IBM 1725 SLS - Manual (Page 227)

Updating
System
Software
8-43 Printer Options
unique. The recommended device number for the internal SCSI hard
disk, if present, is DSK6.
» Note: For the printer to recognize any attached hard disk(s), each hard
disk must be turned on before you turn on the printer. DISK ONLINE
appears on the start-up page if the printer recognizes the disk(s).
Updating System Software
The system software in your QMS 1725 SLS Print System is stored
on flash ROM, read-only memory that can be erased and rewritten to
“in a flash.” This allows you to update the system software without
opening up the printer and installing new PROMs. Updated system
software allows you to take advantage of future enhancements to the
printer.
» Note: The software loadable system mentioned in this section does not
modify the code used by QMS Viking Interface cards.
Procedure
Use the following procedure to update the system software in flash
memory when downloading through the parallel port.
Decompressing the System Software
Before the printer system software can be downloaded, it must be
decompressed on your PC’s hard disk.
1 Create a new directory on your PC.
DSK6
Optional Disks
(DSK0 - DSK5)
Internal Disk