Enterprise (computer)

Zilog Z80-based home computer

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Enterprise

Developer| Intelligent Software
Type| Home computer
Release date| 23 June 1985; 40 years ago (1985-06-23)
Units shipped| 80,000
Operating system| EXOS, BASIC (on cartridge)
CPU| Zilog Z80A @ 4 MHz
Memory| 64 KB / 128 KB up to 4MB
Display| 80 × 256, 256 colours; 320 × 256, 4 colours; 160 × 256, 16 colours; 640 × 512 interlaced, 640 × 256 non-interlaced, 2 colours
Graphics| "Nick" ASIC
Sound| "Dave" ASIC (3 channels + noise)
Connectivity| RGB out, serial port, printer port, joystick ports, cassette tape interfaces, cartridge slot, expansion port

The Enterprise is a Zilog Z80-based home computer announced in 1983,[1] but due to a series of delays, was not commercially available until 1985.[2] It was developed by British company Intelligent Software and marketed by Enterprise Computers.

The specification as released was powerful and one of the higher end in its class (though not by the margin envisaged in 1983). This was due to the use of custom ASICs for graphics and sound which took workload away from the CPU, an extensive implementation of ANSI BASIC and a bank switching system to allow for larger amounts of RAM than the Z80 natively supported. It also featured a distinctive and colourful case design, and promise of multiple expansion options. Its two variants are the Enterprise 64, with 64 KB of RAM, and the Enterprise 128, with 128 KB of RAM.

The machine was renamed several times during development, being known variously as Samurai, Oscar and Elan. Versions can sometimes been found in magazine articles referred to by the preceding monikers.[3] Ultimately, not assisted by release delays and a changing market place, the Enterprise was not commercially successful. The manufacturer called in the receivers in 1986 with significant debt, although old stock continued to be sold through a German partner until well into the 1990s.[2]

## Hardware

[edit]

Enterprise 128 rear view Enterprise 128 right view

### CPU, memory and ASIC chips

[edit]

The Enterprise has a 4 megahertz (MHz) Z80 Central processing unit (CPU),[4] 64 KB (65,536 bytes) or 128 KB of RAM, and 32 KB (32,768 bytes) of internal read-only memory (ROM) that contains the EXOS operating system and a screen editor / word processor. The BASIC programming language was supplied on a 16 KB ROM module.

Two application-specific integrated circuit (ASIC) chips take some of the workload off of the central processor. They are named "Nick" and "Dave" after their designers, Nick Toop, who had previously worked on the Acorn Atom, and Dave Woodfield. "Nick" manages graphics, while "Dave" handles sound and memory paging (bank switching).[3]

A bank switching scheme allows the memory to be expanded to a maximum of 4 megabytes (4,194,304 bytes). The highest 2 address lines from the Z80 are used to select one of the four 8-bit Page Registers in the Dave chip. The output from the selected register is used as the highest 8 bits of the 22-bit address bus, while the lowest 14 bits come directly from the Z80 address bus.[5] Effectively, the 64 KB address space of the Z80 processor is divided into four 16k sections. Any 16k page from the 4 MB address space can be mapped to any of these sections. The lowest two pages (pages 0 and 1) of the 4 MB address space contain system ROM. The next four pages (2 to 5) are reserved for a ROM cartridge (max 64 KB). The top four pages (pages 252 to 255, totaling 64 KB) are used as video RAM, but can be used for storage of program code and data as well. On the 128k model, the additional 64 KB of ram is mapped on pages 248 to 251. The remaining memory space can be used by external devices and memory modules connected to the expansion bus.

### Keyboard and case

[edit]

The case is unusual in that it contains both a full-sized keyboard with programmable function keys, and a joystick. Its distinctive shape was due to the designers' desire to break away from customary designs.[6] The low-profile keyboard is constructed with mechanical keycaps on top of a rubber membrane and has a standard layout, but the feel of the keys was disliked by many, or even most people, because the keys weren't "full travel", but had a squishy feel, similar to a Sinclair QL or Spectrum+. The joystick replaces the normal cursor keys, and allows the cursor to be moved diagonally.

Royal College of Art graduates Geoff Hollington and Nick Oakley were responsible for the design, having tendered for this particular contract, and had only seven days to produce the visual design concept. Tooling for production of the casing was also demanded in a rapid timeframe and took five months. Originally, a combination of greys was envisaged for the casing elements, but seeking to avoid the look of office equipment and to appeal to "the lower end of the market", the eventual dark grey case with red, green and blue keys was chosen.[7]

### Graphics

[edit]

Enterprise has four hardware graphics modes: 40-column text modes, Lo-Res and Hi-Res bit mapped graphics, and attribute graphics. The OS offers 80-column text via high-resolution graphics mode. Bit mapped graphics modes allow selection between displays of 2, 4, 16 or 256 colours (from a 3-3-2 bit RGB palette), but horizontal resolution decreases as colour depth increases. Interlaced and non-interlaced modes are available. The maximum resolution is 640 × 512 pixels interlaced, or 640 × 256 pixels non-interlaced. These resolutions permit only a 2-colour display. A 256-colour display has a maximum resolution of 80 × 256. The attribute graphics mode provides a 320 × 256 pixel resolution with 16 colours, selectable from a palette of 256.

Multiple pages can be displayed simultaneously on the screen, even if their graphics modes are different. Each page has its own palette, which allows more colours to be displayed onscreen simultaneously. The page height can be larger than the screen or the window it is displayed on. Each page is connected to a channel of the EXOS operating system, so it is possible to write on a hidden page.

### Sound

[edit]

The sound is handled by the second ASIC chip, "Dave", and has 3 sound channels plus a noise channel. Each channel's sound can be placed freely in the stereo image. Available effects include distortion, low-pass and high-pass filters, and ring modulation.

The Enterprise firmware also provides programmable envelope generators that are more flexible than synthesizers' traditional ADSR envelope, and allow up to 255 phases to be specified for each envelope. On each phase, the envelope can adjust the sound's pitch and stereo balance.

### Interfaces

[edit]

The Enterprise included an array of connectors far beyond what was common on home computers of the time. There is an RGB output, a RS-232 / RS-423 serial port, a Centronics printer port, two external joystick ports, two cassette tape interfaces, a ROM cartridge slot, and an ordinary expansion port. To save expense, many of the connectors did not use sockets, but instead had simple edge connectors that used the exposed traces at the edge of the printed circuit board.

The BASIC ROM can be replaced by a ROM that emulates a ZX Spectrum 48K, which allows the Enterprise to run the catalogue of thousands of Spectrum BASIC games and any other titles that don't access hardware directly; a hardware peripheral was available to provide more complete emulation for other Spectrum titles — catching Spectrum hardware accesses and issuing an interrupt so that emulation software can deal with them.

An external floppy drive became available later, and allowed access to CP/M programs, while at the same time being compatible with the MS-DOS disc format and FAT12 file structure (sub-directories etc.).

## Software

[edit]

### System ROM

[edit]

EXOS (Enterprise Expandable Operating System) is contained in the system ROM, and is based on "channels". All peripherals are accessed through channels, which allows the programs to treat all input and output devices identically.[8] The system ROM also contains a full-screen editor, which doubles as a simple word processor. It can edit text files and BASIC programs, as well as programs written in other languages. The editor uses the joystick for cursor control.

### IS-Basic

[edit]

Enterprise does not include BASIC or any other programming language in its internal ROM, unlike most other home computers of the time. Its BASIC interpreter was supplied on a 16k ROM cartridge, and the language can be changed by switching the cartridge, a system similar to that of Acorn's BBC Micro.

IS-Basic adheres to the ANSI BASIC standard.[9] It is a fully structured language whose wide set of control structures includes multi-line `IF...THEN...ELSE`, `SELECT...CASE`, `DO...LOOP` with `WHILE` and `UNTIL` conditions. The `WHILE` condition being at the begin and the `UNTIL` condition being at the end of the do-loop, and the ability to escape a loop with the `EXIT LOOP` statement. Procedures and functions can have both reference and value parameters, and local variables. Errors and other exceptions are handled with exception handlers.

IS-Basic has the unique ability to hold multiple programs simultaneously in memory. Each program has a separate set of global variables and line numbers, but the CHAIN statement makes it possible to call one program from another and pass parameters between them. Peripherals can be controlled directly from BASIC, so there is rarely a need to use `POKE` and `PEEK` statements. IS-Basic has the usual commands for drawing dots, lines, circles and ellipses and for filling areas, and supports Logo-style turtle graphics. Sound commands can be entered into a queue, and executed in the background while the program execution continues.

The basic was also noted as being long-winded, an example being the command to clear the screen was commonly abbreviated to `CLS`, on the enterprise the command was `CLEAR SCREEN` with no abbreviation possible.[2]

### Other software

[edit]

Several languages besides IS-BASIC, including Forth, Lisp, Pascal and assembly, were available on either ROM cartridge or tape. Basic-to-Basic converters could convert BASIC programs written for other home computers. Some 40 games, from IS and other publishers, were listed in the catalog.[10] IS-DOS, the CP/M compatible operating system, opened access to the wide range of CP/M programs available at that time.

## History

[edit]

1984 'Flan Computers' seen on an Enterprise 64's motherboard

After the 1982 introduction of the ZX Spectrum, Hong Kong trading company Locumals commissioned Intelligent Software, headed by international chess player David Levy, to develop a home computer in the UK. During development the machine had the codename DPC, which stood for damp-proof course, to confuse potential competitors. The machine was also known by the names Samurai, Oscar, Elan and Flan before the Enterprise name was finally chosen. The succession of name changes was mainly due to the discovery of other machines and companies with the chosen name. The odd choice of Flan emerged following the discovery that Elan could not be used (due to complaints from Elan Digital Systems of Crawley) but some documentation had already been produced with that moniker and it was thought the Elan name could easily be modified on printed materials.[3][11]

Entersoft, modelled after Amstrad's AMSOFT, was set up to ensure a steady supply of software for the new machine. Enterprise was announced to the press in September 1983, and some 80,000 machines were pre-ordered by the time of its April 1984 sales launch. The product did not ship until 1985, by which point the UK home computer market was already dominated by the ZX Spectrum, Commodore 64, Amstrad CPC and Acorn BBC Micro with the 16-bit era on the horizon. A successor machine, the PW360, was developed in 1986 to compete against the Amstrad PCW 8256, but the company was by then in severe financial difficulties, and closed down.

The home computer market had changed greatly from the time from the machine was announced to its release date. There had been a downturn, owing to market saturation. Large retailers proved reluctant to stock the machine, and smaller retailers were wary of stocking a machine not supported through the major retail channels. The hardware was still powerful for a home computer of the era, but there was a limited software catalogue and the price was higher than the competition. For example, the Amstrad CPC 464 included a monitor and cassette recorder, was released before the Enterprise, and retailed for less.[2] After the initial manufacturing run of 80,000 units, it is believed that no further units were made, so the Enterprise is among the rarer home computers of the 1980s.

The Enterprise had only minor success in the UK, selling no more that 25,000 units in this region, but did go on to have more impact in other countries. Enterprise Computers UK and Intelligent Software collapsed by 1986 but a German subsidiary survived until 1997 and shipped remaining stock to various countries including Egypt, Kazakhstan and the Czech Republic but most notably to Hungary.[12] The Hungarian company Videoton had produced a simplified version of the Enterprise called the Videoton TV Computer (TVC) under license that was mainly sold into Hungarian education. Hungary was then part of the Eastern Bloc which was subject to export controls and the TVC lacked the specialist Nick and Dave chips. Unsold Enterprise 128 stock though was imported into Hungary in 1987 (despite controls) and the machine became popular in the country, remaining on sale until around 1992.[11][13] A dedicated cult following for the machine still exists in Hungary.[14][15]

## Video games

[edit]

Most of the video games for the system are hobbyist ports from ZX Spectrum and Amstrad CPC. There are only 96 commercially released video games.[16]

Title  | Publisher  | Release year

|
|

Abyss, The  | Artificial Intelligence  | 1985
Adventure Quest  | Level 9 Computing  | 1984
Airwolf  | Elite Systems  | 1985
Alternative World Games  | Novotrade  | 1990
Animal, Vegetable, Mineral  | Bourne Educational  | 1985
Áttörés  | Novotrade  |
Batman  | Ocean Software  | 1986
Beach Head  | Dream Software  | 1985
Beatcha  | Romik Software  | 1984
Bruce Lee  | Ocean Software  | 1984
Bulldozer  | Wave-8  |
Caesar a cica  | Novotrade  | 1989
Castle of Dreams  | Widget Software  | 1985
Cauldron  | Entersoft  | 1986
Centrum Ball  | Novotrade  | 1987
Chains  | Artificial Intelligence  | 1985
Colossal Adventure  | Level 9 Computing  | 1985
Cross Road Race  | a Studio  | 1988
Csavargás a gombák birodalmában  | Octasoft  |
Cyrus Chess II  | Intelligent Chess Software Ltd.  | 1985
Devil's Lair  | Loriciels  | 1985
Diamonds  | Infosoft  | 1989
Dictator  | Entersoft  | 1984
Digipók  | Novotrade  | 1987
Dot breaker, Dot collector  | Enterprise Computers  | 1987
Dungeon Adventure  | Level 9 Computing  | 1984
Eat it up  | Nielsen  | 1989
Eden Blues  | Novosoft  | 1986
Eggs of Death  | Novotrade  | 1985
Emerald Isle  | Level 9 Computing  | 1985
Enterball  | a Studio  | 1988
Enter-Stack  | a Studio  | 1987
Fantasia Diamond  | Hewson Consultants  | 1985
Fantomas  | a Studio  | 1987
Fire  | a Studio  | 1988
Five in a Row  | Entersoft  | 1984
Games Pack 1 (Eddie the Exterminator, Windsurfer)  | Entersoft  | 1984
Games Pack 2 (Bomb Squad, Death Diver)  | Entersoft  | 1984
Games Pack 3 (Galaxians, Space Orbs)  | Boxsoft  | 1986
Get Dexter  | Infogrames  | 1985
Grid Trouble  | Enterprise Computers  | 1987
Happy Letters  | Bourne Educational  | 1985
Happy Numbers  | Bourne Educational  | 1985
Heathrow ATC  | Hewson Consultants  | 1984
Hopeless Game  | F.T. Studio  |
Hubert  | Novotrade  |
Hungaroring Forma 1  | Novotrade  | 1987
Impossible Mission 2  | Novotrade  | 1988
Jack's House of Cards  | Romik Software  | 1985
Jammin  | Enterprise Computers  | 1985
King of the Castle  | Artificial Intelligence  | 1985
Körmöci Arany  | a Studio  | 1988
Lands of Havoc  | Microdeal  | 1985
Laser  | a Studio  | 1989
Lords of Time  | Level 9 Computing  | 1984
Magic Ball  | Boxsoft  | 1987
Market, The  | High Tech Software  | 1985
Mirror World  | Novotrade  | 1986
Mordon's Quest  | John Jones-Steele, Peter Moreland and Peter Donne  | 1985
Nautilus  | Octasoft  | 1986
Newton almája  | Octasoft  | 1987
Nodes of Yesod  | Odin Computer Graphics  | 1985
Orient Express  | Artificial Intelligence  | 1985
Out of This World  | Boxsoft  | 1987
Pacman  | Boxsoft  | 1986
Permolift  | a Studio  | 1988
Playground (Adventure)  | Widgit Software  | 1985
Poszeidón kincse  | Novotrade  | 1989
R2-D2  | Wave-8  | 1989
Rabló Rulett  | Novotrade  | 1987
Race Ace  | Artificial Intelligence  | 1985
Raid (over Moscow)  | U.S. Gold  | 1985
Return to Eden  | Level 9 Computing  | 1984
Reversi, Dáma, Awari  | Novotrade  | 1987
RX-220  | Novotrade  | 1989
Snowball  | Level 9 Computing  | 1984
Sorcery  | Virgin Games  | 1985
Space Bubble  | Infosoft  | 1989
Space Pirate  | Enterprise Computers  | 1987
Spanish Gold  | Chalksoft  | 1985
Starstrike, 3D  | Realtime Software  | 1984
Steve Davis Snooker  | CDS Software  | 1985
Submarine Commander  | Entersoft  | 1985
Super Pipeline 2  | Enterprise Computers  | 1985
Tejútvesztő / Labyrinth  | Novosoft  |
Tetris  | Boxsoft  | 1986
Tili-toli  | Wave-8  | 1989
Tombs of Doom  | Enterprise Computers  | 1985
Turbó Rudi  | Novotrade  |
Tutti Frutti  | Wave-8  | 1988
Unicum  | Wave-8  | 1988
Up & Down  | a Studio  | 1989
Williamsburg Adventure 3  | Microdeal  | 1985
Wizard's Lair  | Bubble Bus  | 1985
Wordhang  | Bourne Educational  | 1985
Wriggler  | Romantic Robot  | 1985

## Enterprise emulators

[edit]

* Clock Signal for macOS and Linux
* EP128Emu for Windows and Linux
* EP32 for Windows
* JSep - JavaScript Enterprise-128 emulator

## References

[edit]

1. ^ Kewney, Guy (November 1983). "Elan vital". Personal Computer World. pp. 114–116. Retrieved 22 May 2021.
2. ^ a b c d Smith, Tony (24 October 2013). "Phantom Flan flinger: The story of the Elan Enterprise 128". The Register.
3. ^ a b c Jones, Meirion (January 1984). "The Elan Story". Your Computer. 4 (1): 78–85.
4. ^ Mace, Scott (6 February 1984). "British firm unveils micros at Consumer Electronics Show". InfoWorld. 6 (6): 62. ISSN 0199-6649. "The Enterprise's Z80 runs at a speed of 4 MHz, [...]"
5. ^ Enterprise Technical Information. Enterprise Computers Ltd. 1984.
6. ^ "Enterprise Review". Your Computer. 5 (2): 46–48\. February 1985.
7. ^ Robinson, Colin (November 1983). "Enterprise out of the ordinary". Design. pp. 62–63. Retrieved 16 March 2022.
8. ^ Enterprise Programming Guide. Enterprise Computers Ltd. 1984.
9. ^ Gordon, Alan M. (1985). Super Programmer — Professional programming in ANSI Standard BASIC. Sigma Press. ISBN 1-85058-002-2. "The Enterprise 64 Computer ... is one of the few micro computers to implement Full ANSI BASIC"
10. ^ Lindgren, Pauli. "Mikä Enterprisessa oli vikana?" [What was wrong with Enterprise?]. Printti (in Finnish) (13/1986): 5–6.
11. ^ a b Packwood, Lewis (2023). Curious Video Game Machines. Pen & Sword. ISBN 978-1399073776.
12. ^ "Q&A with Werner Lindner (technical director of the ENTERPRISE Computers GmbH)". enterpriseforever.com. Retrieved 11 November 2023.
13. ^ Graham, Adrian (2023). "Enterprise Computers". Binary Dinosaurs.
14. ^ "Home". Enterpress News (in Hungarian). Retrieved 11 November 2023.
15. ^ "Index". Enterprise Forever. Retrieved 11 November 2023.
16. ^ "Enterprise games". Z80 Computer Museum. Retrieved 3 April 2025.

## External links

[edit]

Wikimedia Commons has media related to Enterprise 64/128.

* Enterprise Forever forum
* Hungarian page about Enterprise
* Hungarian Enterprise forum
* The German version was apparently called Mephisto PHC 64
* e64 revisited \- a game-oriented history of the Enterprise
* 1000BiT in English and in Italian