This can be used to split up a file being too large or having too many lines to be loaded in one go.

The code crashes if I flll the TPA with zeros all the way up to the start of BDOS minus 6 as pointed to by the jump vector at memory location 5/6/7.

Pulling back 128 bytes at the end makes it work again. 80 bytes seems not to be enough.

Abort loading when running out of memory or line-pointers.

When scrolling down to lines with tabs the old contents is visible in the "jumps" caused by the tabbing

The current codebase uses among others LD (HL),BC that are silently converted by ZASM into 4 separate instructions.

Most old assemblers doesn't do that and just reports an error.