Field Change Order: 2015 Date of Issue : 28/03/90 Applicable to : Master 128 Reason for Issue: Some Master 128 System ROMs are Direct - Soldered to the PCB. If a ROM upgrade is fitted, then a socket should be fitted first. Types Affected: Approximately serial numbers 01-AMB15- 0015001 to 01-AMB15- 0022513 Description of Change: Before fitting ROM upgrade: Desolder System ROM (IC24 - Acorn Part Number 2201,239). Fit 28 Pin IC Socket (Acorn Part Number 0800,129) in position IC24. Claim Procedure: Following completion of the field change order instructions, service engineers should fill out a service report clearly stating the serial no. of the host unit, the FCO no. (above), and claim the FCO credit rate (below) for labour charges. Any replaced components should be wrapped to ensure safe carriage and returned with the service report. Acorn will verify the information and, process the claim for labour charges and issue any replacement components as necessary. Rework Doc. Reference: 2015 FCO Credit Rate: £16.00 (sixteen) Special Instructions: