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RetroClinic DualOS

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RetroClinic DualOS box

RetroClinic DualOS box 

RetroClinic DualOS contents

 RetroClinic DualOS contents of box

The DualOS kit contains:

RetroClinic DualOS board

RetroClinic Dual OS circuit board 

The DualOS board is configured with 2 x 1Mbyte banks, one is MOS3.20, the other MOS 3.50. The switch selects the appropriate one at start up.

RetrocClinic DualOS instructions

RetroClinic Dual OS Instructions 

The instructions are simiple to follow, basically remove the old Acorn ROM, install the DualOS board and the switch, CNTL-BREAK and off you go! Also include is the MOS3.50 User Guide which covers the differences between MOS3.20 and 3.50, it also covers the changes to the applications icluded in the MOS ROM.

RetrocClinic DualOS fitted in Master

 RetroClinic DualOS fitted in Master.

The RetroClinic DualOS board is a replacement for the Acorn ROM and the other ROM images contained in it (Terminal, View, ADFS, BASIC, Edit, Viewsheet and DFS). It allows the user to sellect MOS 3.20 (for compatability) or MOS 3.50 at startup using a switch. In particular the ADFS ROM has been changed replacing the Acorn SCSI code with support for IDE devices across the 1MHz bus (also changed in the MOS3.20 ROM). This enable the Master to use modern IDE drives and Compact Flash cards.

I decided to upgrade a Master 128  to the ultimate specification and istalled the Dual OS ROM in it.