.sp
F0: requires set wheel byte (Backgrounder II)
.br
-F1: public file (P2DOS, ZSDOS), forground-only command (Backgrounder II)
+F1: public file (P2DOS, ZSDOS), foreground-only command (Backgrounder II)
.br
F2: date stamp (ZSDOS), background-only commands (Backgrounder II)
.br
Al is interpreted as 16 byte-values, otherwise as 8 double-byte-values.
A block pointer of 0 marks a hole in the file. If a hole
covers the range of a full extent, the extent will not be allocated. In particular,
-the first extent of a file does not neccessarily have extent number 0.
+the first extent of a file does not necessarily have extent number 0.
A file may not share blocks with other files, as its blocks would be freed
if the other files is erased without a following disk system reset. CP/M returns
EOF when it reaches a hole, whereas UNIX returns zero-value bytes, which makes