Rocket Man - Commented Disassembly

Discussion about ZX80 / ZX81 Software
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Fruitcake
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Rocket Man - Commented Disassembly

Post by Fruitcake » Tue Jul 18, 2017 11:50 pm

A fully commented disassembly of Rocket Man from Software Farm is now available here allowing you to discover exactly how this classic pseudo hi-res game works.

And using this I have created a conversion of the game for the 48K Spectrum, which can be found here.

The conversion uses the original code re-assembled 16K higher in memory so that it clears the Spectrum's display file. The code has been patched so that whenever the ZX81 display file gets updated its contents are rendered into an equivalent image in the Spectrum's display file. This approach allows the Spectrum to run Julian Chappell's actual code to achieve an experience near identical to the ZX81 original.

A video of the converted game can be found on YouTube.

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sirmorris
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Re: Rocket Man - Commented Disassembly

Post by sirmorris » Wed Jul 19, 2017 7:53 am

Awesome! Now for the '80? ;)
--=== ZXpand+ ... A more moderner all-in-one upgrade solution for ZX81 ===--
* SD/MMC storage * 32K Hires-capable RAM * AY sound chip * Joystick port * Serial *
* BASIC enhancements - plug & play * Reset button * Auto-boot facility *

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Andy Rea
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Re: Rocket Man - Commented Disassembly

Post by Andy Rea » Sat Jul 22, 2017 12:06 am

cool stuff, i'll be taking a look at mazogs and 3dmonster maze too, this work must have took many hours thank you

regards Andy
6 x ZX81, 1 x TS1500 , 1 x +3e, 1 x timex 2040 printer, 1 x timex 2020 cassette deck, siclair printer and some spectrum

Fruitcake
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Re: Rocket Man - Commented Disassembly

Post by Fruitcake » Sat Jul 29, 2017 10:29 pm

Andy Rea wrote:
Sat Jul 22, 2017 12:06 am
cool stuff, i'll be taking a look at mazogs and 3dmonster maze too, this work must have took many hours thank you
Yeah it took a while... ;)

But fascinating to find out how these classic games work!

Fruitcake
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Re: Rocket Man - Commented Disassembly

Post by Fruitcake » Sat Jul 29, 2017 10:42 pm

A colour conversion of the game for use with a ZX81 and Chroma interface can be found here.

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