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From: sentinel@killer.UUCP (The Sentinel)
Newsgroups: comp.sys.cbm
Subject: Re: C-power information for a 128
Message-ID: <1003@killer.UUCP>
Date: Mon, 15-Jun-87 02:18:16 EDT
Article-I.D.: killer.1003
Posted: Mon Jun 15 02:18:16 1987
Date-Received: Thu, 25-Jun-87 00:53:09 EDT
References: <243@uwslh.UUCP> <3680@garfield.UUCP> <3682@garfield.UUCP> <361@polyslo.UUCP>
Distribution: na
Organization: A Un*x Box in Texas
Lines: 35

In article <361@polyslo.UUCP>, jchikin@polyslo.UUCP (Joe   Chikin) writes:
> [...] Also, where
> did you find the info to open the channel. [...]

    It's done the same way as in BASIC.  open(a,b,c,"d") in C is the same as
OPEN a,b,c,"d" in BASIC.  The array of characters I used for the filename
holds the values for the RS-232 control register, command register, and user
defined baud rate in the same order you would place them in BASIC.  I won't
go into any more detail... just follow the instructions in the Programmers
Reference Guide or any other suitable book.
    BTW, my mention of Kernal routines in the previous message may have been a
bit unclear.  It appears from my experiments that the regular C library
routines are not really meant for RS-232 I/O and don't do quite what I want.
You should probably try them for yourself, though.  Anyway, I found that
simply calling the Kernal was the easiest way of using the port... for output
the C routines were OK, but for input I ended up using the Kernal directly.
    Finally, in the C open() function, the first number is the file number,
which is the same as the channel number under C.  So, you can use it anywhere
a parameter of type FILE is required.  I used 50 in the example, because I
am not sure what range the C library uses.

> [...] Also, do you know where I might find a memory map
> of C-Power 128.  I want to know if I can access zero-page or some
> of the system vectors in low mem.

    I'm not sure yet.  C-Power steals a couple of vectors, and probably uses
every free location in zero page.  It also uses the cassette buffer for
arguments.  If you find any more on this, please post it... in the meantime
I'll keep digging and experimenting...

-- 
Rob Tillotson				...ihnp4!killer!sentinel
3922-1 Newport Ave.				-or-
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