Difference between revisions of "OSBYTE &FF"
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b0..2=screen mode | b0..2=screen mode | ||
b3 =if clear then the action of SHIFT/BREAK is reversed | b3 =if clear then the action of SHIFT/BREAK is reversed | ||
| − | b4..5= | + | b4..5=disk drive speed step time settle time head load |
b5=0 b4=0 4ms 16ms 0ms | b5=0 b4=0 4ms 16ms 0ms | ||
b5=0 b4=1 6ms 16ms 0ms | b5=0 b4=1 6ms 16ms 0ms | ||
b5=1 b4=0 6ms 50ms 32ms | b5=1 b4=0 6ms 50ms 32ms | ||
b5=1 b4=1 24ms 20ms 64ms | b5=1 b4=1 24ms 20ms 64ms | ||
| − | b6 =HADFS: 0=drive 1 external, 1=drive 1 internal, via OSWORD &7F | + | b6 =HADFS: 0=drive 1 external, 1=drive 1 internal, via OSWORD &7F |
| − | b7 =DNFS: 0=NFS priority, 1=DFS priority | + | b6 =ENFS: 0=unPROTed on Break, 1=PROTed on Break |
| − | b7 =ENFS: | + | b7 =DNFS: 0=NFS priority, 1=DFS priority |
| + | b7 =ENFS: 0=use buffered I/O and raise PAGE by &100, 1=don't use buffered I/O | ||
| + | b7 =Master: screen mode b7 | ||
==See Also== | ==See Also== | ||
* http://mdfs.net/Docs/Comp/BBC/OsbyteA6 | * http://mdfs.net/Docs/Comp/BBC/OsbyteA6 | ||
| − | [[User: | + | [[User:WikiSysop|WikiSysop]] ([[User talk:WikiSysop|talk]]) 13:36, 8 March 2015 (UTC) |
Latest revision as of 03:42, 15 March 2018
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=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
b6 =ENFS: 0=unPROTed on Break, 1=PROTed on Break
b7 =DNFS: 0=NFS priority, 1=DFS priority
b7 =ENFS: 0=use buffered I/O and raise PAGE by &100, 1=don't use buffered I/O
b7 =Master: screen mode b7
