tandy put their sound chip on the 1A interrupt? THE TIME SERVICES?
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I started reverse engineering Where in the World is Carmen Sandiego (Enhanced DOS edition) and I'm trying to find how it generates its random seeds so I search on int 1a and the first thing I find is it's doing TANDY SOUNDS?
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Funny fact: I was trying to get an online assembler to spit out the machine code for "int 1a" but couldn't get it to, so I just went "fuck it, I can probably just do that in my head!"
Turns out I can. My brain is weird.
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Here's something I didn't know existed until just now: Where in the World is Carmen Sandiego checks your name against the list dossier list and rejects you if you use any of those names.
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PRONOUNS DETECTED: THIS GAME IS WOKE
sadly they don't have they/them on here. What about the non-binary criminals, huh?
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stretch goal: hack in at least on enby criminal with appropriate pronouns. maybe I'll just put myself in the game as one of the criminals you can apprehend
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I faked this screenshot but this is what I mean
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I think I might be able to do the hack I want by changing one byte.
I'm trying to change it so it has "daily challenges", and I think I can fix that by just switching a INT 1A from subfunction 00 to 04, making it seed the random function with the date instead of the ticks-since-midnight
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eh, I used 5 bytes. I don't need to impress anyone
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NORMAL CODE
random(*(byte )(undefined2 *)
(*(int *)(*(int *)0x39a6 * 0xe + local_c * 2 + 0x1d02) * 2 +
*(int *)(local_c * 2 + 0x24b)) - 1);
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I found another set of pronouns!
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I haven't figured out how this game stores gender, but I'm gonna go out on a limb and say it's like this:
male: 0
female: 4
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why? because they have strings like:
char* HE="He\0\0She\0"
char* HIS="His\0Hers\0";
char* HIM="Him\0Her\0";
so they can do like:
printf("Follow %s to %s lair, and capture %s alive!", badguy->name, HIS+badguy->gender, HIM+badguy->gender);
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I like how the game only asks your name, not your gender.
Player's don't have genders. Only thieves have genders.
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It's a prequel to Disco Elysium, and your gender is set to COP
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why does ghidra's "search by instruction pattern" default to BINARY?
what kind of a freak remembers the machine code for INT 21 on x86 in BINARY?
it's CD21h, not 1100110100100001!
what are you, some kind of nerd?
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I love reversing a string and it's:
void printString(char* str, int length);
and I go look what calls it, reverse that function, and it's:
void printStringSimple(char *str){
printString(str, strlen(str));
}
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it's like "aww, did someone have second thoughts about making PRINT always take a length, and got tired of having to manually calculate lengths so you just wrapped it?
and your compiler didn't inline SHIT?
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oh those poor people of Bamako! Someone stole their.
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okay so when you start a game (well, technically when you restart), the game rolls 3 dice:
0-31: where the shit was stolen from
0-2: which item it is from that location
0-8: whodunnit
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like if you roll 0 on the first, you get Athens.
For the second one, it's:
0: mask of Priam
1: Achilles's heel
2: sibyl's secret.
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The last die is used as a lookup table into the dossier's list.
It's got 1 added to it so you won't get Carmen Sandiego, as a rookie at least.
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so the game uses a pattern like this:
char * RANKS="Rookie\0Sleuth\0Private Eye\0Investigator\0Ace Detective\0"
and then latter they do:
char* your_rank = select_string(RANKS, player->rank);
and select_string is a confusing function to reverse engineer, but knowing the name I gave it gives it away: it advances through the list until it's on the nth string and returns it
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there is no check for going past the end.
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so probably it uses the same trick for pronouns. The string I'm seeing is probably like: "He\0Him\0She\0Her\0"
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Ghidra is officially sexist. It'll automatically detect the word "Female" and mark it as a string, but not the word "Male"!
Why? SEXISM!
or the fact the default minimum length for strings is 5 characters, so "female" is long enough but "male" isn't.
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@foone but... if you put yourself in as a criminal, you will no longer be allowed to play!
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@shtrom that's the price you pay for representation
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@foone you're french and you're a member of the Gendermarie
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@jollysea I am definitely a member of the gender army
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@foone when i was younger and a lot more naive i used to think old games were all hyper-optimized, artfully crafted code wrote by ancient wizards who would eek out the most of every clock cycle
.... yeah.
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@foone If someone stole their, that may be why there's no they/them in the game
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@foone stealing their can only be the diabolical work of one Carmen Sandiego
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@foone@digipres.club You just made the funniest typo this year (so far at least). It doesn't detract in any way from the quality of your posting, but my brain is amused to think of the logical conclusion to a world where that wasn't a typo:
Because of a missing 0, makes it sound like the game has the pronouns: "he", "him/she", "her". meaning either you're bigender, or you have an incomplete set of pronouns
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@foone gonna make a "Foone posts that sound deep and menacingly existential" account and become more known than Jesus in two weeks
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@foone You may therefore reach secret ranks, like Modern Major General, or ŸŸŸŸŸŸŸŸ.
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@foone
Old school. Never check for an error condition if you don't know what to do about it.
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@foone finally the O(2N) string printing function
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@foone clearly we need the compromise of octal. 315 061
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@ChartreuseK not even supported by this ghidra dialog. Binary or hex are the only options.
And note the weird part where it's "search by instruction pattern" but typing in instructions isn't possible.
You need the machine code for int 21h, not just "int 21h"
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@foone ACAB. Assigned Cop At Birth. (Which is how I always read that acronym before remembering what it should read...)
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@foone Having a gender is NPC behavior
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@foone those thieves are pretty good if they stole all the genders!
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@Larymir When no one was looking, Foone took forty genders. She took 40 genders.
And that's terrible.
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@foone Unlike Leather Goddesses of Phobos, where that’s the first thing the game asks.
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@foone so it also supports e/im/is, he/er/er, e/r/r and no pronouns as genders 1, 5 and 3/6?
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@lydiafacts technically yes! as well as large number of neopronouns used by indexing into other strings, possibly? it might be only one byte, which limits how far you can address
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@foone does this game not use structs??
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@mossfet it might! this is just theorizing based on memory layout
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@foone ahhh
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@foone Even if you only care about a binary, this still seems bad because you need quite a few pairs. With this setup, this print could very easily produce "Follow NAME to hers lair, and capture her alive!"
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@foone There was a time when I would have thought that extremely clever. These days, I look at that and shake my head at how English-centric it is.
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@foone ah, the same way that Intel stores privilege levels.
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@foone fae suspect who's stolen all the other genders from the National Pronoun Repository
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@DotMaetrix You mean the Strategic National Pronoun Reserve?
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@foone
Gotta catch 'em all!
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@foone It’s been so long since I did any C programming, I can’t even tell the name of the variable being declared there.
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@foone This is why I hate C.
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@foone
Wanted: Foone
Several counts of crimes against keyboards
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text/gemini
