Introduce TR-DOS disk format support#859
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Define disk formats for ZX-Spectrum BetaDisk interface. Used to be a de-facto standard on Ex-USSR territory, there's a huge amount of software available, both original western titles (pirated of course) and homebrew. Tested on Greaseweazle hardware by reading a disk, which was written using native 'gw' utility from a EDSK image, converted from SCL using SAMTools. Writing appears to work, gap lengths taken from TR-DOS disassembly. Verification on real hardware is TBD. Signed-off-by: Pavel Fedin <pavel_fedin@mail.ru>
.trd is a simple image, the same as IMG, but this suffix is standard for plain TR-DOS disk images. Signed-off-by: Pavel Fedin <pavel_fedin@mail.ru>
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TR-DOS is a built-in ROM-based operating system for BetaDisk interface for the ZX-Spectrum by Technology Research Ltd. In late 80s it was brought into (back-then) USSR and cloned, having become a de-facto standard floppy disk interface for ZX-spectrum clones.
Official documentation says both 40- and 80- single- and double- sided drives are supported, however in practice i never met any other formats than 80-track DS. The controller is off-the-shelf 1793 chip, so encoding scheme it a standard IBM-compatible MFM. Sector size is 256 bytes, 16 sectors per track.
Official extension for plain TR-DOS disk images is .trd, so i added it to the list of recognized extensions by IMG writer.
At the moment is only tested with my Greaseweazel hardware. I do have a real Spectrum clone (that's how my involvement in Fluxengine has started), but at the moment is has problems and fails to read disks even when formatted by itself. I'll re-test things, of course, after fixing.