APPLICATIONSDIVERS ★ Tearaway: The Informer ★

Tearaway: The InformerApplications Divers
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Tearaway could easily be described as THE hackers utility. Designed to be used with the Multiface II this is the only alternative to the awful INSIDER, in fact it's what insider should really have been. When installed, a bit of Tearaway sits inside the Multiface, and the rest of the code sits in the CPC's extra RAM. Obviously this limits hacking to 64k only games, but this is only a slight niggle.

What makes this program really stand out is its power. And this is what makes it also attractive to the hacker. For instance it's one of the few (maybe even ONLY!) disassemblers that recognise the Z80 undocumented opcodes, that are used in the most popular protection systems. This means that code that looks like gibberish when viewed with another assembler suddenly becomes altogether Tearaway could easily be described as THE hackers utility. Designed to be used with the Multiface II this is the only alternative to the awful INSIDER, in fact it's what insider should really have been. When installed, a bit of Tearaway sits inside the Multiface, and the rest of the code sits in the CPC's extra RAM. Obviously this limits hacking to 64k only games, but this is only a slight niggle.

What makes this program really stand out is its power. And this is what makes it also attractive to the hacker. For instance it's one of the few (maybe even ONLY!) disassemblers that recognise the Z80 undocumented opcodes, that are used in the most popular protection systems. This means that code that looks like gibberish when viewed with another assembler suddenly becomes altogether operate. Instead, when it needs a code module it'll load it off the disk. Unfortunately the loading system was so unreliable, that it would work an average 3 times out of 10. Because of this, and many other niggles, (like a 2-inch high editing screen!), once you've seen both programs working side by side, there really is no comparison to be made. So we won't, eh?

Onto the menu options then. From the main menu, where you can do all sorts of really wicked things, as I mentioned earlier, one if its most powerful attributes is the Disassembler, and another very important one is the Unique NULL BYTE SEARCH option. This is an absolute boon for hackers,, because infinite lives, etc. can be discovered with a minimum of ease. For example, an infinite lives routine may work as follows:

Assembler

LD A,3
LD (&3004),A
«Rest of program»

Machine code

3e,03
32,04,30

Comment

;number of lives
;&3004 stores lives counter

The life counter may work as such
LD A,(3004) 
DEC A
CP &00
JP Z,&4002
LD (&3004),A
JP &2000
3a,04,30
3d
fe,00
c2,02,40
32,04,30
c3,00,20
;get the lives counter
;a=a-1
;is A zero (no more lives?)
;yes, then jump to end of game routine
;no, then save new life counter
;and jump to main loop of game

With Tearaway , you would set the NULL byte option to zero, and search for the bytes : 3a,00,00,3d,00,00, which would search for all occurrences of those byte values, no matter what the locations with #00 were filled with. Very clever, and very surprising that no-one else has thought of this idea.

CPC ATTACK

★ PUBLISHER: CPC Network
★ YEAR: 1991
★ CONFIG: AMSDOS + 128K + MULTIFACE 2
★ LANGUAGE:
★ LICENCE: COMMERCIALE
★ AUTHORS: James Verity & Mark Riley
★ PRICE: £12.50.

★ AMSTRAD CPC ★ DOWNLOAD ★

Files:
» Tearaway  v0.3eDATE: 2015-08-09
DL: 27 fois
TYPE: ZIP
SIZE: 56Ko
NOTE: 40 Cyls
.HFE: OUI

» Tearaway  v0.4e-CPC  NetworkDATE: 2013-09-03
DL: 27 fois
TYPE: ZIP
SIZE: 89Ko
NOTE: CPC Network have released the latest version of Tearaway, THE utility for Multiface owners. Tearaway is able to hack into any 64K program and once in, you can disassemble the code, search for lives in a game, display full system information, view memory and even send output to your printer. ; 40 Cyls
.HFE: OUI

Advert/Publicité:
» Tearaway    ENGLISHDATE: 2018-09-18
DL: 10 fois
TYPE: image
SIZE: 87Ko
NOTE: Uploaded by hERMOL ; w848*h364

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L'Amstrad CPC est une machine 8 bits à base d'un Z80 à 4MHz. Le premier de la gamme fut le CPC 464 en 1984, équipé d'un lecteur de cassettes intégré il se plaçait en concurrent  du Commodore C64 beaucoup plus compliqué à utiliser et plus cher. Ce fut un réel succès et sorti cette même années le CPC 664 équipé d'un lecteur de disquettes trois pouces intégré. Sa vie fut de courte durée puisqu'en 1985 il fut remplacé par le CPC 6128 qui était plus compact, plus soigné et surtout qui avait 128Ko de RAM au lieu de 64Ko.