HEADER (fast, no I) on d64 image does not work correctly

[lydon42]

Core: latest dev
ROM: 920407

When using HEADER"TEST" on a mounted D64 image, the title of the directory is empty after executing the command. This does not happen with mounted D81 images.

Reproduce:

• make D64 image (I used c1541 -format "test,t1" d64 test64.d64) and copy to SD
• MOUNT the image
• check DIR for title TEST
• HEADER"TEST"
• check DIR again, title is empty

If you remount the image after that, the first 16 files will also show up again. For that I saved 200 files to the D64 image (suing MEGA65), then issued the fast HEADER (no I), then DIR (all shows empty), then MOUNT the image again. After that a DIR will show the first 16 files again (but the title stays empty).

[johnwayner]

It looks like the original D64 support work explicitly errors out on full formats of D64 images. The fast format (no I option) bypasses that D64 check and falls into partformat which was never modified for D64 support. It modifies the disk as if it was a 1581 format, so it's surprising the disk works at all after that.

I'm not very familiar with disk formats, so I can't easily add D64 support for fast formats. I can, however, cause an error for fast format requests on D64 images as well -- which seems to have been the original implementation's intent.

[dansanderson]

I'm fine with an error for the unsupported case. Adding seamless fast formatting support for a D64 can be a follow-up feature request.