OSBYTE &FF

OSBYTE &FF (255) - Read/Write startup Options

   This is a copy of the keyboard links taken at last hard reset
   b0..2=screen mode
   b3   =if clear then the action of SHIFT/BREAK is reversed
   b4..5=define disk drive speed  step time  settle time  head load
               b5=0  b4=0            4ms        16ms         0ms
               b5=0  b4=1            6ms        16ms         0ms
               b5=1  b4=0            6ms        50ms         32ms
               b5=1  b4=1            24ms       20ms         64ms
   b6   =HADFS: 0=drive 1 external, 1=drive 1 internal, via OSWORD &7F
   b7   =DNFS: 0=NFS priority, 1=DFS priority
   b7   =ENFS:

See Also

• http://mdfs.net/Docs/Comp/BBC/OsbyteA6

Jgharston 23:21, 26 May 2009 (UTC)