I've noticed a few bugs(?) in my hack that I need help fixing.
-The amount of Potions/Antidotes in your inventory is not shown
Hard to say what's causing this without knowing what you've changed.
-The Fiend battle music does not play (instead mini boss theme does)
There is only 1 battle theme in all of FF1. From IMPs, to minibosses, to fiends, to the final boss himself -- every battle uses the exact same song.
-Default equipment does not appear even though I changed those values in a hex editor
?? There is no default equipment??
Also, though this isn't a bug, can someone tell me if it is possible to increase the amount of weapons/armor within FFHackster?
The number of "items" is currently limited to ~256 since the game only uses 1 byte to represent them. Of those items, different ranges are designated for "weapons" and "armor".
It is theoretically possible to take items away from something else (like the "100 G" things you find in treasure chests) to create new weapons or armor... but this would require a lot of changes in the game to move all of the ranges over. Plus, you'd have to find more space for weapon/armor stats and all that nonsense.
So... technically possible, yes. But it'd be tons of work. And of course, Hackster wouldn't know about it and you probably wouldn't be able to edit your new weapons in hackster.