OSWORD &5A
OSWORD &5A (90 ) - HADFS Sector read/write/access HADFS
This can be called by the user to perform an operation, or called by HADFS to access an external drive where a supporting routine should respond. On entry: XY+0..1 must contain &0600 XY!2 =data address XY!6 =sector address with the drive number in the top byte (ie XY?9) XY?10 =number of sectors to transfer XY?11 =call type and returned result code A supporting routine should only claim the call if the call type is <&80, and the drive number is the one supported. Call types to recognise (do NOT call these) are: 1=write 2=read 3=disk size request 4=format 5=bye (ie, dismount - do NOT claim) User call types are: &80=read &81=write Result codes are as for OSWORD &7F (127) plus &FE=Drive not present. If any external support routines leave the call type byte unchanged, HADFS changes it to &FE, Drive not present. HADFS will not clash with DVR as long as HADFS is in a higher priority ROM socket than DVR is.
OSWORD &5A (90 ) - Find node in binary tree DVR
On entry: XY+0..1=address of the root of the tree XY+2..3=address of a data comparison routine XY+4..5=address of the data to find On exit: XY contain the address of the node found C is set if the data was not found.
See Also
Jgharston 13:06, 26 May 2009 (UTC)
