Some of our latest additions are shown below - clicking on the link will take you to the items main page and will also show any further photographs.
An expansion box that allows you to keep up to nine ROMs installed and switch between them instantly.
Slomo gadget for the BBC Micro from Nidd Valley Products Ltd.
Slowmo provides the computer user with infinitely variable control over the speed of program execution. Nearly all software can be controlled from normal speed down to virtual standstill, or can be instantly frozen at any point.
The unit plugs directly into the computer Tube port. Power is taken from the host computer and no operational software is required.
The right hand push switch activates slow motion; a red LED indicates 'on' and speed is set by the centre dial. The left hand switch operates instant freeze frame whilst pressed, and returns to the previously set speed when released.
Two joystick controllers for use with the TRS-80 color computer. In their original box.
Catalogue number 26-3008 for use with computers 26-3002, 26-3003, and 26-3004.
The abbreviation MC-24 is a series of electric calculating machines, automatic, with integrated print and register memory, produced by the Italian Olivetti , starting from 1956 . The mechanism was designed by Christmas Capellaro , while the body is due to Marcello Nizzoli . The most popular model and sold (they were produced 6 million units),
the Divisumma 24 as well as a revolution in the field of automatic
computers has also become an icon of industrial design Italian  , is part of the permanent collection of the Triennale Design Museum of Milan  , as well as being preserved in many museums dedicated to the design and science and technology and typewriters. The Divisumma 24 is also part of the permanent collection of the MoMA in New York 
The series consisted of three basic models: the Multisumma-24 (addition, subtraction and multiplication), the Divisumma-24 (also split) and Tetractys that, equipped with a dual totalizer and a number of additional features, represented the worldwide state of the art of mechanical calculation of those years. Were then made several special models, such as variants CR, equipped with trolleys tab for accounting needs. Among these there is also a "Elettrosumma 24 CR" no automatic multiplication.
The production of this class of machines, factories located in the ICO via Jervis , to Ivrea , continued until the '70s. The special versions, (MC24-CR), were initially produced in factories OMO, located in the village of San Bernardo Ivrea and subsequently translocated in the plants in Via Jervis, the assembly was piece-work individually, with average volumes of production of 50 units per day.
The most innovative aspect of these machines is the fact that the two
top models were the first to have a calculator how to use almost
completely analogous to that of the existing calculators: ability to
perform the four operations, a single numeric keypad reduced (10 key) to
set all the terms of the transaction and print the results.
This is an SMPTE LTC reader podule for the Acorn Risc PC and the Archimedes A5000 machines.
The PRES A3K6 Disc Buffer is a disc interface expansion card for the Acorn Archimedes A3000 computer.
From the user manual:
" The PRES Disc Interface Card allows you to connect up to three additional 2.5 or 5.35 inch drives to an A3000. The software provided allows you to control the mapping between the drive numbers and the actual drives (which may be altered freely) and the double-stopping feature."
This one does not come with the software.
The Eesox Audio Mixer mixes audio from a CDROM drive with computer generated sound. It is capable of dirving various audio output devices such as:
- Internal Speaker
- Active Speakers
- Audio Amplifier / Hi Fi System
This unit is designed for the Acorn Risc PC 600 only as the 700 and StrongARM Risc PCs already have such a device.
The Acorn Archimedes A5000 computer shipped with either 1MB or 2MB of RAM.
This RAM module upgrades the 1MB version to 2MB of RAM and also the 2MB machine could increase to 4MB, with an additional 'daughterboard'.
The Watford Electronics Co Pro Adaptor allows Master style co-processors to be used with the BBC Micro B and B+.
The Acorn AGA31 386 PC card is a mini expansion card, or 'MiniPodule', for the A3020 and A4000 series of Archimedes computers. It allows a RISC OS machine to run DOS applications.
The label on the card says "Acorn. Designed and manufactured by Aleph Ltd on behalf of Acorn Computers".
This unit appears to be in its original packaging and contain all its manuals and user guides.
The Acorn System 3 is a disc-based computer in a card frame. The minimum specification for this system is as follows:
- 1MHz 6502 CPU
- VDU interface
- 8K RAM with 4K BASIC ROM
- Floppy disc controller
- 100K 5.¼" disc drive mounted in the card frame.
Our one was kindly donated by Chris Whytehead and has:
- 80 x 25 character VDU card
- 3 x Acorn Memory cards
- Acorn 6809 CPU card
- Custom RS232 serial card (can drive a PC comms port via a null modem cable)
- Acorn floppy disc controller card
- 2 x Tandon 40 track SS SD floppy disc drives (1 in card rack, the second external)
As well as a standard System Keyboard (pictured).
The Romex 13 is a sideways ROM Extension board for the BBC Micro. It provides and additional 12 ROM sockets and is attached to the top of the BBC Micro using pads. It is then connected to the motherboard using the ribbon cables provided.
The Olivetti Prodest PC 128S is an Italian version of the Acorn BBC Master Compact that was sold exclusively in Italy.
Olivetti simply changed the colouring of the case and translated the manual and 'Acorn Welcome Disk' programs into Italian.
Information on the original BBC Master Compact can be found HERE.
Our one was kindly donated by Chris Whytehead.
Magnetic tape data recorder.
- Built-in fast-forward/rewind switch.
- Speaker monitor at loading and saving.
- 2-way LED indicator.
- Phase shift switch.
- Mode switch (normal/data).
- Tape counter.
A clip-on accessory for the Nintendo Game Boy. Provides screen magnification and lighting; twin stereo speakers; and enlarged joystick/fire buttons.
This interface board allows for an Amstrad FX9600T or FX9600AT fax machine to be connected to an Acorn Archimedes computer. The device plugs into the Econet interface and a cable links the Archimedes to the fax machine.
Our one comes with the required cable and the FaxScan software.
From the Operating Manual:
"The Watford Electronics Video Digitiser is a very versatile add-on for the Acorn Archimedes range of computers.
Facilities are provided for grabbing images which can be displayed, rotated and/or scaled to any size and angle, saved to disk for future use, or printed out. It is also possible to grab sequences of pictures making up an animated sequence, and to obtain colour digitised images when using a video camera as the source."
This one has the Operating Manual, User Guide and Utilities Disc.
A third party podule for the Risc PC / A7000 / Iyonix / A9Home.
It has a standard audio jack input on the side as well as a MIC/LINE switch and MIDI IN/THROUGH/OUT sockets.
The Aries B12, by Cambridge Computer Consultants Ltd, is a sideways ROM expansion for the BBC Micro Model B.
It has 12 sockets for sideways ROMs (marked 1 to 12) and two sockets for sideways RAM (marked 0L and 0H).
A speech system upgrade for the BBC Micro. This Speech System uses the BBC Micro's sound generator, audio amplifier and speaker to speak words.
It contains a speech processor and a chip called a 'Phrase Read Only Memory (PHROM) which has 165 ready made word and word parts stored in it.
Our one includes the upgrade instructions for the BBC Micro and the User Guide.
The Educational Software Company's 'paintbrush' colour light pen for the BBC Micro Model B known as 'The Robin'.
This one comes in its orignal cassette box.
The ABC 210 (later Acorn Cambridge Workstation) was one of eight in a series of computers known as the 'Acorn Business Computer' (ABC) series. These machines were aimed at the business, research and futher education markets. However the ABC range was cancelled before any of the models were shipped to customers.
Subsequently, the ABC 210 was relauched as the 'Acorn Cambridge Workstation' and was indeed sold, albeit in modest numbers, to academic and scientific users.
The Acorn Cambridge Workstation (ACW 443) has the following specification:
4096Kb RAM memory.
6MHz RAM bus.
20 Megabyte hard disk. (The 210 had a 10 Megabyte hard disk)
32016 processor. (6502 acting as I/O processor)
32016 firmware (Pandora) in ROM. The ABC 210 was intended to run Xenix, however, the ACW was shipped with Panos.
Our one was kindly donated by Chris Whytehead.
This SCSI interface will function with any Acorn computer that supports a standard podule and will support DMA on the RISC PC and the A7000 series machines.
Kortink ReCo6502 is a remake, using modern parts, of the Acorn 6502 Second Processor, which was introduced in 1984 for the BBC Micro, and was created by John Kortink.
It offers several major enhancements. Most notably, support for faster 65C02s (up to 14 MHz instead of 3), support for the 65C816 (an enhanced version of the 65C02), and more memory (512 KB instead of 64).
Other enhancements include : more room for boot code (32 KB instead of 4), runtime selectable clock speed, on-board Hi-BASIC, and roughly halved power consumption.
ReCo6502 is not a standalone product. An existing Acorn 6502 Second Processor is required. ReCo6502 replaces its PCB, and 'inherits' its Tube ULA.
Naksha handheld scanner for Atari 520, 1040 ST, STFM, STE STF computer hardware.
Contains software, power supply, cartridge and Naksha branded box.
The Advanced Technology Products Ltd Sidewise+ board was developed to provide ROM expansion for the BBC Micro B+. It contains a total of ten, 16K ROM sockets and is of a 'plug in and go' construction.
This one has a couple of bent connectors on the base.
20K RAM expansion for the BBC Micro
Model B, made by Cambridge Computer Consultants Ltd. It consists of a board with ten 2K RAM chips and a ROM.
This kit contains the hardware parts necessary to upgrade any BBC Micro to include an Econet Interface.
This one includes the user guides but may be missing components.
The Aries-B32 is a single plug-in board for the BBC Micro, produced by Watford Electronics, giving an extra 32K of RAM plus a 16K sideways ROM socket.
The extra 32K of RAM can be configured in a variety of ways, using commands from the keyboard or within programs.
Our one has a DIL header that is fully intact and contains the user manual.
This 'Interpod' is a Serial and Parallel Interface, designed and manufactured by Oxford Computer Systems for use with systems such as the Commodore 64 and VIC-20.
Information from the base of this item:
Podule Type 1
Podule No 1254
Our unit comes with the PSU.
The Eureka 64K Board is an add-on for the BBC model B computer which provides extra memory for programs and data. With Eureka fitted the computer will behave exactly like a normal machine for almost all commands, the only difference is that approximately 58K of memory will be available! You can use any screen mode without affecting the available memory and programs will run at exactly the same speed as normal. The principle of operation is described in the Hardware section and is the subject of a British Patent Application.
Our board is Issue 2, complete with EPROM.
These paddles connect to any Atari console. The are in their original box.
"The Stack Light Rifle is one of a range of accessories and software for Atari, BBC, VIC-20, Commodore 64, Spectrum, and other popular home computers."
Competition Pro produced joypads for several systems, all of which improved on the stock joypads in various ways. This joypad includes selectable turbo and auto fire modes, and was popular with CD32 owners due to the improved quality of the directional pad compared to the standard CD32 joypad.
"Getting started with the eyemodule2 is as simple as sliding it into your Springboard expansion slot, pointing the lens at the subject, and pressing the capture button - that's it! no batteries required, no software to load on the Visor handheld. Perfect for pictures at a moment's notice: a whiteboard at the end of a meeting, a dream house that just came on the market, a sign in Japanese (so you'll remember it next time), new faces at work, driends at a party, a snapshot of where you parked the car, nieces and nephews, or construction in progress. Capturing Mini-Movies and time lapse events adds to the fun."
Our camera module is in it's original box.
This Sinclair-branded RAM module adds 1-3K RAM to a ZX80 computer.
Issues in this box:
6) July 1984
7) August 1984
8) September 1984
12) Christmas 1984
13) February 1985
14) March 1985
15) April 1985
17) June 1985
18) July 1985
21) October 1985
22) November 1985
23) December 1985
24) Christmas 1985
Issues in this box:
- Full size piano type keys
- Five octave (61 notes) plugin-in keyboard
- Compatible with all included software
Sound Expander (FM Sound Module)
- Adds high-tech sound to the Commodore 64 using the latest FM technology
- Play up to eight notes at once plus rhythms, one finger chords and auto accompaniment
- Notes are displayed on a music stave on screen as you play them
- Incredibly realistic voices including vibraphone, brass, strings, synth sounds and many more
- Programmable synthesizer
- Home recording Studio
- Create sounds using on screen controls like a conventional synthesizer to alter wave forms etc.
- Build up recordings one track at a time and play back as a complete composition
- Midi compatible
Our keyboard is complete in original box.
The Thorn EMI Liberator was produced in 1985 for the UK Civil Service. It can claim to be the first mass-produced British laptop.
The Liberator started in 1983 when the UK Government#s Central Computer and Telecommunications Agency required a portable device to allow civil servents to produce and edit documents without the need for dedicated typists. Dragon Data were contacted to develop the product but went into administration shortly after. Thorn EMI took over the project in 1984. Production ended in 1986.
The Liberator had a Zilog Z80 processor and an LCD display with 480x128 pixels (equivalent to 80x16 characters). It came with 40KB internal RAM as standard, with an optional 24KB available as an option. The RAM was battery-backed to enable non-volatile storage. An expansion port allowed a further 24KB of RAM to be added.
The system ran CP/M from ROM with custom word processing software.
A prototype Sinclair QL. Used for R&D by Sinclair prior to the QL's general release. Comes in it's own carrying case.
Kindly donated by Paul Hughes.
Early model one ZX Spectrum's were manufactured with light-grey keys instead of the blue-grey used in later models. Only around 60,000 model ones were produced; ours has serial number 001-007045.
The Watford Electronics 32K RAM Extension Board doubles the RAm capacity of the standard BBC Micro and is designed to fit in with other Watford Electronics products such as the Double Density Disc System and ROM Expansion System.
It allows programs of up to 28K to run in any screen mode. It also provides as 12K buffer, allowing two jobs to be performed at the same time, e.g. typing a document while another one is printing. The buffer can also use the full 32K of the RAM board, and can replace any of the buffers in the BBC Micro such as printer, RS423, or speech.
This board is boxed and is compelte with manual, EPROM, and standoffs.
The Beaver Sensing Card is a simple analogue interface that connects to a BBC Microcomputer or to the Archimedes range of computers. The board is designed to be used with the Sensing Science Package which includes PriSM software. Connection to a BBC Microcomputer is via the analogue port.
The board has four analogue inputs via 3.5mm jack sockets and two digital inputs through quick connectors.
The Sensing Science Package software is archived in box SW35.
This unit allows you to connect your BBC Micro to a standard IEEE 488 bus.
The Xplorer FX Professional cheat cartridge allows you to modify how Playstation games behave. It comes preloaded with over 2000 cheats enabling extra characters, infinite lives, unlimited weapons, etc. You can also enter your own cheat codes. The cartridge is PC X-Link compatible and can be upgraded with proprietary Xpansion CDs.
The Xplorer FX Professional originally retained for £44.99
This interface board plugs into the Acorn Electron and provides a printer port and a user port. The Electron port is extended to the back of the unit, allowing additional cards to be attached.
The Nintendo 64 Expansion Pak provides an extra 4MB of memory for the N64 console, increasing the total RAM to 8MB. Many games could take advantage of the extra memory to provide increased graphics resolution, framerate, or additional gameplay options. Only a few games required the Expansion Pak to function (Donkey Kong 64; The legend of Zeld: Majora's mask; and Perfect Dark). The RAm in the Pak ran at a slower speed than the console's main memory.
Our Expansion Pak is in it's original box with the manual.
Join us for an exclusive late night opening on Friday 16 May, as part of Museums at Night. We'll be opening our gallery spaces between 6.00pm - 9.00pm and there will be two very special pre-booked tours running during the evening.
In these Computers 24/7 Tours, curator, Jason Fitzpatrick, will reference machines in the Centre's unique collection to explore the nocturnal activities of computers across the world.
There will be a wide range of working vintage computers available for closer viewing on the night, including the SGI Origin, the Ferranti Argus 100 and the unique NeXT Cube (the same type of computer that Tim Berners Lee used to develop the WWW).
In addition, visitors will be able to get a feel for what it was like to use many much loved machines from the past like the ZX Spectrum, Commodore 64 and the BBC Micro.
Places on the tours are strictly limited and must be pre-booked. Tours will run at 6.00pm and 7.30pm.
Photograph: Terry Harris / Centre for Computing History
Very kindly donated by Chris Jordan.
Intended primarily for training and educational use, including college-level courses and industrial in-plant training, the MC68000 Educational Computer Board (ECB) serves as an economical yet comprehensive introduction to systems based on the M68000 family of microcomputer products. Localted on a single small printed circuit card, a complete microprocessor system is provided, including an MC68000 16-bit microprocessor, memeory, parallel input/output, and serial communications I/O. The user must connect only an RS232C-compatible "dumb" terminal and power supplies to have a functional system.
For ease-of-use, the ECB has a resident firmware package that provides a self-contained programming and operating environment. The firmware, aptly names "TUTOR", provides the user with monitor/debug, assembly/disassembly, program entry, and I/O control functions. Utilizing the capabilities provided by the system, the user can investigate and learn the computing power and architectural feature of the MC68000. This system also provides a working example of the microprocessor external bus structure and interface to memory and peripheral devices.
The Educational Computer Board's features include:
- 4-megahertz MC68000 16-bit MPU.
- 32K bytes of dynamic RAM arranges as 16Kx16.
- 16K-byte firmware ROM/EPROM monitor addressed as 8Kx16.
- Two serial communication ports provided for a terminal and a host. Both are RS232C compatible and have selectable baud rates.
- Programs can be downloaded from a host system.
- A parallel port (16 data lines with handshake) can be used for I/O or for a Centronics-compatible printer interfaces.
- Audio cassette serial I/O port.
- Self-contained operating firmware that provides monitor, debug, and disassembly/assembly functions.
- 24-bit programmable timer.
- Wire-wrap area provided for custom circuitry.
- RESET and ABORT function switches.
Our ECB comes with full manual, datasheets, and marketing material.
Anderson Jacobson was primarily a manufacturer of acoustic coupler modems, but also manufactured printing terminals designed to replace teletypes. Anderson Jacobson began early in 1967 as a manufacturer of one of the first acoustic data couplers. By 1973, the company had acoustic coupler products that transmitted at 150, 300, 450 and 1200 baud. The 1200 baud acoustic coupler believed to be the only one of it's kind in 1973An acoustic coupler is an interface device for coupling electrical signals by acoustical means — usually into and out of a telephone instrument.
The link is achieved through converting electric signals from the phone line to sound and reconvert sound to electric signals needed for the end terminal, such as a teletypewriter, and back, rather than through direct electrical connection.
It is designed for acoustically coupling a telephone to a data terminal for the purpose of transmitting or receiving messages, where the telephone handset is placed on a bracket mounted directly on the chassis of the terminal. Isolation of transmitting and receiving acoustic links is provided by a pair of resilient cups, one for each link. The inside contour of each cup is adapted to provide a supporting annular ledge for one end of the telephone and an airtight seal over the transducer thereof. An annular recess below the ledge is formed to receive and tightly hold a flange of a receiving or transmitting transducer. Each cup is mounted on the bracket by a resilient flange. The flange is connected to the cup by a sleeve which is turned in at the top to form an inverted auxiliary cup with the base of the main cup protruding through the bottom of the auxiliary cup. In that manner, virtually complete acoustic isolation is provided by the cup from the surrounding air and bracket.
Our coupler has a serial number of 10259 and was kindly donated by William (Bob) H Williams
The PowerBook G4, the last professional Apple notebook series to use the PowerPC processor, features ultrathin titanium or aluminum case designs.
The PowerBook G4/1.5 15" (Sudden Motion Sensor/Bluetooth 2.0+EDR) features a 1.5 GHz PowerPC 7447a (G4) processor with the AltiVec "Velocity Engine" vector processing unit and 512k on chip level 2 cache, 512 MB of PC2700 DDR SDRAM, an 80 GB Ultra ATA/100 hard drive (5400 RPM), a slot-loading 8X DVDCD-RW "Combo" drive, a Firewire "400" and "800" port, built-in Bluetooth 2.0+EDR and AirPort Extreme (802.11g), and ATI Mobility Radeon 9700 (4X AGP) graphics with 64 MB of DDR SDRAM in an attractive aluminum alloy case with a 15" widescreen TFT display (1280x854 native resolution). Custom configurations also were available.
The PowerBook G4/1.5 15" (Sudden Motion Sensor/Bluetooth 2.0+EDR) is quite similar to the PowerBook G4/1.5 15" that came before it, but is equipped with a brighter "ambient light sensor" keyboard, a faster hard drive complete with "Sudden Motion Sensor" technology that stops the hard drive heads from moving if the notebook is dropped, a new "Scrolling Trackpad" that allows one to scroll or pan by touching the trackpad with two fingers instead of one, and Bluetooth 2.0+EDR.
The only difference between this model and the higher-end PowerBook G4/1.67 15" released at the same time is that this model has a slower processor and a "Combo" drive.
The VME/VSB TP30V board from Tadpole Technology of Cambridge, England used the 68030 as the central processor, following on from its range of VME 68020 boards. According to Tadpole, the new board maximises performance advantages from the chip, which includes an on-board subset of the MC68851 paged memory management unit co-processor and a separate 256-byte instruction and data cache, by using proprietary memory control circuitry (dubbed Accelerated Memory Access) to allow access at near cache speed to all 8Mb of dynamic randon access memory. The board also has two RS232 ports, battery backed real-time clock, and 2Kb of fast static RAM
Our board together with an an anti-static carrying box was very kindly donated by Julian Sinton
The Beehive B100 terminal was introduced in June, 1976 for $1,495.
The design of the B100 was similar to the Lear Siegler ADM-3A and was created by engineers who left LSI to form Soroc Technology
Introduced July, 1976
Introductory Price $1,495
20 mA current loop
Baud Rates 75, 110, 150, 300, 600, 1000, 1200, 1800, 2000, 2400, 3600, 4800, 7200, 9600, 19200
Refresh Rates 60 Hz, 50 Hz
Resolutions 80x24, 80x12
CPU Discrete Logic
Code Chart Beehive B100
Our Beehive terminal with a serial number of B22276 was kindly donated Julian Sinton
The iBook is a line of laptop computers sold by Apple Computer from 1999 to 2006. The line targeted entry level, consumer and education markets, with lower specifications and prices than the PowerBook, Apple's higher-end line of laptop computers.
Three distinct designs of the iBook were introduced during its lifetime. The first, known as the "Clamshell", was influenced by the design of Apple's popular iMac line at the time. It was a significant departure from previous portable computer designs due to its shape, bright colors, incorporation of a handle into the casing, lack of a hinged cover over the external ports, and built-in wireless networking. Two years later, the second generation abandoned the original form factor in favor of a more conventional, rectangular design. In October 2003, a third iteration was released that added a PowerPC G4 chip and a slot-loading drive.
Apple replaced the iBook line with the MacBook in May 2006 during Apple’s transition to Intel processors. The MacBook has also evolved into different models, such as the MacBook Pro targeting high performance and the MacBook Air targeting the entry level, consumer ultrabook-market.
by CBR Staff Writer| 08 November 1989
"Dolch Computer Systems Inc, San Jose, California expects to be the first to market with an 80486-based luggable computer: the new Dolch PAC 486-25 weighs just under 20 lbs, comes with three AT slots, and sells for $13,000 with 100Mb hard disk and 640 by 400 CGA-compatible electroluminescent screen - and another $600 buys a VGA-compatible 16-shade gas-plasma display; the thing is planned for end-November.
a desktop replacement for even the most demanding power user.
Features: 25-Mhz 486 CPU
100MB hard disk
5.25-inch floppy disk drive.
Weight: 20 pounds.
List price: $12,995"
Dolch Pac 486 Intel 486DX cpu running at 100mhz. Runs Win95. Color VGA screen
Serial number DCS 2017673
Electric, 12/13 digits, Sterling currency (with Farthings)
Dimensions: 230W x 370D x 180H
The Elettrosumma 22 is a large, heavy-duty add-list machine from the 1950s and 60s. It has 12 places in the keyboard and 13 in the result mechanism. The printing mechanism has another four hand-settable print wheels to the left of the numeric columns. It accommodates paper up to 100mm wide.
This Sterling-currency version has five additional pence keys (1/4, 1/2, 3/4, 10, and 11) located just above the main keypad.
It was introduced in mid-1958, claiming "With a speed of 210 cycles per minute the Elettrosumma 22 is the fastest adding/listing machine yet produced." It was priced at £89 15s Sterling [about US$250].
This was sold in kit form and built from a
motherboard and chips and sourced half of them from the US. 2K BIOS, 2K
BASIC and you load your programs via tape cassette and run it to a TV
THE TRANSAM TRITON COMPUTER Specification
8080A BASED SYSTEM
BOARD HOLDS UP TO 4K ROM
POWERFUL 1K MONITOR IN ROM
POWERFUL 2K TINY BASIC IN ROM
UP TO 3K USER RAM ON BOARD
64 GRAPHIC CHARACTERS
AUDIO (STANDARD TTL) OUTPUTS
COMPLETE POWER SUPPLY
1KVDU RAM ON BOARD
This computer and documentation was assembled and donated by John Young
This is a L.C.D. breakout box by RS Components Ltd. It comes in its own black case, with the original instructions
Stock number 635-375
Line powered LCD type with 16 monitored lines, patchable positive and negative monitors and the pulse trap.
Together with a soft case this was kindly donated by John Young