Question about format

People, I am interested in the length of the data block that is requested by the controller
when executing the VG93 command record track (F0), i.e. length of the track in
bytes. In theory, a block of the same length should be issued by a read
track command (E0). Of course, this value will differ on different drives
(since it depends on the rotation speed and frequency of the generator), but you need
at least an approximate value (+/- 16 bytes). According to my calculations, this is
about 1900h (+/- 100h).

By the way, the emulator can already write to TRD discs, as well as create
new ones.

Sincerely
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Wed 20:32 10 Dec 1997 Vladimir Yudin writes to All:

VY> People are interested in the length of the data block that is requested
VY> by the controller when executing the VG93 command record track (F0), i.e.
VY> the length of the track in bytes. In theory, a block of the same length should issue a
VY> track read command (E0). Of course, this
VY> value will differ on different drives (since it depends on the rotation speed and
VY> generator frequency), but you need at least an approximate value (+/-
VY> 16 bytes). According to my calculations, this is about 1900h (+/- 100h).

Yes, somewhere around that. I did the math at the time - it turned out to be around 6200
(decimal).

Best wishes! Michael KLUG

VY> generator frequency), but you need at least an approximate value (+/- 16
VY> bytes). According to my calculations, this is about 1900h (+/- 100h).

The track recording command writes before the index pulse signal arrives!
As for the length, it is somewhere around 6.5 kilobytes (written from memory).
In the formatter I allocated 7 for it, just in case!

VY> By the way, the emulator already knows how to record on TRD discs, as well as create
VY> new ones.

And where is he?

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VY>> (F0), i.e. length of the track in bytes. In theory, a block of the same
VY>> length should be issued by the track read command (E0). Of course,
VY>> this value will differ on different drives (since
VY>> depends on the rotation speed and frequency of the generator), but you need
VY>> at least an approximate value (+/- 16 bytes). According to my
VY>> calculations, this is about 1900h (+/- 100h).

MM> Yes, somewhere around that. I thought at one time - it turned out to be around 6200 (decimal).

Now I read in the FDA doc (thanks to Slava) that on DD drives
the disk rotation speed is 5 revolutions per second, and the data transfer speed is 250 KBit. The total is: 250000/8/5=186Ah

Sincerely
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