Checked boot code and it was not compatible with OS(Win2k, Mac OS 9 and X).

Updated boot code to current (33.02) and firmware (6.06) then all worked fine. Boot code 33.02 must be implemented with Firmware 6.06 or better.

May also be a problem with MacOS 9 and X. Mac OS 9 can use the system extension (driver) included in the MTA128ST.HQX or MTA128ST.sit file on the FTP site (MacScripts directory). Mac OS X requires a driver (which we don't have) or CDC support which is new in the 33.02 boot code.