msx-pyramidwarpex

Disassembly, reverse engineering, and possible enhancement of the MSX game cartridge "Pyramid Warp (1983)"

Versions:

PyramidWarp.annotated.asm:
- The annotated disassembly of Pyramid Warp (1983).
- Assembles to the original ROM, verbatim.
PyramidWarp.enhanced.asm:
- The original source code, once disassembled, was easy to understand and easy to improve because it used no compression, did no clever tricks, and underused some resources (e.g.: the game looked like SCREEN 1 despite being SCREEN2 already).
- This is a patcheable version of the original source code that allows several of those enhancements.
- This version keeps most of the original source code untouched and, actually, a pixel-perfect clone of the original game can be assembled from this!
PyramidWarp.enhanced+.asm:
- This version break ties with the original source code wherever necessary to accomodate not-so-easy-to-fit enhancements (such as a proper music replayer or a sprite flickering routine)

Moved RAM start from $C000 to $E000 (RAM requirement is now 8KB)
Unused data removed. Data realigned to simplify routines and to free space (+512 bytes freed)
Disabled keyboard click sound
Player starts looking down instead of up (simply because it looks better)
Numbers in scoreboard aligned right to improve readability
Patcheable colors (symbolic constants in assembly code)
Patcheable graphics (external binaries for font, charset and sprites)
Patcheable room definitions (external assembly code)
5th and 6th enemy slots can be enabled

Sprite flickering routine
Proper title charset
Proper music and sounds! (by Bitcaffe)
More randomness! Rooms can be mirrored and flipped
More room definitions! (room editor by Nenefranz)
Difficulty option! Choose between: easier (3 enemies), original (4 enemies), enhanced (progressive and adaptative number of enemies), and harder (6 enemies).

Enhanced versions by Bitcaffe (music), Nenefranz (code & graphics), and theNestruo (code)