JOSDOS:    identical to SYS5-1F: 80-col VDU, JOS=Typo for TOS? Toshiba disk drive
SHUDOS:    identical to SYS5-1F: 80-col VDU, SHU=Shugart disk drive
TANDOS:    identical to SYS5-1F: 80-col VDU, TAN=Tandata disk drive
TANDOS80:  identical to SYS5-1F: 80-col VDU, TAN=Tandata disk drive
TOSDOS40:  minor differences:    40-col VDU, TOS=Toshiba disk drive, different disk speed
TOSDOS80:  identical to SYS5-1F: 80-col VDU, TOS=Toshiba disk drive
UNKDOS80:  identical to SYS5-1F: 80-col VDU
TOSDOS-S3: idential to TOSDOS40: 40-col VDU, TOS=Toshiba disk drive