• Yellow power LED
• Green hard drive access LED
• Keyboard lock
• 5.25 inch bay
• 4*3.5 inch bays
• On/Off switch

• AC power connector
• Monitor connector
• Parallel port 25D-F
• Serial port 25D-M
• External floppy drive 23D-M
• Keyboard 6 pin mini DIN
• Video 23D-F
• Left audio phono
• Right audio phono

• Joystick port
• Mouse port

• 32 MB Fast RAM - accessible by OS
• 2 MB Chip RAM - exclusively for custom chips
• 200 pin "local bus" CPU expansion slot
• Daughter board expansion slot
• Board mounted sockets for
• Parallel port
• Serial port
• External floppy
• Keyboard
• Video
• Left audio
• Right audio
• Joystick
• Mouse
• Keyed Power Supply socket
• Floppy controller socket
• IDE controller socket
• Custom chip - Fat Gary
• Custom chip - Ramsey
• Custom chip - Alice
• Custom chip - Lisa
• Custom chip - Super Buster
• Custom chip - Brigette

• 4 of 100 pin general purpose Zorro III expansion slots.
  Backwardly compatible with Zorro II devices.
• 3 of PC/AT expansion slots.
• 1 of Video expansion slot.

The PC/AT and Video slots line up with the Zorro III such that a bridge board or a specialised video card can use two inline slots.

With this innovative design a number of different processors could occupy the same Amiga superstructure.

Initially shipped with the 68040 25 MHz chip later versions came with the 68040EC and the 68030 chips.

Ambitiously it was hoped a DSP expansion card would be made - of which I have heard nothing.

The very early keyboards came with standard size functions keys but this was later changed to the chunkier Ones.

The major difference is the 2 chunky 'Delete' and 'Help' keys above the cursor 'T'. These are very easy to spot in any TV/Film programme normally in conjunction with the [Philips 88XX] series of monitors.

Note the function keys are in groups of 5 not 4 a la Wintel

Nothing out of the ordinary apart form the fact is was lower and hence wrist aching than the Wintel equivalent.

Most of the Amiga crowd where sane and used high mobility alternatives [trackballs] - light pens or graphics tablets.

This converted the A4000 video output via a 23D type into the standard VGA D type.

Ironically the official monitor for the A4000 - the 1960 had a VGA connection.

Special monitors such as multi-synchs were needed as the normal Wintel monitors did not have the range of horizontal/vertical scanning frequencies required for the Amiga superior graphics modes.

How To Build Up an A4000

• Start with the bare box and power supply.
• Add mylar insulating plate for underneath of PCBA.
• Add A4000 PCBA attaches at 2 external hex 'D' locator socket-screws to the rear expansion socket and 9 screws to the bottom of the case.
• Add power lead to PCBA (keyed)
• Add A3640 board that locates on 4 plastic height spacers and CPU expansion slot
• Add front panel and three twisted pairs each end in a 3 plug. The empty plug hole faces out - The black wire faces in

Plug pin 1	Plug pin 2	Plug pin 3	Plug Colour	Connects to
Black	White	None	White	Disk green LED
Black	Red	None	White	Power yellow LED
Black	Red	None	Black	Keylock keylock socket

• Add floppy drive - it slides in under a tongue and secures with 2 screws at the front.
• Add floppy power lead (keyed) and Ribbon cable pin 1 outwards on floppy end. Note Pin 1 on A4000 BC
• Add A4000 daughter board into Daughter board expansion slot
• Add case strengthener/daughter board which fasteners with 2 screws.
• Add hard drive connects with 4 screws onto power supply and case strengthener
• Connect hard drive power and IDE lead pin 1 inner on drive side. Note Pin 1 on A4000 BC
• Case fastens with 2 screws