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The Xi (the name derives from the Roman numeral for 10 - The capacity of the hard disk) is the computer that established Apricot as a major player.  The Xi was the hard-disk equipped version of the Apricot PC, which elevated it to a whole new level of value.

The Xi had charcoal coloured case plastics that stood out among the beige products of its competitors.  A 20Mb version was also manufactured (in much smaller numbers) in a grey plastic.

The PC Xi was shipped with MS-DOS 2 as standard, and with a graphical 'Manager' application that could be configured to act an an application menu.  A very primitive pre-cursor to the GUI's such as Windows and GEM that would soon appear.

There was an upgrade option for he Xi called the PC286 which replaced the motherboard with an 80286-based product.  This is incredibly rare.  I've never actually seen one.

CPU

Intel 8086 @ 4.77MHz

RAM

256Kb (Expandable to 768Kb via expansion cards)

Graphics

700x400 (80x25 text)

Storage

Single Sony 3.5" floppy disk with 315Kb or 720Kb capacity

10Mb Rodime RO352 Hard Disk

Internal Expansion

Optional 8087 Maths Co-processor

Optional 8089 IO Processor

2 x proprietary expansion slots (one used by HD Controller)

External Ports

Parallel printer port - Centronics

RS-232 serial port - DB-25

Apricot Monitor connector - proprietary design

Apricot Keyboard connector- proprietary design

Mouse port (on keyboard)

Expansion Cards

128Kb RAM expansion

256Kb RAM expansion

512Kb RAM expansion

Internal modem

16 colour display card (very rare)

Network Interface Card (10BASE-T Ethernet or Corvus Omninet)

Physical

Main unit dimensions: 42cm x 32cm x 10cm

Main unit weight: 6.4 Kg

Xi5

256Kb RAM, 5Mb Hard Disk, 315Kb single-sided floppy drive

Xi10

256Kb RAM, 10Mb Hard Disk, 720Kb double-sided floppy drive

Xi20

512Kb RAM, 20Mb Hard Disk, 720Kb double-sided floppy drive

Xi20s

1Mb Ram, 20Mb Hard Disk, 720Kb double-sided floppy drive