OSBYTE &49

OSBYTE &49 (73) - Integra-B calls

   On entry:
     X=&FF - returns X=&49 indicating Integra-B is present
     X<&FF - other calls
   On exit:
     X=&49 - called with X=&FF and Integra-B is present
     X=&FF - call unsupported

See Also

• OSBYTE &49 - Check for Integra-B shadow memory
• OSBYTE &6C - Select Master/Integra-B shadow memory
• OSBYTE &6F - Select Aries/Watford shadow memory
• OSBYTE &70 - Select memory for Master VDU access
• OSBYTE &71 - Select memory for Master video display
• OSBYTE &72 - Select future use of shadow memory
• OSBYTE &73 - Select shadow bank
• OSBYTE &74 - Check for Solidisk shadow memory
• Paging in video memory
• http://mdfs.net/Docs/Comp/BBC/Osbyte00

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Jgharston (talk) 20:29, 3 April 2015 (UTC)