Scoopex releases....

Galahad/FLT · 10 June 2017, 14:29

....Zoom! from Discovery Software.

This is a game from 1988 that was never properly cracked, maybe out of respect to the guys involved, but now that has been rectified.

Tested on a real A500 and in WinUAE, game operates as it should.

Thanks to Barry for the MFM image of the game.

Game had some very nice copy protection ideas, was a worthwhile challenge.

All decryption and self modified code has been removed, and game *might* now work on other machines other than 68000.

Its in the zone by the way

nobody · 10 June 2017, 14:59

I had a version that was like a pre-release, with poor graphics and was much different than this one. This has better sprites, better panel and colors, and intro.

DamienD · 10 June 2017, 20:43

Thank you sir Galahad

I mean, being a WinUAE user I just use .IPF file

...but this is very cool for real Amiga users and from what you've said, you put a bit of work into this.

Hats off to you my friend

ross · 10 June 2017, 20:55

Quote:

Originally Posted by Galahad/FLT

and game *might* now work on other machines other than 68000.

Hi Galahad tested in WinUAE: fail from A500+ and up.

(kudos for the works!, intriguing protection)

Bye,
ross

E-Penguin · 10 June 2017, 21:11

Just out of interest, what were the copy protection mechanisms?

TjLaZer · 10 June 2017, 21:12

Seems to run on NTSC fine, thank you

Galahad/FLT · 10 June 2017, 21:14

Quote:

Originally Posted by ross

Hi Galahad tested in WinUAE: fail from A500+ and up.

(kudos for the works!, intriguing protection)

Bye,
ross

Yeah i wasnt confident it would work on anything above a500 1.3, old game written in C and not respecting anything beyond that.

ross · 10 June 2017, 21:17

Quote:

Originally Posted by E-Penguin

Just out of interest, what were the copy protection mechanisms?

Various levels of encryption code, illegal opcode, self modifying code, a strange track..

Galahad/FLT · 10 June 2017, 21:19

Quote:

Originally Posted by E-Penguin

Just out of interest, what were the copy protection mechanisms?

MFM disk format, encryption, self modifying code that sneakily setup variables in key parts of memory, protection track read which also built up a special table in memory which meant game would not work without and checksums.

And the game code was written in C and it was VERY tight on memory to find space for loaders.

Asman · 10 June 2017, 21:41

Great! I just saw only cracktro, because I love cracktros. And I like it. Nice. Respect.

DamienD · 10 June 2017, 21:51

Quote:

Originally Posted by Asman

Great! I just saw only cracktro, because I love cracktros. And I like it. Nice. Respect.

I'm with you on this one; me loves cracktro

...and this is enough reason for me to ditch the .IPF and use this .ADF with cool cracktro

E-Penguin · 11 June 2017, 19:00

Quote:

Originally Posted by Galahad/FLT

MFM disk format, encryption, self modifying code that sneakily setup variables in key parts of memory, protection track read which also built up a special table in memory which meant game would not work without and checksums.

And the game code was written in C and it was VERY tight on memory to find space for loaders.

Good effort. Self-modifying code is a bit of a mind-bender on its own!

kamelito · 11 June 2017, 20:11

Thanks
Kamelito

BarryB · 11 June 2017, 22:59

This release is now in the same folder as my original release

10 June 2017, 14:29	#1
Galahad/FLT Going nowhere Join Date: Oct 2001 Location: United Kingdom Age: 50 Posts: 8,986	Scoopex releases.... ....Zoom! from Discovery Software. This is a game from 1988 that was never properly cracked, maybe out of respect to the guys involved, but now that has been rectified. Tested on a real A500 and in WinUAE, game operates as it should. Thanks to Barry for the MFM image of the game. Game had some very nice copy protection ideas, was a worthwhile challenge. All decryption and self modified code has been removed, and game might now work on other machines other than 68000. Its in the zone by the way

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10 June 2017, 14:59	#2
nobody Registered User Join Date: Dec 2013 Location: GR Age: 46 Posts: 1,416	I had a version that was like a pre-release, with poor graphics and was much different than this one. This has better sprites, better panel and colors, and intro.

10 June 2017, 20:43	#3
DamienD Banned Join Date: Aug 2005 Location: London / Sydney Age: 47 Posts: 20,420	Thank you sir Galahad I mean, being a WinUAE user I just use .IPF file ...but this is very cool for real Amiga users and from what you've said, you put a bit of work into this. Hats off to you my friend

10 June 2017, 21:11	#5
E-Penguin Banana Join Date: Jul 2016 Location: Darmstadt Posts: 1,213	Just out of interest, what were the copy protection mechanisms?

10 June 2017, 21:12	#6
TjLaZer Registered User Join Date: Sep 2004 Location: Tacoma, WA USA Age: 52 Posts: 1,915	Seems to run on NTSC fine, thank you

10 June 2017, 21:41	#10
Asman 68k Join Date: Sep 2005 Location: Somewhere Posts: 828	Great! I just saw only cracktro, because I love cracktros. And I like it. Nice. Respect.

11 June 2017, 20:11	#13
kamelito Zone Friend Join Date: May 2006 Location: France Posts: 1,801	Thanks Kamelito

11 June 2017, 22:59	#14
BarryB Amigaholic Join Date: Dec 2009 Location: UK Posts: 4,676	This release is now in the same folder as my original release

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