All,
I have extensive experience with Aria and O250/O350 systems. I can perform all these taks mentioned here, but it is not something that can be easily communicated. In fact, when I was mentoring other techs in my former company (an easy guess), the requirement was that I would explain it all to them, show them by typing it myself, then observe them making changes (mostly to the SST) at least 3 times, all before they were allowed to perform this on their own.
1) There is a way to get into the Aria without having the Pri SM Mbx pswd or the 2ndary SM Mbx. There are absolute requirements that must be known in order to "crack" the Aria.
2) The engineering bit can be turned on during the boot up process, but like it was mentioned before, if you dont know or have experience editing offsets, then better off leaving it to us who can and have done this before.
3) The engineering bit allows additional sub-menus, commands, and functions to be run/displayed.
4) If your Aria does not boot and you do not know which drive (0 or 1) the system drive WAS, then try using disk drive slot 0 and boot it up. If that fails (usually with a serial number issue), then move the system drive to disk drive slot 1 and it should boot there. This presumes the system drive is a system drive from the system your are trying to boot up. In other words, one cannot take a system drive from machine "A" and try to boot it up in machine "B" when "B" has an additional system drive. The drives have disk drive serial numbers written to each drive.
5) The number of digits in the SM Mbx password is admin'd in the system as a minimum. It can have up to 15 digits. I have seen a few 3 digit systems, most are either 4 to 6 digits. Yes some even use the serial number from the placard on the back of the machine, and sometimes the SN is repeated once (Ex: 1357913579).
6) One can edit/change/write the SST and is not dependent upon a release. 1.0 up to & including 3.11.05-1.
7) The service bit can be turned on by the string stated above by KenM. However, the engineering bit requires either a reboot and edit of memory/SST offsets, OR, a Win 3.1 PC (386 of course!) with a dialogic card and the engr bit SW floppy disks to be installed.
I would be happy to assist someone further if needed.
Pat