From: G DOT Ohrner AT t-online DOT de (Gunter Ohrner)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: serial ports: library supported?
Date: 29 Jan 1997 22:39:38 GMT
Organization: Telekom Online Internet Gateway
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

Bill Murphy wrote:
> A friend of mine asked me to dig up information regarding rs232 (serial
> or com port) use with dgjpp -- and though I dug (read the dgjpp faq,
> stuff about capturing interupts, etc...) I just didn't see anything
> appropriate.
>         How can you set port parameters {baud, parity, etc}?
> 
>         How can you send/recieve a character to/from a com port?
> 
>         Will he need to catch the interupt, and look at some icky
>           absolute memory location?
> 
>         Where can I find the hex location for common com1 com2 ports?
>           IRQ numbers?
You can access the serial port via the BIOS.
I don't know if DJGPP already has special functions but using int 14h
you'll be able to access the com-port from any language.
For details (int 14 interface description, etc) just send a mail to me.
I only fear I cannot help you implementing the int calls in DJGPP for
I'm a C newbie...
I don't know how to call realmode interrupts from protected mode. (I
think you'll have to use the DPMI)
If someone could help me with this problem that would be quite nice.

-- 
C U !

Gunter "REBOOT" Ohrner

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