I have a Tandy 1000 SX with MSDOS 4.01 loaded on it to support an external 2GB SCSI drive. I've tried extracting what looks like a keyboard driver (driver.sys) from the disk images of Tandy DOS for the 1000SX, but the when I try to load the driver, it complains about an invalid keyboard definition. Is there a keyboard driver I can load to properly map the Tandy keyboard in DOS 4.01 or would I have to downgrade to Tandy DOS 3.3 and be stuck with a bunch of 20MB partitions?