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From: luis@grinch.UUCP (luis)
Newsgroups: comp.sys.ibm.pc,comp.lang.c
Subject: Re: Looking for C functions to access PC memory
Message-ID: <261@grinch.grinch.UUCP>
Date: Sat, 7-Nov-87 23:43:36 EST
Article-I.D.: grinch.261
Posted: Sat Nov  7 23:43:36 1987
Date-Received: Wed, 11-Nov-87 02:39:49 EST
References: <24261F3U@PSUVMB> <447@ucdavis.ucdavis.edu>
Reply-To: luis@grinch.UUCP (Luis Chanu)
Organization: Textural Software, San Jose, CA.
Lines: 27
Keywords: Using pointer in C
Xref: mnetor comp.sys.ibm.pc:9907 comp.lang.c:5338

In article <447@ucdavis.ucdavis.edu> kwok@iris.UUCP (Conrad Kwok) writes:
>When you are using C, you don't need any special routine to read
>memory. All you need to do is to declare a pointer (near or far
>depending on the address) and then you may read or write to that
>location using normal assignment statements. Here is an example to
>read the value at location 0xC000:0x0100
>
>	char far *ptr;
>
>	ptr = (char far *) 0xC0000100L;
>	printf("Value at 0xC000:0x0100 is %d\n", *ptr);
>
>[...]

Thank you for posting the example, but I have a few questions...
  1. Why is there an 'L' at the end of the address?  (does it stand for Long?)
  2. I have been trying to access the DTR on my modem, but I don't know
     what the base address is.  From the Technical Reference, I know that
     the offset is 3FE (bit 0), but can't find the base addres..  Can anyone
     help?

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Luis Chanu                             "Live every day as if it were your last,
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