Atari DOS 2.5 Source Code
Back to current versionRestore this version

Atari DOS 2.5 Source Code from OSS ; (C) 1985 Atari, Inc. and OSS, Inc.#

TITLE "FMS - Dual Density for Atari 1050 drives (2.50)"
PAGE " --- Copyright and Author Notice ---"

Copyright (c) 1978,1979,1980,1982,1984
Optimized Systems Software, Incorporated
San Jose, California

THIS PROGRAM MAY NOT BE REPRODUCED,
STORED IN A RETRIEVAL SYSTEM, OR
TRANSMITTED IN WHOLE OR IN PART,
IN ANY FORM, OR BY ANY MEANS, BE IT
ELECTRONIC,MECHANICAL, PHOTOCOPYING,
RECORDING, OR OTHERWISE WITHOUT THE
PRIOR WRITTEN PERMISSION OF
OPTIMIZED SYSTEMS SOFTWARE, INC.
1221-B KENTWOOD AVENUE
SAN JOSE, CALIFORNIA 95129 (U.S.A.)

PHONE: (408) 446-3099

Originally designed and coded by
Paul Laughton of Shepardson Microsystems, Inc.

Modified for Atari 1050 and 130XE by
Mark Rose & Bill Wilkinson
of O.S.S., Inc.

January, 1985
This is the working source code from OSS, Inc. for the Atari DOS 2.5 system software. We deeply thank:

Paul Laughton
Mark Rose
Bill Wilkinson

for writing the software and the following users from AtariAge:

ndary
bob1200xl
ivop
Urchlay

for preserving the source code for generations to come.

How to build Atari DOS 2.5 from OSS#

First, please read these two text files:
Then, please go on with these disk images:

The above image builddos.atr needs the following source files. Here we can go on in two ways:

a) the easy one:

If you have booted with the above disk image, please insert either the dossrc_a-w.atr image or the dossrc-w.atr image in drive 2 (D2:):

Then type:
LOAD #D2:FMS.M65
ASM
You should receive the following figure:
Successful assembled source code for the creation of DOS.SYS

Then insert either the dossrc_b-w.atr image or leave the dossrc-w.atr image in drive 2 (D2:):

Then type:
LOAD #D2:DUP.M65
ASM
You should receive the following figure:
Successful assembled source code for the creation of DUP.SYS

Congratulations! You have created the object code for building DOS 2.5. :-)))
On how to go on further, please read the recipe above.

b) the hard one:

The way is the same as in example a), except, that the below given original source files:

have to be patched to actually work. Please read the recipe above on how to this.