Thanks for publishing the source code and all the work that you put into this! Wow!

I have a question about this line in main.asm:

	;.ds 6,0			;padding, so drum sounds are w/in page limits

In what part of the code is the 256-byte page boundary applied to? The drumTable is not padded to align to a page boundary. The plist music data is not aligned to a page.

I am porting this to the SHARP PC-1350. I rewrote the asm files to generate binaries with the AS61860 assembler
https://shop-pdp.net/ashtml/asmlnk.htm which is a bit more powerful so it's easier to retarget the code for other SHARP pocket computers, but PC-1350 and PC-1403(H) for now.

I'd like to add a .bndry check to the code to enforce this page alignment which helps to avoid trouble when retargeting.