Call Siemens tech support @ 800-879-8079 x2. You will likely get a call back from Dave Lyle. Siemens may start charging for support of "Legacy" products, although they still sell the Acromatic control line. There are (2) documents which apply to the CMOS settings you are looking for depending on the BIOS of the control motherboard. One is a spreadsheet and one is a word document. Siemens doesn't appear to have any documentation on the Real Time motherboard CMOS settings, but you basically need to disable everything you can and make sure to select stop on "NO" errors (i.e. no keyboard or floppy installed). I'm currently in the middle of helping a customer with a similar problem which includes a hard drive crash. Siemens is the official support vendor for most of the old Vickers Acromatic 2100 software issues. I haven't researched the possibilities for their support of the hardware side of the older Acromatic 2100 product line. Industrial electronics repair is actually what our company specializes in (motor controls/servo amps, motors/encoders, PLCs, industrial computers, etc.). The one part of the A2100 controller software solution they do not support is the "Machine Tool Builder MAI (Machine Application Interface)" software. This is supposed to be supplied by the machine tool builder, in this case - Tree Machine Tool Company, Inc. This is the software component that links the specific servo amps, position feedback devices, and options control I/O used by the machine manufacturer to the base Vicker's control software environment. The MAI software is not to be confused with the machine data backup file, which seems to contain the specific parameter settings for all of the devices used on the machine. Let me know if you need any further help with your specific issue. http://www.sterlingsevices.com (704) 821-3300. I am currently trying to locate a source for any version of the MAI software for a Tree VMC500. Other Tree models may or may not use identical MAI software. This software would likely have been included on a floppy disc with the documentation provided with the machine. As stated earlier, my customer's hard drive crashed. Since then I have been able to obtain the latest version (v2.34) of the A2100 base and NCX software components from Siemens running under Windows NT v4.0 SP 6a. Siemens indicated that they should be able to provide various versions of A2100 hard drive images minus the MIA software and machine data file going back to those released on the NT v3.51 OS. If anyone reading this thread has a copy of any version of the Tree MAI software disc available, please contact me at the number above. Don't have the floppy disc ? You still might be able to help. All of the A2100 mechanical hard drives will eventually fail. If you don't have a backup image of the entire A2100 hard drive (which includes the MAI software, machine data file and software authorizations) that can be restored to a replacement device, you will not be able to return your A2100 control to an operational state should the hard drive fail. If you have a restorable hard drive image file of any Tree machine with a Vicker's/Siemens A2100 control or would like to have one made, please contact me. I have been in contact with Ted Fleis at Eagle Machine Tool Corporation who has announced in this forum that Eagle has recently obtained all rights to the Tree Machine trademark, parts, inventory and IP. As of today, Ted has informed me that he is expecting to be in direct contact with executor of the estate of Dan Thorson (aka Tree Tech) of American Excel Inc. in hopes of making the Tree Machine MAI software available in the future. Until then, any help with obtaining the Tree MAI software disc or hard drive image would be appreciated.