Printer Functions

 05H and 40H (BX=4) write data to PRN         │ ASCII Control Codes     │
                                              │ ASCII Table3301H notice Ctrl+Break during PRN output    │ Epson/IBM Printer Codes │
                                              │ I/O Redirection4407H get output status (check for busy)     └─────────────────────────┘
 440aH see if PRN is on a remote server
 440cH 45H set retry iteration count

 5e02H set network printer setup
 5e03H query network printer setup

 INT 24H Critical Error (get control on printer error)
 INT 2fH 01xxH Print.Exe spooler services

 INT 17H BIOS printer services

 INT 05H Print screen
 INT 0dH and INT 0fH LPTn IRQ handlers
 File Handles  National Language Support (font downloading)  Service Groups