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From: bpm@psueclb.BITNET
Newsgroups: comp.lang.c
Subject: Re: Absolute addressing in Turbo-C
Message-ID: <792@PSUECLB>
Date: Sat, 22-Aug-87 14:47:55 EDT
Article-I.D.: PSUECLB.792
Posted: Sat Aug 22 14:47:55 1987
Date-Received: Wed, 26-Aug-87 00:37:17 EDT
Organization: Engineering Computer Lab, Pennsylvania State University
Lines: 22


>[I] am trying to rewrite my Turbo Pascal routines for communicating with
>the PG-Adaptor in C, a language in which I have some programming
>experience, but am no expert in.
>I have to use absolute addressing, because of various buffers and variables
>that both the PGA and I need to access. To illustrate, some of the original
>Turbo Pascal declarations:
>
>  VAR  outBuffer : ARRAY [0..255] OF BYTE ABSOLUTE $C000:$6000;
>       outHead   : BYTE ABSOLUTE $C000:$6300;
>       outTail   : BYTE ABSOLUTE $C000:$6301;
>

To declare an absolute pointer in Turbo C, use the "far" adjective.
For example, the equivalent to the above is:

        char far outBuffer[256] = 0xC0006000;
        char far *outHead = 0xC0006300;
        char far *outTail = 0xC0006301;

--whiffle