Tandy 1000 Programmer's Reference Guide

Chapter 1 I System Calls
ChDir
Change the Current
Directory
Function Call
3BH
Sets the current directory to the directory specified. If
any member of the specified pathname does not exist, then
the current directory
is unchanged.
Entry Conditions:
AH = 3BH
DS:DX
= pointer to ASCZIZ pathname
Exit Conditions:
Carry set:
AX
= error code
Carry not set:
No error.
Error Returns:
A=3
Path not found. The path specified either indicated
a
file or the path was invalid.
Example:
ChDir eq" 38H
Ids dx,pathname
mov ah,ChDir
int 21 H
105

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