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Copyright 1991 David Jurgens |
INT 14,0 - Initialize Communications Port Parameters
AH = 00
AL = parms for initialization (see tables below)
DX = zero based serial port number (0-1) (0-3 for AT)
│7│6│5│4│3│2│1│0│ AL Parity (bits 4 & 3)
│ │ │ │ │ │ └─┴──── word length bits 00 = none
│ │ │ │ │ └─────── stop bits flag 01 = odd
│ │ │ └─┴──────── parity bits 10 = none
└─┴─┴─────────── baud rate bits 11 = even
Word length (bits 1 & 0) Stop bit count (bit 2)
10 = 7 bits 0 = 1 stop bit
11 = 8 bits 1 = 2 stop bits
Baud rate (bits 7, 6 & 5)
000 = 110 baud 100 = 1200 baud
001 = 150 baud 101 = 2400 baud
010 = 300 baud 110 = 4800 baud
011 = 600 baud 111 = 9600 baud (4800 on PCjr)
on return:
AH = port status
AL = modem status
- for status bits see INT 14,STATUS
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| Esc or Alt-X to exit |
int 14,0 |
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