Thorn EMI Liberator

Last updated
Thorn EMI Liberator
Developer Thorn EMI Datatech [1]
Type Portable computer
Release date1985
DiscontinuedSeptember 1986
Operating system CP/M
CPU Zilog Z80A
Memory40 kB of internal RAM as standard
Graphics LCD (480 x 128 pixels)/ (80 columns by 16 lines of text)

The Thorn EMI Liberator was a laptop word processor, produced in the United Kingdom by Thorn EMI Datatech, then in Feltham Middlesex, primarily intended for use by UK Government civil servants. [2] Released in 1985, it is considered to be the first mass-produced British laptop. Thorn EMI Datatech simultaneously held the contracts for the repair of the Sinclair ZX80 and ZX81.

Contents

History

The design of the Liberator was instigated in 1983 by the UK Government's Central Computer and Telecommunications Agency (CCTA). It was envisaged as a portable device to allow civil servants to write and print their own reports, rather than using the services of typists. The CCTA initially contacted Dragon Data to develop the product, but the company went into administration shortly afterwards, and the engineering team were taken on by Thorn EMI to continue the project in 1984.

The team consisted of five former Dragon Data employees. Derek Williams headed up the business side of the endeavour, working closely with the CCTA and Thorn EMI senior management. John Peacock managed the finances, vendors, and component suppliers. Jan Wojna designed the hardware and packaging of the electronics into the custom designed case. Duncan Smeed wrote the low level system software and worked closely with Digital Research on the operating system implementation. John Linney created the embedded word processor and terminal emulation applications.

The Liberator entered limited production in early 1985 and was officially launched in September of that year, with PR from Aspect Public Relations. The journalist launch was the first promotional event held in the Cabinet War Rooms.

Despite plans for improved Liberator Mk1A and Mk2 variants, production of the Liberator ended in September 1986.

Description

The Liberator was based on a Zilog Z80A microprocessor and a Gate array implementing the screen controller, keyboard interface and other I/O logic. The LCD display had a resolution of 480 x 128 pixels, or 80 columns by 16 lines of text. Interfaces comprised two S5/8 serial ports and two expansion buses, one specifically for extra RAM. Two battery packs were available, a NiCad rechargeable pack giving 12 hours operation, or one holding four AA cells giving 16 hours. The Liberator had 40 kB of internal RAM as standard, plus an optional 24 kB which could be write-protected by means of an external switch and had its own button cell battery to provide non-volatile storage. Another 24 kB of non-volatile RAM could be plugged into the external RAM expansion bus.

The Liberator's custom wordprocessing software ran under the CP/M operating system.

The external dimensions of the Liberator were 295 x 252 x 35mm.

Related Research Articles

<span class="mw-page-title-main">Dragon 32/64</span> Home computer model

The Dragon 32 and Dragon 64 are home computers that were built in the 1980s. The Dragons are very similar to the TRS-80 Color Computer, and were produced for the European market by Dragon Data, Ltd., initially in Swansea, Wales, before moving to Port Talbot, Wales, and by Eurohard S.A. in Casar de Cáceres, Spain, and for the US market by Tano Corporation of New Orleans, Louisiana. The model numbers reflect the primary difference between the two machines, which have 32 and 64 kilobytes of RAM, respectively.

<span class="mw-page-title-main">Jupiter Ace</span> British home computer of the early 1980s

The Jupiter Ace by Jupiter Cantab was a British home computer released in 1982. The Ace differed from other microcomputers of the time in that its programming environment used Forth instead of the more popular BASIC. This difference, along with limited available software and poor character based graphic display, limited sales and the machine was not a success.

Psion Organiser was the brand name of a range of pocket computers developed by the British company Psion in the 1980s. The Organiser I and Organiser II had a characteristic hard plastic sliding cover protecting a 6×6 keypad instead of a computer keyboard, with letters arranged alphabetically.

A RAM drive is a block of random-access memory that a computer's software is treating as if the memory were a disk drive. RAM drives provide high-performance temporary storage for demanding tasks and protect non-volatile storage devices from wearing down, since RAM is not prone to wear from writing, unlike non-volatile flash memory.

<span class="mw-page-title-main">Cambridge Z88</span>

The Cambridge Z88 is a Z80-based notebook computer released in 1987 by Cambridge Computer, the company formed for this purpose by Clive Sinclair. It was approximately A4 paper sized and lightweight at 0.9 kg (2.0 lb), running on four AA batteries for 20 hours of use.

<span class="mw-page-title-main">Zenith MinisPort</span> Line of PC-compatible subnotebooks

The Zenith MinisPort is a subnotebook based on an 80C88 CMOS CPU running at two software selectable speeds: 4.77 MHz or 8 MHz. It was released in 1989 by Zenith Data Systems (ZDS).

<span class="mw-page-title-main">TRS-80 Model 100</span> Portable computer introduced in 1983

The TRS-80 Model 100 is a notebook-sized portable computer introduced in April 1983. It was the first commercially successful notebook computer, as well as one of the first notebook computers ever released. It features a keyboard and liquid-crystal display, in a battery-powered package roughly the size and shape of a notepad or large book. The 224-page, spiral-bound User Manual is nearly the same size as the computer itself.

The Acorn Communicator is a discontinued business computer developed by Acorn Computers. Mentioned in the computing press in late 1984 as the C30, previewed in early 1985 with estimated pricing between £500 and £800, in late 1985 with a built-in LCD display, and subsequently unveiled in a slightly different form, the system sold in very low numbers to companies requiring a computer with a built-in modem.

<span class="mw-page-title-main">Sleep mode</span> Low power mode for electronic devices

Sleep mode is a low power mode for electronic devices such as computers, televisions, and remote controlled devices. These modes save significantly on electrical consumption compared to leaving a device fully on and, upon resume, allow the user to avoid having to reissue instructions or to wait for a machine to boot. Many devices signify this power mode with a pulsed or red colored LED power light.

A system monitor is a hardware or software component used to monitor system resources and performance in a computer system.

HyperDrive (HD) is a series of RAM-based solid-state drives invented by Accelerated Logic B.V. employee Pascal Bancsi, who partnered with the British company HyperOs Systems, who manufactured the retail product. The HyperDrive interfaces with and is recognized by computer systems as a standard hard drive.

<span class="mw-page-title-main">NEC UltraLite</span> Line of notebook-sized laptops

The UltraLite is a line of notebook-sized laptops first released by NEC in 1988. The original model was released in October 1988, alongside the heavier and more-capable ProSpeed. The UltraLite was the first notebook computer on the market compatible with the IBM PC. The original model was based on the NEC V30 microprocessor; the computer includes MS-DOS 3.3 built into ROM.

<span class="mw-page-title-main">PowerBook 170</span> Laptop by Apple

The PowerBook 170 is a laptop computer that was released by Apple Inc. in 1991 along with the PowerBook 100 and the PowerBook 140. Identical in form factor to the 140, it was the high end of the original PowerBook line featuring a faster 25 MHz Motorola 68030 processor with 68882 floating point unit (FPU) and a more expensive and significantly better quality 9.8 in (250 mm) active matrix display. It was replaced by the PowerBook 180 in 1992.

<span class="mw-page-title-main">Toshiba T1200</span>

The Toshiba T1200 is a discontinued laptop that was manufactured by the Toshiba Corporation, first made in 1987. It is an upgraded version of the Toshiba T1100 Plus.

<span class="mw-page-title-main">OLPC XO</span> Laptop computer

The OLPC XO is a low cost laptop computer intended to be distributed to children in developing countries around the world, to provide them with access to knowledge, and opportunities to "explore, experiment and express themselves". The XO was developed by Nicholas Negroponte, a co-founder of MIT's Media Lab, and designed by Yves Behar's Fuseproject company. The laptop is manufactured by Quanta Computer and developed by One Laptop per Child (OLPC), a non-profit 501(c)(3) organization.

<span class="mw-page-title-main">Amiga 1200</span> 1992 personal computer

The Amiga 1200, or A1200, is a personal computer in the Amiga computer family released by Commodore International, aimed at the home computer market. It was launched on October 21, 1992, at a base price of £399 in the United Kingdom and $599 in the United States.

<span class="mw-page-title-main">Gdium</span>

The Gdium is a subnotebook / netbook computer produced by EMTEC. The Gdium product is distinguished by its unique Loongson MIPS processor and the use of a USB key as a primary storage device. The Gdium netbook is marketed as an interface device to the Gdium "learning community"—a website that provides hardware support, MIPS builds of open-source software, Linux computing tips, and educational resources targeted towards teachers and students within the K-12 demographic.

<span class="mw-page-title-main">Computer hardware</span> Physical components of a computer

Computer hardware includes the physical parts of a computer, such as the central processing unit (CPU), random access memory (RAM), motherboard, computer data storage, graphics card, sound card, and computer case. It includes external devices such as a monitor, mouse, keyboard, and speakers.

This glossary of computer hardware terms is a list of definitions of terms and concepts related to computer hardware, i.e. the physical and structural components of computers, architectural issues, and peripheral devices.

S5/8 was a serial communications standard devised in the United Kingdom in the 1980s as a simplified subset of RS-232 intended to make interoperability easier. Although published by the British Standards Institution as standard DD 153:1990, it was not widely adopted, and the BSI standard was later withdrawn.

References

  1. Photo:Dragoneers, ...Taken sometime in 1984 when part of the Dragon team had moved on to Thorn EMI to create the Liberator hand-held computer...Left to Right - Duncan Smeed (original Dragon ROM BIOS developer and head of software), Jan Wojna (worked on Dragon hardware), John Linney (worked on Dragon system software), John Peacock (finance), Derek Williams (Managing Director)...
  2. Retro Review: Thorn EMI Liberator (1985) TechTonic