Tandy 1000 Programmer's Reference Guide

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 at 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.
write-5eq macro fcb
mow dx,offsetfcb
mow ah,lSH
int 21 H
endm
60

Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200