Since you split it out, I'll repeat "What is the largest assembler program you ever wrote", for me the answer is a module of about 2000 lines (excluding comments) for the PC, the fact that when we put it all together (~200 modules, ~100 mine) we got to a total for the project of ~120.000 lines is irrelevant. This worked in conjunction with a lot of "C" code used where timing was non-critical. With the efficiency of todays "C" and the access to more than 620k memory the assembler code would probably reduce to about 25.000 lines.

Yes, both "C" and assembler have their use, but if you do not code modular, it does not matter what language you are using, you will do badly in either case.

Have lots of modules of fun