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I am no longer active in this hobby for the foreseeable future. 
I will no longer maintain or update the website, but I will leave it accessible to the web for as long as possible (years).


DG Systems
System Cards
Printer A & B
Disk Drives
Magazine Ads

Mark-8 Minicomputer
MOS Kim-1
Imsai 8080
TV Typewriter
The Digital Group



Digital Group Software

The Digital Group offered a wide variety software applications for the Z80 and 8080 systems (sadly, none for the other processors they sold). The offerings exceeded those of most other hardware manufactures. DG was really on the cusp of world domination in 1976-77! They were far ahead of the pack for a very long time--until they stumbled! Much of the success they did enjoy was attributable to the software packages available at the time. 

This page has screen-shot examples of several running programs and downloadable files for software documentation, as well as audio image files in the mp3 format to load the program on to your own Digital Group computer system. If you do not own a Digital Group computer, you can listen to what DG owners listened to while loading software those many years ago! 

Please Be Kind...

I have limited bandwidth! Download only what you know you want or need, and take your time--only download what you need right now, then save what you download so you need not download it again. Thanks, and enjoy!

2009-01-21_dg_software 005.jpg (515169 bytes)
A small sampling of DG software and media



Notes on Audio Image Files

These files are the software for Digital Group Z80 audio based systems. Play directly from your PC or a CD player. Connect the output from your PC audio card to the dg system audio input. Set your PC volume controls to maximum (For most PC audio cards) - this can be done by clicking the speaker icon in the system tray, and raising the wav and master sliders to max. Start the audio file playback, wait 1-2 seconds and then press the RESET button on your dg system.

These files are color coded according to source:

Analog Copies These files are direct copies from an audio cassette, converted directly to mp3 format. Some are readable, some are not. Some of the cassette's were in poor shape, and were only getting worse with time.By copying to the PC, the data has been preserved as-is and gives me more time to recover it before the tapes degraded further. The files were played into the PC using a professional tape deck of extraordinary quality.

Some of these files are unreadable without errors. Many or the images here contain several data bursts as originally supplied. the "OpSys" tapes for example, contained several programs on one tape. These images have been recorded into a single file, so keep listening! You may find something new!

Digital Copies These files were read into a digital group computer, checked to some degree, then saved directly to the wav digital format, then converted to mp3's. For the most part, these should all work.

Although there are no disk images here, most DG software had provision to run on audio based systems. So, with only a few possible exceptions, I will be able to save even "disk only" titles to audio images. Look for more titles--eventually!

Creating a Digital Copy

Copying programs from the original audiocassette to wav or mp3 files is tedious and time consuming! Here is how it has been done with these files:

First, the program is loaded into a working Digital Group system from an audiocassette or wav file and is briefly checked for proper operation, this is often only a cursory testing! In some cases, the software has the option to self-copy. If this is the case, the next step is skipped.

A special program copier, is loaded into the DG machine from a wav file. The application software is then loaded, again, by cassette into the program’s buffer memory. The program is then examined for memory usage, and that information is used to set the cassette write extents automatically.

From there, the data is dumped via the cassette write command to the audio board in my late model PC, and saved to wav format. I then use an application called Goldwave to run the file through a low-pass filter to clean it up a bit.

After this is done, I test the application for a good load from the wav file. Sometimes I test a little further, sometimes I don’t… The file is then converted to mp3 format to save on disk space. 

Although I have made an attempt to verify most of the programs, it is not always practical to verify every one and/or every aspect of each program. As a result, some programs may contain bugs. Either original bugs from the original software developers, or those that have crept in from the conversion process. Also, some programs just won’t load at all. Maybe reading them into the copy program and then repairing the damaged data areas manually can save them, or maybe further processing of the audio image may be helpful. I don’t know, but for this reason, unreadable analog copies are available with the notation “unreadable”.



Software Applications, Documentation, and Screen-Shots:

Business Basic 1.0 by MicroWorks was an expansion of Digital Groups MAXI-BASIC, and added some much needed features for weary programmers. One new feature was AUTO numbering of lines. What a pain it was to do that manually! Another was the TRACE statement for debugging. Other features were geared for the business user and programmers of business applications for saving and retrieving data from the Phi-Deck tape drives. 

In my search for documentation for V1.0, I found one of the authors, Gary Shell. Click here to read his story of MicroWorks.

businessbasic_1_0.pdf - 1.0 Meg Low quality scan, done long ago.
bus_basic_1-2_changes.pdf - 321 KB
What's new in Version 2.0.
businessbasic_2_2.pdf - 2.2 Meg

BusinessBasic1_0.mp3 - 1.9 Meg Obviously, this analog copy works. :)

WOPROC 1.0 A contraction of "Word Processor", was written by Jerry Nix. This was an early word processor program that offered a valid reason to own a computer. The ability to write, save, modify, format and print documents was absolutely fantastic for a typewriter based world! You youngsters have no idea! :)

Although the program was greeted with great fanfare, the reality included some frustration. Not for lack of features, they were great, but for the problems! This was not unusual for programs of the day, but WOPROC could eat your document and your sanity, if you were unlucky enough to find a bug.

MANUSCRIPTOR, another word processing application, received rave reviews. This was MicroWorks' flawless entry into word processing. I do not have a copy, but I sure would like one! If you can help, let me know!

woproc.pdf - 1.2 Meg

woproc.mp3 - 3.9 Meg Audio based (Cassette side 2)
woproc_phimon_version.mp3 - 3.9 Meg
Phideck based (Cassette side 1)
woproc-ascii_art-spock-by_bryan.mp3 - 374 KB Click to see Spock.
woproc-alternate_source.mp3 - 3.8 Meg
Audio based from 2nd source.

GALAXY was Scelbi's version of the popular computer game based on the '60's TV series Star Trek. They didn't invent the game, just this version. Star Trek was a frequently played game on college computers in the seventies. When I was a young nerd, I used to drag my friends to the local college to play it on the computers in the library--until we were chased out. Repeatedly.

There was no live action, everything was text based. It was a game of strategy and played like a game of chess. You made a move, the Klingons made a move, etc. My boys have played Age of Empires on their computers, this was a type of very early forerunner.

galaxy_z80.pdf - 333 KB The DG instructions, no source listing.
galaxy_6800.pdf - 35.2 Meg Big file! Hey! a 6800 program! Not ported for a DG system. :(
galaxy_game_8008-8080.pdf - 23.1 Meg Another big file, not the DG version here, but the original. Good reading :)

galaxy_universal.mp3 - 2.1 Meg
- 1.5 Meg
Galaxy-32char.mp3 - 704 KB

Real Time Lunar Lander was a pretty good simulation game for owners of early computers. ...You are in a space capsule headed to the moon when your flight computer fails... the challenge is to land safely on the lunar surface by controlling thrusters with limited fuel, fighting gravity and inertia. Avoid rocks and mountains, and don't tip over or hit too hard! Just because the graphics are crude by today's standards, do not assume this is easy! You can spend hours playing and never make it down alive once. Gives you a healthy respect for the real astronauts.

Early programmers took pride in the accuracy of the formulas used to compute the simulation.

LunarLander.pdf - 736 KB

LunarLander-RT.mp3 - 844 KB 



Software Documentation

assembler.pdf - 1.8 Meg
Assembler_II.PDF - 1.5 Meg
casino_games.pdf - 217 KB
diskmon.PDF - 3.6 Meg
disassembler.pdf - 787 KB
editor-formatter_vol1.pdf - 1.9 Meg
editor-formatter_vol2.pdf - 6.8 Meg
educator_z80.pdf - 0.7 Meg
manscr_add_driver.pdf - 1.7 Meg
Add a driver to Diskmon for Manuscriptor. Now if only I could find Manuscriptor!
Maxibasic_1_0.PDF - 1.0 Meg
Maxibasic_1_1.PDF - 1.0 Meg
Maxibasic_2_0.PDF - 696 KB
maxibasic_gameset_1.pdf - 1.1 Meg
maxibasic_gameset_2.pdf - 0.8 Meg
maxibasic_gameset_3.pdf - 1.1 Meg
maxibasic_gameset_4.pdf - 0.8 Meg
maxibasic_gameset_5.pdf - 1.3 Meg
maxibasic_gameset_6.pdf - 0.8 Meg
maxibasic_gameset_7.pdf - 1.4 Meg
maxibasic_gameset_8.pdf - 0.8 Meg
maxibasic_gameset_9.pdf - 1.0 Meg


microchess.pdf - 0.6 Meg
Minibasic.PDF - 1.6 Meg
object_code_relocator-z80.pdf - 1.9 Meg
phimon.pdf - 10.5 Meg
phimon_start.pdf - 609 KB
phimon_upgrade_program.pdf - 91 KB
printer_driver-short_version.pdf - 818 KB
stepper_1_0.pdf - 704 KB
stepper_2.pdf - 948 KB
stepper_3.pdf - 1.8 Meg
super_clock.pdf - 952 KB
text_editor_z80-8080.pdf - 0.5 Meg 
three_part_mem_test.pdf - 112 KB
Tinybasic.PDF - 2.2 Meg
Tinybasic_Gamesets.PDF - 1.2 Meg
object_code_relocator-z80.pdf - 1.2 Meg
z80_distribution_cassette.pdf - 431 KB
z80opsys_32char.PDF- 2.4 Meg
z80opsys_64char_new_ver.pdf - 2.6 Meg
ham-1.pdf - 353 KB
Before the Ham card came out, there was this.


Analog Audio Image Copies

Again, these files may not work without extensive audio filtering and multiple attempts--then again, they may work just fine. Also note that there are some redundant files here, since I often have more than one source, I often make a copy from each to improve the chance of getting an error-free copy.

Assembler.mp3 - 1.9 Meg
Assembler_TVC64-unreadable.mp3 - 2.7 Meg
DisAssembler.mp3 - 1.2 Meg
Educator.mp3 - 2.3 Meg
FloppyDiskOpSys_V1_0.mp3 - 370 KB
Ham-1_V2.mp3 - 682 KB
ham_interface_programs-an.mp3 - 9.6 Meg
HMON_2_DblDensCtrl.mp3 - 1.7 Meg
KingdomLife.mp3 - 702 KB
Kingdom-Life_TVC64.mp3 - 680 KB
MaxiBasic_V1.mp3 - 1.9 Meg
MaxiBasic2_V2.mp3 - 1.4 Meg
MicroChess_TVC64.mp3 - 810 KB
maxi-basic_games_set2-an.mp3 - 5.8 Meg


ObjectCodeRelocator.mp3 - 1.3 Meg
OpSysTVT32-64.mp3 - 3.8 Meg
PhiMonMaker.mp3 - 1.0 Meg
PUP-1_PhiMon_2.mp3 - 2.5 Meg
pup-1_phimon_upgrade_2-an.mp3 - 4.3 Meg
z80-8080phideck_routines_2-an.mp3 - 3.6 Meg
SargonChess.mp3 - 1.4 Meg
Stepper_2.mp3 - 542 KB
TextEditor_Universal.mp3 - 2.4 Meg
TiniBasicGameSet_5.mp3 - 3.7 Meg
TinyBasic_Baudot.mp3 - 916 KB
TinyBasic10K.mp3 - 644 KB
tiny_basic_game_set4-an.mp3 - 2.7 Meg


Digital Audio Image Copies

Digital Copies are divided into three sections based on the video card they are compatible with. If you get the wrong one, no harm done, but the characters will not line up properly across the screen. The Universal works by either inserting a space after every character, for 64 character lines, or not, for 32 character lines. Effective, but wasteful. Best to use the version written for the card in use.

Universal - works with either video card:

business_100-universal.mp3 - 3.6 Meg
- 2.3 Meg
- 4.4 Meg
- 4.4 Meg
- 4.4 Meg
- 1.9 Meg
- 3.3 Meg
- 2.2 Meg
- 416 KB Modifies Maxi-Basic with Baudot printer routines. 
- 414 KB Modifies Maxi-Basic with Selectric printer routines


32 Character Video Card:

assembler-32char.mp3 - 2.0 Meg
- 2.1 Meg
- 4.4 Meg
- 1.7 Meg
z80_loadtape_prog-1 hamdemo-32char.mp3
- 458 KB
z80_loadtape_prog-2 flag-32char.mp3
- 454 KB
z80_loadtape_prog-3 braintease-32char.mp3
- 458 KB
z80_loadtape_prog-4 memtest-32char.mp3
- 458 KB
z80_loadtape_prog-5 freq-32char.mp3
- 444 KB
- 444 KB

64 Character Video Card:

dynamic_ram_test(1).mp3 - 474 KB
- 476 KB
- 476 KB
- 938 KB
- 724 KB
- 428 KB
- 396 KB
- 386 KB
- 368 KB
- 428 KB
- 4.4 Meg
- 1.9 Meg
- 4.1 Meg
- 406 KB


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Copyright © 2008 Bryan's Old Computers
Last modified:
October 16, 2009