Virtual disks of TRS-80 "Disk Operating Systems"

This page contains Model 1, III, 4 and 4P Disk Operations Systems. These virtual disks are, in most cases, the original distribution disks converted to virtual disk. These virtual disks can be used with my emulator or to make real TRS-80 disks (on PCs with compatible drives) for use on a real TRS-80.

TRS-80 Model 1 Disk Operating Systems

 TRSDOS - DISK OPERATING SYSTEM - VER 2.1

 DOS READY
 _
 

TRSDOS
Version 2.1

The first major TRS-80 operating system. This is a must be experienced operating system to truly remember how primitive it really was in the early days of personal computing.

 TRSDOS - DISK OPERATING SYSTEM - VER 2.3

 DOS READY
 _
 

TRSDOS
Version 2.3

This was Radio Shack's second major release of their TRSDOS operating system. Many of the serious bugs were fixed in this version and there were several enhancements made.

TRSDOS
Version 2.7DD

Radio Shack's double density operating system. This version is pretty much a Model 1 version of TRSDOS 1.3 for the Model III.

The version posted here is a Percom Doubler patched version, Anyone with an original version please contact me.

LDOS
Version 5.3.1
by Misosys

One of nicest and easiest operating systems to use. Available late (after the Model III release) this operating system has many of the features found in operating systems of today (like PCDOS). With support for hard drives and compatibility with the Model 4's TRSDOS 6x (licensed version of LS-DOS) this operating system gave users a true taste of things to come. While during the TRS-80 days my favorite OS was NewDOS/80 (because of it's total flexibility) now in the days of the emulator with hard drives standard, LDOS and LS-DOS are my operating systems of choice.

LDOS v5.3.1 Hard Disk Drivers & Utilities

This disk contains drivers and utilities for using Radio Shack hard drives with LDOS on a real TRS-80 Model 1 or emulator v5.5 and above.

This disk contains
RSHARD1/CMD WD1010 HDC driver. Will control 1 to 2 drives of up to 1024 cylinders and 8 heads. Allows partitioning of HD into logical drives based on cylinder and head.
When using this driver with the emulator, use the 'R' parameter when entering device number (ex. 1R) to instruct the driver that the HD is removable.
RSFORM1/CMD WD1010 HDC format utility to use with RSHARD1/DCT.
RSFORM1A/CMD WD1010 HDC format utility to use with RSHARD1/DCT. This version has been modified to put the directory on cylinder 1.
To quickly format a virtual HD on the emulator use the command:

RSFORM1A (SYSTEM=YES,VERIFY=NO)

(The virtual disk is a LDOS data disk)

 NEWDOS - DISK OPERATING SYSTEM - VER 3.0

 THE BOOT, DIR, SYS0-SYS6 AND FORMAT PORTIONS OF THIS DOS
 ARE BASED UPON THE ORIGINAL MODULES OF TRSDOS 2.1
 ORIGINALLY COPYRIGHTED BY RANDOLPH COOK, 1978.
 UPGRADES AND ALTERATIONS ARE BY APPARAT, INC.

 DOS READY
 _
 

NEWDOS Plus
by Apparat

Produced by Apparat, NewDOS+ is basically a reworked version of the TRSDOS 2.1 operating system. NewDOS+ came with several nice utilities but it's nicest feature was the fact it was bug free, giving TRS-80 users their first taste of error free disk operations.

NewDOS+ doesn't have a BACKUP command but instead uses the COPY command to make an image backup. Thanks to the information I received from "Skipp May" I was able to determine the format of the COPY command, it is:

COPY :X TO :Y 00/00/00

Double-Zap/II

Double-Zap/II is a double density modification for NEWDOS 2.1+. Distributed by OMNICOMP, it enables NEWDOS+ to use a Percom double density controller.

NEWDOS/80
Version 2.0
by Apparat

Apparat had many releases of their NewDOS operating system before this, their best. This version gave users true power to control their TRS-80. Perfect for the power user with a non-standard system. Once the user understood the PDRIVE and SYSTEM commands they had full control of their TRS-80. This system could exchange data between all Model 1 and Model 3 operating systems and between dissimilar systems without the need to convert first to an interchange format. While being the most complicated OS to use it was also the most flexible and popular among TRS-80 power junkies.

 DBLDOS - DISK OPERATING SYSTEM - VER 4.34
 ORIGINAL DOS COPYRIGHTED BY TANDY CORPORATION
 DOUBLE DENSITY ADAPTATION COPYRIGHT 1980
 BY PERCOM DATA CO. INC.

 DOS READY
 _
 

Double DOS
Version 4.xx
by Percom Data

This DOS was distributed with Percom's double density controller.

DOSPLUS
Version 3.5
by Micro-Systems Software

Said to be the first serious double density Model 1 operating system.

MULTIDOS
Version 1.5SK
by Cosmopolitan Elec. Corp.

 ULTRADOS DISK OPERATING SYSTEM VERSION 4.2


 DOS READY
 _
 

UltraDOS
Version 4.2

This DOS is very similar to NEWDOS Plus. It also came with lots of nice utilities.


UltraDOS doesn't have a BACKUP command but instead uses the COPY command to make an image backup. The format of the COPY command is:

COPY :X TO :Y 00/00/00

 BACKUP - VTOS DISK BACKUP UTILITY - VER 3.0
 COPYRIGHT (C) 1979 RANDOLPH COOK, ALL RIGHTS RESERVED

 *** THIS IS YOUR 'MASTER' VTOS 3.0 DISKETTE ***

 *** MAKE A BACKUP 'SYSTEM' DISK TO RUN FROM ***

 DESTINATION DRIVE NUMBER ? _
 VTOS - VIRTUAL TECHNOLOGY'S OPERATING SYSTEM - VER 3.0
 COPYRIGHT (C) 1979 RANDOLPH COOK, ALL RIGHTS RESERVED

 DOS READY
 _
 

VTOS
Version 3.0

This system was written by Randy Cook (the writer of TRSDOS). It is pretty much a patched version of TRSDOS with a few new features. It was more stable than TRSDOS but was distributed on a protected disk making it a pain to backup and limiting it's popularity. The virtual disk is in it's original protected form.

This virtual disk requires at least version 5.00 of the emulator to run. 

TRS-80 Model III Disk Operating Systems

TRSDOS
Version 1.3

Model III TRSDOS was a great advancement over Model 1 TRSDOS.
While still very limited at least it worked reliably.

LDOS
Version 5.3.1
by Misosys

One of nicest and easiest operating systems to use. The Model III release has many of the features found in operating systems of today (like PCDOS). With support for hard drives and compatibility with the Model 4's TRSDOS 6x (licensed version of LS-DOS) this operating system gave users a true taste of things to come. While during the TRS-80 days my favorite OS was NewDOS/80 (because of it's total flexibility) now in the days of the emulator with hard drives standard, LDOS and LS-DOS are my operating systems of choice.

LDOS v5.3.1 Hard Disk Drivers & Utilities

This disk contains drivers and utilities for using Radio Shack hard drives with LDOS on a real TRS-80 Model III/4 or emulator v5.5 and above.

This disk contains
RSHARD5/CMD WD1010 HDC driver. Will control 1 to 2 drives of up to 1024 cylinders and 8 heads. Allows partitioning of HD into logical drives based on cylinder and head.
When using this driver with the emulator, use the 'R' parameter when entering device number (ex. 1R) to instruct the driver that the HD is removable.
RSFORM5/CMD WD1010 HDC format utility to use with RSHARD5/DCT.
RSFORM5A/CMD WD1010 HDC format utility to use with RSHARD5/DCT. This version has been modified to put the directory on cylinder 1.
To quickly format a virtual HD on the emulator use the command:

RSFORM5A (SYSTEM=YES,VERIFY=NO)
ARCHIVE5/CMD
RESTORE5/CMD		 Hard disk utility to backup and restore files to large to fit onto a single floppy disk

(The virtual disk is a LDOS data disk)

NEWDOS/80 Version 2.0
Model III/4/4P

Model 4P bootable NEWDOS/80

The Model 4P versions of NEWDOS/80 have a special MODELA/III ROM image file that allows them to boot on the Model 4P. The 4P versions will boot on a Model III, 4 or 4P system.

The MODELA/III file is the standard TRSDOS v6.xx file that has been padded and placed on the NEWDOS/80 disk so it aligns with LDOS's six sector/granule structure. The file also has 3 sectors of a LDOS DIR/SYS embedded in it so that it aligns with a real track boundary.

The 3rd byte of sector 1 on track 0 (boot sector) has been modified to point to the embedded LDOS directory in the MODELA/III file. This byte is not used by NEWDOS/80 since it uses the 3rd byte of sector 0 to find the directory lump. During a Model 4P boot this byte is used to find the directory track of an LDOS disk, search for the MODELA/III file entry and then load the MODELA/III file. Pointing the 3rd byte at the embedded LDOS directory allows the 4P to find the MODELA/III file and load it.

The 4P version of NEWDOS/80 can be used almost exactly like the regular version of NEWDOS/80, but because of the exact placement of the MODELA/III file on the 4P disk and the 1 byte modification of the boot sector certain guidelines must be obeyed or the original disk or its copies will be unbootable on a Model 4P.

  • The MODELA/III cannot be modified, deleted, moved or recopied onto the NEWDOS/80 4P disk. Doing so will result in the disk being only Model 3/4 bootable.

  • The MODELA/III files on the single & double sided 4P disks are not the same and because of the padding and embedded LDOS directory are not compatible with other DOSs. However, the actual ROM image that is loaded, is.

  • To make a 4P bootable copy use a type 5 copy using the BDU option, example:
    COPY 0,1,,BDU
    You can use this method to make a real Model 4P boot disk in a compatible PC drive.

  • Copying the 4P NEWDOS/80 disk to a disk of a different configuration by using a type 6 copy will result in the disk being only Model 3/4 bootable.

DOSPLUS
Version 3.5
by Micro-Systems Software

MULTIDOS
Version 1.6
by Cosmopolitan Elec. Corp.

TRS-80 Model 4 Disk Operating Systems

TRSDOS
Version 6.2

Model 4 version of TRSDOS. Written by Logical Systems (writers of LS-DOS).
This is the first Radio Shack operating system as good as their computer.

SIX2XTND(C) Version 1.2.2 06/06/87 - UPDATE FOR TRSDOS 6.2.x Model 4

This software consisting of a set of patches and a conversion program will enable you to continue to use your TRSDOS 6.2.x operating system past 1987 to the year 2092. The USER password has been eliminated, but all other passwords remain.

These patches are on a TRSDOS 6.2x data virtual floppy (.DSK). Read the docs in the .ZIP and on the .DSK for more info on what the patches do and how to apply them. I applied this patch to both my TRSDOS 6.20 and 6.21 operating systems without problems (read the instructions carefully).

LS-DOS
Version 6.3.1
by Misosys

Model 4 version of LDOS. Basically the same as TRSDOS 6.2 but with many bug fixes and enhancements most important of which is system dates well into the 21st century.

LS-DOS v6.3.1 Hard Disk Drivers & Utilities

This disk contains drivers and utilities for using Radio Shack hard drives with LS-DOS and TRSDOS 6.x on a real TRS-80 Model 4/4P or emulator v5.5 and above.

This disk contains
TRSHD6/DCT WD1010 HDC driver. Will control 1 to 4 drives of up to 406 cylinders and 8 heads. Allows partitioning of HD into logical drives based on head.
TRSFORM6/CMD WD1010 HDC format utility to use with TRSHD6/DCT.
TRSFRM6A/CMD WD1010 HDC format utility to use with TRSHD6/DCT. This version has been modified to put the directory on cylinder 1.
To quickly format a virtual HD on the emulator use the command:

TRSFRM6A (SYSTEM=YES,VERIFY=NO)
RSHARD6/CMD WD1010 HDC driver. Will control 1 to 2 drives of up to 1024 cylinders and 8 heads. Allows partitioning of HD into logical drives based on cylinder and head.
When using this driver with the emulator, use the 'R' parameter when entering device number (ex. 1R) to instruct the driver that the HD is removable.
RSFORM6/CMD WD1010 HDC format utility to use with RSHARD6/DCT.
RSFORM6A/CMD WD1010 HDC format utility to use with RSHARD6/DCT. This version has been modified to put the directory on cylinder 1.
To quickly format a virtual HD on the emulator use the command:

RSFORM6A (SYSTEM=YES,VERIFY=NO)
ARCHIVE6/CMD
RESTORE6/CMD		 Hard disk utility to backup and restore files to large to fit onto a single floppy disk
HDBT2/TXT
HDBOOT/FIX
HDSYS0/FIX		 Instructions and patch files for making a HD, with LS-DOS 6.3.1 loaded on it, bootable on a 4P (emulator 4P too).

(The virtual disk is a LS-DOS 6.x data disk)

 DOSPLUS IV - Model 4 Disk Operating System - Version 1.0
 (c) Copyright 1983, Micor-Systems Software Inc. Release: 2/84

 DOS PLUS
 _
 

DOSPLUS
Version 1.0
by Micro-Systems Software

MULTIDOS
Version 2.10
by Cosmopolitan Elec. Corp.

RAPIDOS
Version 2.0
by Rapidynamic Software, Inc.

CP/M Plus
Version 01.00.00
by Radio Shack & Digital Research

Model 4 version of CP/M Plus by Digital Research licensed to Tandy Corp.
The ZIP contains the 5 disk distribution.

Special thanks to Dennis Yutani for sending me the disks for conversion.

This version of CP/M supports RS hard disks and under v5.5 of the emulator and can access up to four 5meg virtual hard disks.

Create and mount a 5meg HD (153 cylinders 4 heads) and then run CPMINIT.COM (found on disk #5) to initilize the CP/M directory. By default HDs 0,1,2 & 3 are E:, F:, G: & H:.

This CP/M may also be able to access larger HDs but I'm unfamiliar with generating CP/M. It may also be possible to put a system on the first virtual HD so that in Model 4P mode the emulator can boot CP/M from the HD.

CP/M
Version 2.2
by Montezuma Micro

Model 4 version of CP/M by Montezuma Micro.
This was the most important advancement made available with the Model 4, access to a multi-platform operating system. CP/M gave TRS-80 users access to the rest of the Z80 world.