Motorola MVME166IG/D2 - Manual (Page 63)

Disk I/O Support
MVME166IG/D2 3-17
3
IOC (I/O Control)
IOC allows you to send command packets as defined by the particular
controller directly. IOC can also be used to look at the resultant device packet
after using the IOP command.
BO (Bootstrap Operating System)
BO reads an operating system or control program from the specified device
into memory, and then transfers control to it.
BH (Bootstrap and Halt)
BH reads an operating system or control program from a specified device into
memory, and then returns control to 166Bug. It is used as a debugging tool.
Disk I/O via 166Bug System Calls
All operations that actually access the disk are done directly or indirectly by
166Bug TRAP #15 system calls. (The command-level disk operations provide
a convenient way of using these system calls without writing and executing a
program.)
The following system calls are provided to allow user programs to do disk
I/O:
Refer to the Debugging Package for Motorola 68K CISC CPUs User’s Manual for
information on using these and other system calls.
.DSKRD Disk read. System call to read blocks from a disk into memory.
.DSKWR Disk write. System call to write blocks from memory onto a disk.
.DSKCFIG Disk configure. This function allows you to change the configuration
of the specified device.
.DSKFMT Disk format. This function allows you to send a format command to
the specified device.
.DSKCTRL Disk control. This function is used to implement any special device
control functions that cannot be accommodated easily with any of the
other disk functions.