DISCONTINUED - This product is no longer manufactured



This product has been replaced by a newer version, we recommend the latest version of this product for new projects - see ADDERView 4 PRO DVI

Continued support on this product is still available to our existing customers, please contact our Support Team or your local Adder Office for more information.

The ADDERView GEM is the ultimate in desktop KVM convenience and allows up to four computers to be controlled from a single keyboard, monitor and mouse. The GEM is ideal for SOHO (small office, home office) workers, hardware and software developers, test technicians, network managers, support desks or any environment where the need to control multiple computers from a single keyboard, monitor or mouse is required. All connections are made at the rear and with ADDER's own high specification VKVM cables, your whole installation can be completed within minutes. 

The GEM is extremely compact and takes up very little space on your busy desktop or in a crowded server room. Available in either two or four channel models GEM is designed for ease of use and maximum compatibility with new and existing computer systems. Often low-cost is associated with low-specification, but not in the case of the GEM. Like all ADDER switches GEM features SmartBoot, which intelligently allows all connected portable or desktop computers to boot as if they had their own dedicated keyboards and mice attached. It also supports PC/AT and PS/2 systems and provides high video bandwidth with low distortion at screen resolutions up to 1900 x 1440. This makes the GEM the ideal choice for use with larger monitors in CAD or DTP environments. The latest monitors equipped with DDC interfaces are also supported and this facilitates true "Plug-and-Play" compatibility.

The GEM offers the user many choices for channel selection. Keyboard hot-key, mouse switching, front panel operation, RS232 and optional RC1 remote control switching are all provided as standard and access to connected computers can also be restricted using the GEMs security password protection feature. 

Product codes

Product Features

A choice of compact two and four port models 

Reliable interface powered operation 

SmartBoot allows simultaneous bootup of all computers 

Standard colour coded connectors used to PC99 specification 

Channel selection via hot-key, mouse, front panel key or RS232 

Password protection prevents unauthorised access 

Cascadeable to support more than 4 PCs 

Supports Windows 3.X, 95, 98, NT4, 2000, DOS, UNIX, OS/2 and other common operating systems 

Hardware compatible with desktop and laptop PCs, RS6000, SGI and DEC Alphas 

Flash upgradeable for future enhancements 

Supports optional remote control module RC1 

High video quality supporting DDC monitors and screen resolutions of up to 1900 x 1440 Remote control RC1 Windows 3.X 95 98 NT 2000 ME Netware DOS OS2 PC RS6000 SGI Alpha UNIX Linux 


AVG4: 1 shared keyboard, monitor and mouse to 4 CPUs


AVG 4:

4 x 15 way HD D Female for CPU video (DDC/Blue)
4 x 6 way mini DIN Female for CPU keyboard (Violet)
4 x 6 way mini DIN Female for CPU mouse (Green)
1 x 6 way mini DIN Female for shared keyboard (Violet)
1 x 6 way mini DIN Female for shared mouse (Green)
1 x 15 way HD D Female for shared monitor (DDC/Blue)
1 x 15 way standard D Female for FLASH upgrade and RC1 remote, RS232 control and synchronisation
1 x 5V dc power inlet for optional 500mA external PSU
1 x Option switch (underside) 

CPU video/monitor ports

A monitor can be plugged straight into the monitor port. Supports VGA/SVGA/XGA/XGA-2/SXGA/UXGA video.
VESA DDC1 and DDC2 signalling supported. Screen resolution of up to 1900 x 1440. Screensaver feature support.  

Keyboard ports

Supports AT and PS/2 keyboards automatically. PS/2 keyboards plug in directly and keyboards with AT style 5 pin DIN plugs require an adaptor. Automatic mode emulation ensures that the keyboard is correctly programmed to the state expected by the CPU whenever the channel is changed.Type 1, 2 and 3 keyboards are supported. 

Mouse ports

A PS/2 type Logitech or Microsoft compatible mouse is required to control the switch. Use of a 3 button mouse also allows channel switching. Many Internet wheel/scroll mice including Scrollpoint and Explorer are also supported. Prompt and stream modes supported for maximum portable and desktop mouse compatibility. All mouse connections from the GEM to PCs support both serial RS232 and PS/2 mice in any combination. 

Maximum distance

2m if interface-powered or 10m if PSU used when attached keyboard, monitor and mouse.
5m if interface-powered or 30m if PSU used when attached to CPU or cascaded GEM. 

Front panel key and display

Used for selecting channels and entering configuration mode. Display shows selected CPU, data activity from keyboard or mouse and switch status.


Adjustable to display only active ports or all ports in sequence. 

Multiple video head operation

Multiple GEMS may be linked together via the options ports to provide synchronised switching for multiple videohead applications. 


User-selectable to prevent unauthorised access to connected CPUs.The password is safely stored in the unit's EEPROM memory.


User Flash upgradeable firmware by downloading from a PC's serial port. 


Metal case 230 x 50 x 170 mm with plastic front display panel.


Interface powered operation. Optional 5Vdc, 500mA PSU available.


Complies with European EMC directive 89/336/EEC. CE marked and FCC class A compliant.

Order code

AVG4: Single keyboard, monitor and mouse to 4 computers.


RC1: Optional remote control unit
PSU/5VDC: Optional power supply
VKVM2: 2m "3-in-1" cable for PS/2
VKVM5: 5m "3-in-1" cable for PS/2
VKVM10: 10m "3-in-1" cable for PS/2

VKVM2-AT VKVM2 with adaptors AT PCs
VKVM2-AT VKVM2 with adaptors AT PCs
VKVM2-AT VKVM2 with adaptors AT PCs 

Associated products

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Where to buy

Adder products are purchasable through our key technology partners. You can find a partners on our where to buy page.

Where to buy


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