Motorola MVME162 Manuale Utente

Disk I/O Support

3-15

 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.

 reads an operating system or control program from the specified device 

into memory, and then transfers control to it.

 reads an operating system or control program from a specified device into 

memory, and then returns control to 162Bug. It is used as a debugging tool.

All operations that actually access the disk are done directly or indirectly by 
162Bug 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.