The Programmer's Guide to TRSDOS Version 6 - Tim Mann's Home ...

7.6.22 @DIRWR SVC-88
This SVC will write the system buffer, SBUFF$, back to the disk directory sector that
contains the directory entry of the DEC specified in the calling linkage. See the
sections on HASH INDEX TABLE and DIRECTORY RECORD FORMAT for additional information.
Registers Affected: AF, HL.
Entry:
B Directory Entry Code of the file.
C Logical drive number (0-7).
Exit:
A Error return code, if any.
Z set if no error.
7.6.23 @DIV16 SVC-94
This SVC will perform a division of a 16-bit unsigned integer by an 8-bit unsigned
integer.
Registers Affected: AF, HL.
Entry:
HL Should contain the dividend value.
C Should contain the divisor value.
Exit:
HL Returns the resultant value.
A Returns the remainder value.
7.6.24 @DIV8 SVC-93
This SVC performs an 8-bit unsigned integer divide.
Registers Affected: AF, E.
Entry:
E Should contain the dividend value.
C Should contain the divisor value.
Exit:
A Returns the resultant value.
E Returns the remainder value.
7.6.25 @DODIR SVC-34
This SVC will capture selected directory information for the logical drive referenced in
the SVC's invocation and either pass the information to your designated buffer or display
formatted information on the *DO device. A function number is passed in register B to
control the desired output.
Registers Affected: AF.
Display Filespecs
Entry:
B 0; Function to display the directory of visible files to *DO.
C The logical drive number (0-7) of the selection.
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