Tandy 1000 Programmer's Reference Manual page 62

Chapter 1 I System Calls
SeqWrite
Sequential Write
Function Call 15H
Writes a record sequentially. The record pointed to by the cur-
rent block (offset OCH) and the current record (offset 20H) fields
of the FCB is written from the Disk Transfer Address. The cur-
rent block and current record fields are then incremented.
The record size is set to the value at offset OEH in the FCB. If
the record size is less than a sector, the data a t the Disk Trans-
fer Address is written to a buffer. The buffer is written to disk
when it contains a full sector of data, when the file is closed, or
when Function Call ODH (Reset Disk) is issued.
Entry Conditions:
AH
=
15H
DS:DX
=
pointer to the opened FCB
of
the file to write
Exit Conditions:
If AL
=
00H, the write was completed successfully.
If AL
=
01H, the disk was full; the write was canceled.
If AL
=
02H, there was not enough room in the disk transfer
Macro Definition:
segment
to
write 1 record; the write was canceled.
w r i t e - 5 e q m a c r o f c b
mow
d x , o f f s e t f c b
m o w a h , l S H
i n t 21 H
endm
60