🚀 go-pugleaf

I just noticed that "Inside Atari DOS" apparently has an error in describing
the sequence of the control bytes at the end of DOS sectors.  I would
appreciate confirmation by anyone who knows.

Inside Atari DOS (IAD) says that a sector consists of 128 bytes, numbered 0
through 127, and that in DOS files only 125 bytes (0 - 124) are used for data.
(This much is true.)  They go on to say that byte numbers 125, 126, and 127
are numbered as follows:

		125                     126                     127
IAD    | # of bytes actually    6 hi bits=file number     low 8 bits of next-
Version| used in the sector     2 lo bits=hi bits of      sector number (link)
				next-sector number

Documentation supplied with David Young's OMNIMONXL resident monitor/debugger
says that the numbering is

		125                     126                     127
The   | 6 hi bits=file number   low 8 bits of next-     number of bytes
Truth!| 2 lo bits=hi bits of    sector nr (link)        actually used in this
      | next sector nr (link)                           sector.


Based on what I can see in the actual sectors I have looked at, both with
OMNIMONXL and with another independently developed debugger, David Young's
information appears to be correct and Inside Atari DOS appears to have
incorrect information.

I would appreciate confirmation of my conclusion by others who have noticed
the error in IAD.  (Also if they have any other errors I would like to be
made aware of them!)

						John Sangster
						jhs at mitre-bedford.arpa
				   <anypath to ihnp4>!ihnp4!linus!mbunix!jhs