Acorn BBC Micro Model B OS 1.20 ROM, original Hitachi part HN613128PB04.
Ideal as a replacement for a faulty one, or to upgrade your earlier machine that is fitted with the original OS 0.1 to the later OS 1.20, for the best compatibility. To check what version of OS you have in your machine, turn it on and type:
*FX0
A result of OS EPROM 0.1 means an upgrade is advised.
The item photo is a sample of the IC you will receive. It will be a genuine Hitachi HN613128PB04 ROM, but may be a different date code. Item supplied is used and tested.
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