2140 INT 21 - DOS 2+ - "WRITE" - WRITE TO FILE OR DEVICE
2140 INT 21 - Turbo Debug HARDWARE BREAKPOINTS - SEND CMD TO HARDWARE BRKPNT DRIVER
2140 INT 21 - PC/TCP IPCUST.SYS - WRITE CONFIGURATION DATA
2140 INT 21 U - Trusted Access - NB.SYS - SET STATE
214000BX0002 INT 21 - FARTBELL.EXE - INSTALLATION CHECK
214001BX0002 INT 21 - FARTBELL.EXE - FORCE NOISE