Commodore Amiga A4000 User Manual page 23

Upgrading the Kickstart and W orkbench
The Am iga A1200 can be upgraded to latest Kickstart and W orkbench as follows:
From
W orkbench 3.0
W orkbench 3.0 or 3.1
In m ost cases a new Kickstart ROM Chip set needs to be installed.
You can also replace the old OCS chips with ECS (Enhanced Chip Set) but you cannot install AGA
Chip Set.
Instructions
Rem oving the Cover: (see The C= Am iga A4000 User's Guide)
1. Use a Phillips-head screwdriver to rem ove the two screws at the upper corners
of the rear of the m ain unit.
2. Grasp the cover on both sides and slide it backwards and up.
Rem oving the front bay: (see The C= Am iga A4000 User's Guide)
1. Disconnect the keylock and the LED assem bly wiring from the m otherboard.
2. Rem ove the front faceplate. The faceplate has several plastic tabs that hold
it to the m etal chassis. Squeezing the tabs and pushing them through the chassis
holes will release the faceplate. You m ay need a sm all pair of pliers to do this.
3. Disconnect the power and ribbon cables from the existing drive(s) in the front
area.
CAUTION: Note the orientation of the connectors before you rem ove them so that
you can replace them properly when you are done.
Rem oving the Processor Module: (see The C= Am iga A4000 User's Guide)
1. The A4000 CPU slot is located on the right side of the m otherboard. The
processor m odule occupies this slot, m ounted horizontally parallel with
the m otherboard.
2. Hook your fingers under the m odule at either end of the slot and lift.
CAUTION: Do no lift elsewhere on the processor m odule, or you m ay crack the
m odule or it connector.
Installation of the ROM chips:
1. Locate the ROMs in the front left of the m otherboard, just left of the CPU
slot, between RAMSEY and the oscillator.
2. The left ROM-socket is m arked as U176, the right ROM-socket is m arked as
To
W orkbench 3.1
W orkbench 3.5 / 3.9
23
Requirem ents
Kickstart 3.1
Kickstart 3.1, 6M RAM,
68020 processor, Hard Disk,
CD ROM