stardot.org.uk

Hi Rich, if I recall the Lunar Jetman protection file is 256 bytes longer is because it is encoding the interrupt which handles the multi mode screen pic during loading.

yes, that's right, will send to Colin. thanks

Hi I have Pentiles by Silverlind I'm willing to loan to someone for preservation.

hello Daniel

not yet...hopefully soon. also bought those first edition Chalksofts.

I bought the game to preserve it. Hope that clarifies things!

it was me.

yeah it was only meant as something simple but defeated Howard Spurr's copier.

I once wrote and had published a disk protection that relied on track 81 being readable! you can't even run this in an emulator, lol.

Hi Kevin It's sortof true, the Nightshade first decryptor does not have the cascade (either ADC &E01,X or EOR &E01,X where page &E is the loader) so because the game loads off tape without encryption it does allow for a possible hack here, by editing the mode change LOADING thing and sav...

I'm quite happy at writing a Master only Kevin-type protection system if it's of help for emulation!

wow, Rich T-W is going to kill me for this, I just broke into the Galaforce protection with 42 bytes of software, no James Fidell emulation or breakpoints needed. I can't understand why I didn't see this before. The key is, the EOR &700,X instruction, and the fact that there's no attempt in the ...

I didn't know where else to put this. leenew wrote in another thread: (about this idea I have) Leenew:Would your theory have been possible back in the 80s? Yes. Lee:Also, do you reckon it would have been possible without the knowledge that we now know about nightshade? Sortof. It doesn't require any...

new thread, ok.

Slightly off topic, I have a theory about cracking Nightshade on tape in software, but I haven't tried it yet.

oh, now I feel really small.

I'm sorry for sounding a bit dim, can you explain how I create a blank writable SSD disk in BeebEm? (or otherwise) - cheers.

my code is ready for testing.

Thanks for the replies, the way I'm setting this up I will need to disable interrupts.

Thanks for the reply, I'm trying to write a software hack for the unspeakably hard Tapper decrypter (without emulating it!), and yes it has to be either sideways RAM or a ROM MOS modification.

hello, dang, I haven't posted in years! I'd like to know if it's possible to code (from the BASIC assembler) directly into sideways RAM, point the primary interrupt at your code and expect a BBC emulator to be able to run it. I realize that's a silly thing to ask, but it matters for a reason I'll re...

lion, I'm sure people have told you before, but Zalaga doesn't run on a Master, most likely because it uses non-standard 6502 instructions to do things with the sprites. I think the Master uses up some of these values for its own slightly different processor?

I happen to have Cosmic Battlezones I've no idea where the instructions are though.

I worked out that Kevin's back door is the *fx 200,3 command when the setup is run so that he could exit the routine and save the encrypted thing to tape. You can't access the encoded data using this though...

Anyway I can't really think of a better way to do it than by hand, loop by loop. What did you have in mind? If I recall (and it is over 20 years ago) it had something to do with loading the encryption and running it directly in a different screen mode. It then bombed out after decoding the little l...

yes, you've missed something, from what I remember. I don't know whether I should tell you or not...

There's a quicker way of doing that, Mr Talbot-Watkins.

I wasn't able to go to R3PLAY, how do I get hold of one?

I have a lot of rare BBC software, many titles not on this website (STH or Acorn preservation) e.g Chicane by Kempston and the Hit Squad versions of Yie Ar Kung Fu and Hypersports. I have a number of educational disks too, but I haven't the means of preserving these :roll: The rarest Spectrum progra...

...and if you look on ebay, someone is selling 100 sealed copies of Hareraiser...

can't go, sorry -not well
from Guy