The system unit contains: the processor(s), the system memory, disk drives, power
supply, security circuitry and interfaces to keyboard, monitor and peripherals. All the
interface circuitry except the Token-Ring network interface is on the system board.
Dedicated connectors are provided on the system board for a Token-Ring module.
A block diagram of the system unit is shown at the end of this section. It shows the
components of the system and identifies functions implemented on the system board.
The keyboard is a full QWERTY typewriter keyboard and numeric keypad together
with editing keys. The layout of the 102 key UK keyboard is compatible with the IBM
AT enhanced keyboard.
The keyboard is fitted with a PS/2 style miniature DIN connector and any fully
compatible keyboard can be plugged into the system unit.
The system board is fitted, with a VGA video interface which will drive any suitable
monochrome or colour analogue monitor.
The on-board VGA controller also supports high resolution video modes. To take
advantage of the higher resolution video modes an SVGA or EVGA monitor must be
used. Video drivers for popular software packages are available.
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