- also check that load "<filename>",8,1 would work

Regarding 2nd byte in the last block of dir, shouldn't that always be $ff?

Quoting tlr

- also check that load "<filename>",8,1 would work

Please elaborate. Do you mean a special check option to make sure that a given filename can be loaded?

I ment that it should check if loading the filename listed in the directory will actually work, e.g by adding load and ,8,1 to what is listed when doing load "$",8 (or $, DOS"$, etc...)

I think it would be good if it performs checks that load also works for popular traditional carts like FC3, AR6 and such in case there are filename limitations there.

Maybe a load address check too to flag things like needing ,8,1 for a file that is supposed to be basic runnable, e.g load address is $0800.

Quoting tlr

Maybe a load address check too to flag things like needing ,8,1 for a file that is supposed to be basic runnable, e.g load address is $0800.

Can you detail those checks? It all seems awfully close to trying to solve the halting problem, imho. =)

The interesting thing here is that there seems to be a bug in 1541's DOS 2.6, such that blocks aren't all-zeroes after format. The first byte may be anything. Apparently some off-by-one thing.

IIRC a DOS 2.6 formatted disk always gives an initial $4b, followed by all $01's.

Quoting tlr

IIRC a DOS 2.6 formatted disk always gives an initial $4b, followed by all $01's.

Yes about the $01s, but at least in VICE, the first byte can also be $00 or $08 (seen on track 1 after format).