Add support for MSX disk formats

[sdsnatcher73]

For MSX disk images I currently use atarist.360 and atarist.720. While this works MSX does support more formats (40 track based) and also I would suspect MSX format is more like IBM's (given Microsoft's involvement). I would propose the following to diskdefs.cfg. I am not sure about iam, cskew and hskew used in atarist formats.

`disk msx.1d cyls = 40 heads = 1 tracks * ibm.mfm secs = 9 bps = 512 gap3 = 84 rate = 250 end end

disk msx.1dd cyls = 80 heads = 1 tracks * ibm.mfm secs = 9 bps = 512 gap3 = 84 rate = 250 end end

disk msx.2d cyls = 40 heads = 2 tracks * ibm.mfm secs = 9 bps = 512 gap3 = 84 rate = 250 end end

disk msx.2dd cyls = 80 heads = 2 tracks * ibm.mfm secs = 9 bps = 512 gap3 = 84 rate = 250 end end`

I will create some flux dumps of freshly formatted disks (I will gw erase them prior to formatting on real hardware). I am not sure I have a machine that supports the 40 track format but will check.

[sdsnatcher73]

msx1dd.zip msx2dd.zip

[sdsnatcher73]

Found a National FS-5500 which supports the 40 track option during formatting (all MSX's can read such disks afterwards). When issueing the call fornat command the following is printed on screen:

[code]Drive name? (A,B) 1 - 1 side 2 - 2 sides 3 - 1 side, double track 4 - 2 sides, double track[/code]

The following two flux dumps are from option 1 (msx1d.scp) and 2 (msx2d.scp). The 3.5" HD drive seems to double step automatically upon reading (so I dumped cylinders 0 to 41 for both). Or do you think the drives are not double stepping (and only cylinders 0-39 are used)? That would seem a bit odd though...

msx1d.zip msx2dd.zip

[keirf]

There's no interleave or skew. So your config lines are correct.

[sdsnatcher73]

Thx!