase H.Q.'s back buffer. That combined with slowing the game down to a tiny percentage of its original speed lets me watch the screen...

I tried out --sim-load on a tape of Chase H.Q. last night and ended up starting another project... https://github.com/dpt/ChaseHQ

D.

Closest I can offer is "Cannonball": the reconstructed OutRun engine: https://github.com/djyt/cannonball/wiki

I discovered a Head Over Heels disassembly the other week on github which I'd not previously spotted: https://github.com/simon-frankau/head-over-heels