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Andrew Dunbar
2024-11-27 23:08:25 +07:00
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td0notes.txt
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@@ -85,7 +85,7 @@
4.3 Year (1 byte) 5 4.3 Year (1 byte) 5
4.4 Month (1 byte) 5 4.4 Month (1 byte) 5
4.5 Day (1 byte) 5 4.5 Day (1 byte) 5
4.6 Hour, Minite, Second (1 byte each) 5 4.6 Hour, Minute, Second (1 byte each) 5
4.7 Comment data block (variable size) 5 4.7 Comment data block (variable size) 5
5. Track Header 6 5. Track Header 6
@@ -119,10 +119,10 @@
Teledisk is a program which reads non-PC format diskettes into image Teledisk is a program which reads non-PC format diskettes into image
files for archival and can later recreate a copy of the original disk files for archival and can later recreate a copy of the original disk
from the image file. Once popular for archival of classic computer from the image file. Once popular for archival of classic computer
software, Teledisk has been withdrawn from the market by it's software, Teledisk has been withdrawn from the market by its
manufacturer and is no longer legally available. This presents a manufacturer and is no longer legally available. This presents a
problem for those people who have data archived with Teledisk, problem for those people who have data archived with Teledisk,
because the file format is proprietary and not documented rendering because the file format is proprietary and not documented, rendering
the data useless without the program. the data useless without the program.
In my development of ImageDisk (a replacement for Teledisk), I have In my development of ImageDisk (a replacement for Teledisk), I have
@@ -297,7 +297,7 @@
4. Comment Header / Data block 4. Comment Header / Data block
The comment block encodes an ASCII comment as well as the creation The comment block encodes an ASCII comment as well as the creation
date. It's presence is indicated by the high bit of the "Stepping" date. Its presence is indicated by the high bit of the "Stepping"
field in the image header being set. field in the image header being set.
When present, it occurs immediately after the Image header in the When present, it occurs immediately after the Image header in the
@@ -309,7 +309,7 @@
Month (1 byte) Month (1 byte)
Day (1 byte) Day (1 byte)
Hour (1 byte) Hour (1 byte)
Minite (1 byte) Minute (1 byte)
Second (1 byte) Second (1 byte)
Following the comment header are comment line records, consisting of Following the comment header are comment line records, consisting of
@@ -347,7 +347,7 @@
Gives the day (of the month) the image was created using a range Gives the day (of the month) the image was created using a range
of 1-31. of 1-31.
4.6 Hour, Minite, Second (1 byte each) 4.6 Hour, Minute, Second (1 byte each)
Gives the time of day the image was created using 24-hour time. Gives the time of day the image was created using 24-hour time.
@@ -389,7 +389,7 @@
5.3 Side/Head number (1 byte) 5.3 Side/Head number (1 byte)
This field encodes the disk side (0 or 1) that this track occurs This field encodes the disk side (0 or 1) that this track occurs
on in it's lower bit. on in its lower bit.
The high bit of this field is used to indicate the track was The high bit of this field is used to indicate the track was
recorded in single-density. This allows mixed-density disks to be recorded in single-density. This allows mixed-density disks to be
@@ -459,7 +459,7 @@
or 1, and are not necessarily an unbroken series of numbers. Some or 1, and are not necessarily an unbroken series of numbers. Some
formats encode seemingly arbitrary sector numbers. formats encode seemingly arbitrary sector numbers.
Teledisk sometimes creates bogus sectors headers to describe data Teledisk sometimes creates bogus sector headers to describe data
that is not in a properly formatted sector. These extra sectors that is not in a properly formatted sector. These extra sectors
appear to be created with sector numbers begining at 100. appear to be created with sector numbers begining at 100.
Teledisk .TD0 notes Page: 8 Teledisk .TD0 notes Page: 8
@@ -483,7 +483,7 @@
6.5 Flags 6.5 Flags
This is a bit field indicating characteristics that Teledisk noted This is a bit field indicating characteristics that Teledisk noted
about the sector when it was recorded. The field contain the about the sector when it was recorded. The field contains the
logical OR of the following byte values: logical OR of the following byte values:
01 = Sector was duplicated within a track 01 = Sector was duplicated within a track