tandy put their sound chip on the 1A interrupt?

[foone@digipres.club]

okay I figured out the cities.dat IDs:

They're all 1XXYY (in decimal):
XX is the city number (0-29), YY is the sub-chunk-id.

So like:
YY=0: City name
YY=2: City image.

They go between 00 and 22, and not all numbers need to be present.

[foone@digipres.club]

hmm, reading a buffer and then summing all the values of the bytes in it.

suspicious behavior.

[foone@digipres.club]

okay I think it has a very simple 1-byte CRC check on the chunks, which are optionally not run.
I can't make the math work but I'm reasonably sure that's what it is

[kawa@mas.to]

@foone Not with that attitude. If a GBA can do threading and DOS can run JavaScript, surely you can do threading in DOS.

[foone@digipres.club]

@kawa YEAH BUT YOU SHOULDN'T

[kawa@mas.to]

@foone SEE? ATTITUDE PROBLEM!

[foone@digipres.club]

@kawa I'LL PROBLEM YOUR ATTITUDE

[foone@digipres.club]

okay they're using a blit that's UI-aware, so it starts the coordinate system at (1,13). Fun!

[foone@digipres.club]

looking into the blitting code I managed to steal the world map out of RAM

[foone@digipres.club]

ugh. TODO for my eventual Good DOS Debugger:
Instant Video display.
I don't know exactly how DOSBox-X is doing it, but while single-stepping the debugger, the display never updates. I can dump the ram at A000:0000 and see what updated, but not on the screen in DOSBox

[th@social.v.st]

@foone someone alert CIAA (the Cartographers Industry Association of America)

[riley@toot.cat]

@foone Perhaps it only updates an internal SDL canvas, but never throws it on the actual screen.

[foone@digipres.club]

found a suspicious array, which goes:
[
(-1,0),
(-1,1),
(0,1),
(1,1),
(1,0),
(1,-1),
(0, -1),
(-1,-1),
(0,0)
]

POP QUIZ: why does the font renderer need this array? how are they being "lazy" with this array?

[foone@digipres.club]

there's also this code in the for-loop that steps through this array:

if index==8:
color=white
else:
color=black

[foone@digipres.club]

@riley could be. I may have to see if I can hack it so that stepping the debugger tails the main window to update somehow

[foone@digipres.club]

@th nice

[rappet@chaos.social]

@foone to draw the black shadow around the map?

[dividuum@chaos.social]

@foone „outlining by overdrawing“. I may or may not have used this technique in the past

[foone@digipres.club]

@rappet Nope. Remember, it's in the font renderer

[foone@digipres.club]

@dividuum bingo!