Table of Contents
Note: This IBM PC BIOS API call is for DOS/Win16 personality only. Use Family API for portability.
Note: osFree Macro Library provides macros for most of functions
Int 14H, AH=00H
Version
IBM 5150 and higher
Brief
Initialize serial port
Family API
Input
- AH = 00h
- AL = port parameters (see #00300)
- DX = port number (00h-03h) (04h-43h for Digiboard XAPCM232.SYS)
Return
- AH = line status (see #00304) FFh if error on Digiboard XAPCM232.SYS
- AL = modem status (see #00305)
Macro
INCLUDE BIOS.INC @AuxInit 0, A3H
Notes
- default handler is at F000h:E739h in IBM PC and 100% compatible BIOSes since the PCjr supports a maximum of 4800 bps, attempting to set 9600 bps will result in 4800 bps
- various network and serial-port drivers support the standard BIOS functions with interrupt-driven I/O instead of the BIOS's polled I/O
- the 1993/04/08 Compaq system ROM uses only the low two bits of DX
- the default setting used by DOS (MS-DOS 6, DR-DOS 7.03, PTS-DOS) when (re-)initializing the serial devices is AL=A3h (2400 bps, no parity, 1 stop bit, 8 data bits).
Note
Text based on Ralf Brown Interrupt List Release 61
| IBM PC BIOS API | |
|---|---|
| Video I/O | INT 10H: 00H, 01H, 02H, 03H, 05H, 06H, 07H, 08H, 09H, 0AH, 0BH, 0CH, 0DH, 0EH, 0FH |
| Hardware info | INT 11H, INT 12H |
| Serial I/O | INT 14H: 00H, 01H, 02H, 03H |
| Tape I/O | INT 15H: 00H, 01H, 02H, 03H |
| Keyboard I/O | INT 16H: 00H, 01H, 02H |
| Printer I/O | INT 17H: 00H, 01H, 02H |
| Disk I/O | INT 13H: 00H, 01H, 02H, 03H, 04H, 05H |
| Date and Time | INT 1AH: 00H, 01H |
| osFree Macro Library | |
|---|---|
| Video I/O | @SetMode @SetCurSz @SetCurPos @GetCur @SetPage @ScrollUp @ScrollDn @Scroll @GetChAtr @PutChAtr @PutCh @SetPalet @SetColor @SetDot @GetDot @WrtTTY @VideoState @GetMode @GetDisplay @GetVideoState @GetEGAInfo @Cls |
| Hardware info | @Equipment @MemSize |
| Serial I/O | @AuxInit @AuxSendChar @AuxRecieveChar @AuxStatus |
| Tape I/O | @TapeOn @TapeOff @TapeRead @TapeWrite |
| Keyboard I/O | @KbdStatus @CharIn @CharPeek |
| Printer I/O | @PrnPrint @PrnInit @PrnStatus |
| Disk I/O | @DskReset @DskStatus @DskRead @DskWrite @DskVerify @DskFormat |
| Date and Time | @SetTime @GetTime |
| Mouse | @MouInit @MouShowPointer @MouStatus @MouSetPos @MouSetMickey @MouRegion |
| Memory manager | @ModBlok SET_BLOCK |