4 ms·

$2000-$3fff &D (2014)

46 points by luu 2y ago

bcoates 2y ago
Looks cool... anybody want to do an explain-like-im-not-a-c64-esoterica-expert on what this is?
- dan-robertson 2y ago
  I also don’t know. Reading the comments in the OP, it seems it’s some kind of defence game where successful attacks (ie those you fail to defend against) modify the game code, causing surprising behaviour.
  - Luc 2y ago
    Yup, Missile Command, but the game code is located in bottom of the bitmap ('frame buffer' if you like), so when the line drawing code writes to that area it will modify it. Shenanigans! The bitmap would end before $3fff though, since it's only 8000 pixels.
- duskwuff 2y ago
  Missile Command, except instead of cities at the bottom of the screen, it's the data and code of the game (which is resident in video RAM). Fail to intercept a missile? Game gets corrupted.
cancerhacker 2y ago
A friend of mine mid 90s was doing a clean room rewrite of doom (for fun, just to learn) and didn’t have any bounds checking on his maze - so it was possible to wander off into program memory and shoot variables. (Classic Mac OS, no memory protection)
- BobbyTables2 2y ago
  Shooting variables sounds very satisfying!
zenethian 2y ago
I really wish that the text for this was transcribed so where so I didn't have to ake a screenshot of a gif at just the right moment to read it.
- duskwuff 2y ago
  The visible text in the GIF is: $2000-$3fff was made for the Ludum Dare #31 Game Jam in December 2014. It is actually more than just a game. Some of you will say it's crap, but we would point out that it's both a game and a piece of art. The idea and concept is actually great: This is the official description of the game: "$2000-$3fff is a Commodore 64 program which displays its entire memory on the screen, then draws missiles into it. Use a joystick in port 1 to target your dangerous explosive weapon. If you don't have a C64 handy, feel free to use an emulator like VICE. Defend program data and program code 01/02
  - Pikamander2 2y ago
    Normal spaced version: $2000-$3fff was made for the Ludum Dare #31 Game Jam in December 2014. It is actually more than just a game. Some of you will say it's crap, but we would point out that it's both a game and a piece of art. The idea and concept is actually great. $2000-$3fff is a Commodore 64 program which displays its entire memory on the screen, then draws missiles into it. Use a joystick in port 1 to target your dangerous explosive weapon. If you don't have a C64 handy, feel free to use an emulator like VICE. Defend program data and program code.
panic 2y ago
This was my entry to the Ludum Dare 31 game jam—the theme was “entire game on one screen”. The original page can be found here (maybe I should link to this rather than the cracked version on my site…): https://web.archive.org/web/20150106204654/http://ludumdare.com/compo/ludum-dare-31/?action=preview&uid=1496 https://web.archive.org/web/20150106204654/http://ludumdare....
deleted 2y ago
[deleted]

46 points by luu 2y ago

bcoates 2y ago

Looks cool... anybody want to do an explain-like-im-not-a-c64-esoterica-expert on what this is?

dan-robertson 2y ago
I also don’t know. Reading the comments in the OP, it seems it’s some kind of defence game where successful attacks (ie those you fail to defend against) modify the game code, causing surprising behaviour.
- Luc 2y ago
  Yup, Missile Command, but the game code is located in bottom of the bitmap ('frame buffer' if you like), so when the line drawing code writes to that area it will modify it. Shenanigans! The bitmap would end before $3fff though, since it's only 8000 pixels.
duskwuff 2y ago
Missile Command, except instead of cities at the bottom of the screen, it's the data and code of the game (which is resident in video RAM). Fail to intercept a missile? Game gets corrupted.

cancerhacker 2y ago

A friend of mine mid 90s was doing a clean room rewrite of doom (for fun, just to learn) and didn’t have any bounds checking on his maze - so it was possible to wander off into program memory and shoot variables. (Classic Mac OS, no memory protection)

BobbyTables2 2y ago
Shooting variables sounds very satisfying!

zenethian 2y ago

I really wish that the text for this was transcribed so where so I didn't have to ake a screenshot of a gif at just the right moment to read it.

duskwuff 2y ago
The visible text in the GIF is: $2000-$3fff was made for the Ludum Dare #31 Game Jam in December 2014. It is actually more than just a game. Some of you will say it's crap, but we would point out that it's both a game and a piece of art. The idea and concept is actually great: This is the official description of the game: "$2000-$3fff is a Commodore 64 program which displays its entire memory on the screen, then draws missiles into it. Use a joystick in port 1 to target your dangerous explosive weapon. If you don't have a C64 handy, feel free to use an emulator like VICE. Defend program data and program code 01/02
- Pikamander2 2y ago
  Normal spaced version: $2000-$3fff was made for the Ludum Dare #31 Game Jam in December 2014. It is actually more than just a game. Some of you will say it's crap, but we would point out that it's both a game and a piece of art. The idea and concept is actually great. $2000-$3fff is a Commodore 64 program which displays its entire memory on the screen, then draws missiles into it. Use a joystick in port 1 to target your dangerous explosive weapon. If you don't have a C64 handy, feel free to use an emulator like VICE. Defend program data and program code.

panic 2y ago

This was my entry to the Ludum Dare 31 game jam—the theme was “entire game on one screen”. The original page can be found here (maybe I should link to this rather than the cracked version on my site…): https://web.archive.org/web/20150106204654/http://ludumdare.com/compo/ludum-dare-31/?action=preview&uid=1496 https://web.archive.org/web/20150106204654/http://ludumdare....

deleted 2y ago

[deleted]