Tandy 1000 Programmer's Reference Guide

Chapter 6 I BIOS Services
Disk I/O Support for the Floppy Only
System Configuration
Software Interrupt:
13 hex (19 dec)
Function Summary:
AH = 0: Reset Floppy Disk
AH = 1: Return Status of Last Floppy Disk Operation
AH = 2: Read Sectorb) from Floppy Disk
AH = 3: Write Sector(s). to Floppy Disk
AH = 4: Verify Sector(s) on Floppy Disk
AH = 5: Format Track on Floppy Disk
Function Descriptions:
Reset Floppy Disk
Reset the diskette system. Resets associated hardware and re-
calibrates all diskette drives.
Entry Conditions:
AH = 0
Exit Conditions:
See “Exits From All Calls” below.
Return Status of Last Floppy Disk Operation
Return the diskette status of the last operation in AL.
En try Conditions :
AH = 1
Exit Conditions:
AL = status of the last operation; see “Exits Fkom All Calls” be-
Read Sectorb) from Floppy Disk
Read the desired sectorb) from disk into RAM.
low for values
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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