MTR90 mkII CPU card - with MTR90mkIII EPROM PB-4ApA

The mkIII CPU card - with one EPROM - work with the mkII machines as follows:
lots 'I thru P' use EPROM PG06011D
lots 'Q and up" use EPROM PG06011E
Note: Units with the EC-101 required different EPROMS !

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