Specifications

3000
Serial port upgrade
Introduction
The A3000 computer is fitted with a 9-way D-type
serial connector on the back panel, but this is not
functional-until a serial port upgrade kJt has been fitted
by an Acorn Dealer or Approved ServJce Centre.
Only Acorn Serial Port Upgrade kits should be used.
The A3000 serial port upgrade consists of a serial
processor chip and a line driver chip, which fit into
existing sockets on the PCB.
Fitting the Acorn A3000 serial port upgrade
1 Follow the procedures in the next chapter for the
removal of the cover and the keyboard.
2 Bemove the Econet module and the User Port /
MIDI expansion card, if fitted.
3 Insert the 28-pin IC 65C51 into socket IC1, and the 24-
pin IC LT1133 into socket 1C7. The notched ends of
the ICs should face towards the left hand side of the
PCB (viewed from the front of the computer) :
4 Fit the serial number label to the PCB near the
upgrade 1Cs.
5 Refit any modules and expansion cards removed in •
step 2 above, and replace the cover of the
computer.
6 Remoye the labe1 'Seria1 not fitted' from the rear
panel.
7 Run the dealer test software to test the correct
function of the computer and the serial port, and of
any other upgrades disturbed during this
installation.
A3000 expansion