![](/images/new-backgrounds/1192412/192412189x1.webp)
Disk I/O Support
When a disk transfer is requested:
❏Start and size of the transfer is specified in blocks
❏177Bug translates this into an equivalent sector specification
❏Passes the sector specification on to the controller to initiate the transfer
If the conversion from blocks to sectors yields a fractional sector count, an error is returned and no data is transferred.
Device Probe Function
A device probe with entry into the device descriptor table is performed whenever a specified device is accessed; i.e., when system calls:
❏.DSKRD
❏.DSKWR
❏.DSKCFIG
❏.DSKFMT
❏.DSKCTRL
or debugger commands:
❏BH
❏BO
❏IOC
❏IOP
❏IOT
❏MAR
❏MAW
are used.
B |