Help~ about protected BASICA program. \ VOGONS

Help~ about protected BASICA program.

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First post, by coolhaken

Posted on 2016-08-18, 14:20

coolhaken Offline

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Posts: 90
Joined: 2010-05-15, 02:16

Hi all,

I dumped an old BASICA game from a floppy with heavily mold.
After several times of try, there were still 4 bytes corrupt (2EE7~2EEA).
I dumped 5 times and compared every copy, then upload the best one.
Also, this BASICA program is in protected format.
Anyone can help me to recover this program or give me some suggestion ?
Thanks a lot !

Reply 1 of 3, by Jorpho

Posted on 2016-08-18, 15:32

Jorpho Offline

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Since it's only four bytes, my first inclination would be to find some means of somehow iterating through all combinations until the correct values are found.

But searching for <basica protected> suggests there are other means of unprotecting a BASICA program.
http://www.chebucto.ns.ca/~af380/GW-BASIC-tokens.html#pgwbp

Something called UNPBAS11 also comes up.

Reply 2 of 3, by ZanQuance

Posted on 2016-08-18, 17:13

ZanQuance Offline

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Rank: Member
Posts: 409
Joined: 2015-01-01, 23:47

Let me fix that for you:

Here you go
[edit]Changed it to ascii mode instead of unprotected program binary mode

Reply 3 of 3, by coolhaken

Posted on 2016-08-19, 12:44

coolhaken Offline

Rank Newbie

Rank: Newbie
Posts: 90
Joined: 2010-05-15, 02:16

Thank you ! Jorpho and ZanQuance.
Now I can decode this program by myself.
I'll try to look into it later.

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