29 Apr
2011
29 Apr
'11
4:56 p.m.
On Fri, 29 Apr 2011, Philip Pemberton wrote:
That's a partial image of a TRS-80/4 floppy. The
logarithmic histogram
. . .
The three peaks on the histogram suggest MFM coding, with a base time
period of around a microsecond. This gives a data rate of ~250kbps.
. . .
Moving onto the scatter plot, you can see what appears to be nine
distinct sectors. The first three are apparently blank (0xFF), with data
in the remaining six.
Are you SURE that that disk is from a TRS80?
TRS-DOS and its derivatives normally had 256 bytes per sector (18 sectors
per track)