Patching MechCommander's Infamous Left Arm Bug for Fun and Profit
Patching MechCommander's "left arm bug" for fun and profit
I spent a day reverse-engineering MechCommander 1 using Ghidra to fix a quirky bug where all large weapons are forced into the left arm. By analyzing the game's machine code and debugging symbols, I discovered why the original developers misclassified weapons from the Desperate Measures expansion. This fix ensures that losing a single arm no longer instantly destroys a mech loaded with heavy firepower.
So the first and most obvious takeaway is that LRMs come in racks but SRMs come in packs, which is vital information for defeating the Clan invaders.
- 20k
Oh man this was my biggest pet peeve with mechcommander as a kid, thanks for fixing it!
- toast0
I wonder if the board game materials have rules or guidance about where equipment goes? I dunno how close the computer games stick to the board game materials though.
- derac
This is cool, maybe "target left arm" implies that it's your left, when targetting them and you're facing each other. So, their right arm.
- pkhuong
If you need a compact byte -> bit lookup table on x86, consider using the memory form of the bit test (BT) instruction.
- close04
It just hit me, in 2026, that MeshCommander [1] (the Intel AMT remote management tool) is probably a homage naming after MechCommander.
Came here excited that MeshCommander is maintained again.