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From: schaefer@ogcvax.UUCP
Newsgroups: comp.sys.cbm,comp.sys.misc
Subject: C-Power 64 sys call -- HELP!
Message-ID: <1244@ogcvax.UUCP>
Date: Sun, 5-Apr-87 21:20:59 EST
Article-I.D.: ogcvax.1244
Posted: Sun Apr  5 21:20:59 1987
Date-Received: Tue, 7-Apr-87 05:42:08 EST
Reply-To: schaefer@ogcvax.UUCP (Barton E. Schaefer)
Organization: Oregon Graduate Center, Beaverton, OR
Lines: 47
Xref: utgpu comp.sys.cbm:305 comp.sys.misc:483
Summary: sys doesn't work

[I always see these silly line-eater things, so here's mine]

I am having massive difficulties with the sys function in C-Power.

I am trying to make a call to GETIN (0xFFE4) to read a character from the
keyboard without having to wait for a carriage return.  (If you know of a
way to do this without using sys, I'd like to know about it.)  Following
the example on page 46 of the C-Power manual, I wrote:

    #define peek(x)	*((char *)(x))
    #define poke(x,y)	*((char *)(x))=(y)

    xget(c)
    char *c;
    {
	char x, y, d;

	d = peek(0x99);		/* save the current input device */
	poke(0x99,0);		/* set input from keyboard */
	for (*c = '\0'; (*c == '\0'); )
	    sys(15,0xffe4,c,&x,&y);	/* call GETIN */
	poke(0x99,d)		/* restore the input device */
    }

The result of this, when I tested it in a short program, was to kick me clear
out of the shell and back to a VERY screwed-up BASIC.

I then tried the example from page 46 (calling CHROUT to print a string), and
this had the same effect.  I tried calling CHROUT through the jump table
(0xffd2) and directly (0xf1ca), and with every bank number from 0 to 15 (the
first argument to sys is the bank number, with a mysterious reference to the
BASIC BANK command -- is this C-128 related?), and the only differences were
that some odd (i.e., non-even) bank numbers locked up the system completely
instead of just clobbering BASIC.

What's going on here?  Is my C-64 weird in some way, or do I have a strange
sys manual page, or does sys just plain not work?  HELP!  HELP!  HELP!

Please reply via a posting rather than through E-mail, as a recent "upgrade"
to 4.3 BSD has (temporarily?) messed up mail from some of our UUCP connections.

Thanks in advance ....
-- 
Bart Schaefer						Dept. of CS&E
CSNET:	schaefer@Oregon-Grad				Oregon Graduate Center
UUCP:	{ihnp4,seismo,sun}!verdix \			19600 NW Von Neumann Dr
 {hplabs,ucbvax,decvax}!tektronix  !ogcvax!schaefer	Beaverton, OR  97006