http://www7.software.ibm.com/2bcprod.nsf/...
The OS/2 Quatech USB to Serial Driver Package (USBQSER.EXE) provides support for USB to Serial Adapters manufactured by Quatech, Inc. on the OS/2 Operating System. The supported Quatech adapters are the:
* SSU-100 (1-Port USB to RS-232 Serial Adapter)
* DSU-100 (2-Port USB to RS-232 Serial Adapter)
* QSU-100 (4-Port USB to RS-232 Serial Adapter)
* ESU-100 (8-Port USB to RS-232 Serial Adapter)
* HSU-100 (16-Port USB to RS-232 Serial Adapter)
Quatech USB to RS-232 serial adapters are easily configured to enable the continued use of legacy devices without making any changes to the applications written for them. The adapters enumerate themselves as standard COM ports making the USB interface completely transparent to software.
Source: os2.JP