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Comment: VCB02 syntax and explanations correction

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The dummy VCB02 device emulates the QBUS registers of a VCB02 graphic controller (at the secondary VCB02 device address) but does not implement graphic display functionality. Its purpose is to be able to use a workstation version of VMS. When this device is loaded, VAX/VMS requires type "D" licenses (Workstation). As the dummy VCB02 is located on the secondary address (0x3fff02HEX:0x3fff02  OCT:01777402), VMS boots using the normal console terminal without graphics capability.

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