ColecoVision Defender - Hyperspace Patch 🕹🚀💥👾📺

[HowdyThere]

Help (please).

 

I’ve looked and looked but can’t find a (patched) CV Defender ROM that’ll work properly on emulation.

 

I’m talking about the pesky Hyperspace button (Button 0 / Zero). 
 

All emulation (that I have access to, on handhelds and devices without a keyboard) cannot map the CV keypad’s 0 / Zero button… 1 to 8 can be mapped, but not 9 or Zero

 

Would be great if a patch / patched ROM existed that remapped the Hyperspace button to something else … Defender (for CV) is IMO the very best home port of the arcade game, and up there with the best games on the CV.

 

But the game feels incomplete as I can’t escape when the going gets tough and I’m all out of smart bombs.

 

Is there a ROM / patch out there that’ll ‘fix’ the controls ?

 

Thanks in advance / anticipation.

Edited November 16, 2022 by HowdyThere
Improved title

[Bruce Tomlin]

Just a guess from a quick search of a disassembly, the byte at B2BA is 05h, which might be checking for the zero key. The eight key would be 0Eh.

[HowdyThere]

Button 8 would work

 

Would be great if a patch could be spun up to trial this (unfortunately I’m a database guy, if this could be fixed with SQL I’d have a bash myself).

 

I doubt it’ll improve my high score but it’ll feel more like a complete game

 

 

[HowdyThere]

Like an eager yet blundering fool with a wrecking ball I’ve had a go at ‘fixing’ the ROM … and it worked! 🎉 

 

My workings out:

 

1) Uploaded the original ROM to an editor: https://hexed.it/

 

2) Worked out the address to locate: B2BA - 8000 = 32BA

 

3) Swapped 05 to 0E

 

4) Saved the renamed ROM (attached)

 

Massive shout-out and thank you to Bruce Tomlin 👍🏼

Defender Hypersp8ce.col