Cracked Alien Storm - Page 2

BippyM · 15 February 2007, 17:50

Quote:

Originally Posted by bippym

okay how is this for a loader (basic)

I got this by reading various tutorials on flashtro and other sites over past few weeks etc (and I explained this to dlfrsilver last night

)

Code:

ExecBase    EQU 4
_LVODoIo    EQU -456
CMD_READ    EQU 2
IO_COMMAND    EQU 28
IO_DATA        EQU 40
IO_LENGTH    EQU 36
IO_OFFSET    EQU 44

DEST        EQU $70000
SIZE        EQU $10000
OFFSET        EQU $400

        move.l    #ExecBase,a6
        move.w    #CMD_READ,(IO_COMMAND,a1)
        move.l    #DEST, (IO_LENGTH,a1)
        move.l    #SIZE, (IO_LENGTH,a1)
        move.l    #OFFSET,(IO_OFFSET,a1)
        jsr    _LVODoIo,(a6)

(Jump to supervisor mode, not sure how yet, but I think TRAP)

        jmp    #DEST
        rts

could i use that sort of loader instead of the mfm loader from the game i've ripped files from?

I want to replace the loader with one like this (using trackdisk) would it work? and how would I know the offset on the disk for the files?

musashi5150 · 15 February 2007, 19:05

No. It would be alright for single load games - but not for multiload. The reason? The DOS functions like DoIO() etc aren't available when running an NDOS game because you are running without the OS.

The solution would be to code (or borrow) your own raw tracks loader for DOS disks....

BippyM · 15 February 2007, 20:42

hmmm this will be a challenge then seeing as I have absolutely NO idea what i'm doing when it comes to custom trackloaders!

Guess i'd better start reading and understanding.. if anyone wants to point me towards some detailed examples then please feel free!

I am at the point where I need to rebuild the disk image and track it

BippyM · 15 February 2007, 20:44

http://eab.abime.net/showthread.php?t=28058

the bootblock in that thread is so well commented it's excellent

still not too sure what i need to do tho..

Great work x_to

Joe Maroni · 15 February 2007, 20:56

Bippy....we both can reach it to understand assembler as well as we can...

if i knew earlier that i already "disassembled" the trackloader i stopped work before doing it...

but glad to see thatit help some others....
if anyone like i try to comment some other bootblocks too...

BippyM · 15 February 2007, 21:00

yeah

I'm hoping i can learn from your bootblock.

Joe Maroni · 16 February 2007, 12:51

i´m not 100% sure if everything is right commented...

musashi5150 · 16 February 2007, 14:01

You could learn a lot from here:

http://aminet.net/dev/src/trackldr1_43.lha

It's a good trackloader - maybe a little bloated, but you could slim it down some.

05 June 2008, 12:49

Why not try de-protecting Richard Aplin's Double Dragon II game with an original a500 and Amiga Replay Amiga I, II or III

Hints: CIA Timing and CyberDos

Skippstah.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Alien Storm V1.4 Uploaded to the Zone (Please Test and Provide Feedback)	Abaddon	project.WHDLoad	5	01 May 2013 08:00
So I 'cracked' Photon Storm. What do you guys think?	MethodGit	Coders. General	3	05 August 2012 02:41
How was Alien Breed '92 cracked again?	MethodGit	support.Games	7	15 October 2010 21:00
Storm C 4	vulture	request.Apps	4	26 November 2009 15:52
Storm C V4	NovaCoder	Coders. General	5	28 October 2008 10:24

15 February 2007, 19:05	#22
musashi5150 move.w #$4489,$dff07e Join Date: Sep 2005 Location: Norfolk, UK Age: 42 Posts: 2,351	No. It would be alright for single load games - but not for multiload. The reason? The DOS functions like DoIO() etc aren't available when running an NDOS game because you are running without the OS. The solution would be to code (or borrow) your own raw tracks loader for DOS disks....

15 February 2007, 20:42	#23
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	hmmm this will be a challenge then seeing as I have absolutely NO idea what i'm doing when it comes to custom trackloaders! Guess i'd better start reading and understanding.. if anyone wants to point me towards some detailed examples then please feel free! I am at the point where I need to rebuild the disk image and track it

15 February 2007, 20:44	#24
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	http://eab.abime.net/showthread.php?t=28058 the bootblock in that thread is so well commented it's excellent still not too sure what i need to do tho.. Great work x_to

15 February 2007, 20:56	#25
Joe Maroni Moderator Join Date: Feb 2003 Location: Germany Age: 44 Posts: 1,303	Bippy....we both can reach it to understand assembler as well as we can... if i knew earlier that i already "disassembled" the trackloader i stopped work before doing it... but glad to see thatit help some others.... if anyone like i try to comment some other bootblocks too...

15 February 2007, 21:00	#26
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	yeah I'm hoping i can learn from your bootblock.

16 February 2007, 12:51	#27
Joe Maroni Moderator Join Date: Feb 2003 Location: Germany Age: 44 Posts: 1,303	i´m not 100% sure if everything is right commented...

16 February 2007, 14:01	#28
musashi5150 move.w #$4489,$dff07e Join Date: Sep 2005 Location: Norfolk, UK Age: 42 Posts: 2,351	You could learn a lot from here: http://aminet.net/dev/src/trackldr1_43.lha It's a good trackloader - maybe a little bloated, but you could slim it down some.

05 June 2008, 12:49	#29
SkippyAR Posts: n/a	Why not try de-protecting Richard Aplin's Double Dragon II game with an original a500 and Amiga Replay Amiga I, II or III Hints: CIA Timing and CyberDos Skippstah.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)