On Thu, 25 Feb 2010, Mike Loewen wrote:
Some recommemded books:
"Machine Language Disk I/O & Other Mysteries", by Michael J. Wagner.
"TRS-80 Model III Assembly Language", by Hubert S. Howe, Jr
"More TRS-80 Assembly Language Programming", by Bill Barden
"The Custom TRS-80 & Other Mysteries" by Dennis Bathory-Kitsz
TRS80 Disk and other mysteries, by Harv Pennington (first one in series,
and describes the model 1 disk format (directory entries are lists of
block numbers and length, plus TWO passwords per entry, a hash table for
improving lookup speed, block map, and strange choices of data address
marks, etc.)
Barden also did a short (pamphlet?) on disk I/O and working with the FDC
and he put out several pocket reference cards
The Radio Shack "Service"? manuals were fairly good.