Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!evax!cs4344af
From: cs4344af@evax.arl.utexas.edu (Fuzzy Fox)
Newsgroups: comp.sys.cbm
Subject: Re: C128 Programming question
Message-ID: <1990Nov16.221620.10964@evax.arl.utexas.edu>
Date: 16 Nov 90 22:16:20 GMT
References: <1990Nov13.043708.23063@DMI.USherb.CA> <1990Nov13.162259.981@vax5.cit.cornell.edu> <4125.27440883@cc.nu.oz.au>
Organization: Computer Science Engineering Univ. of Texas at Arlington
Lines: 29

In article <4125.27440883@cc.nu.oz.au> c0037544@cc.nu.oz.au (David Williams) writes:
>The escape character (ascii 27) followed by any of the cursor escape sequences
>(u,s,e,f) will turn the cursor on in a program on the 80 column screen. As the
>cursor may only be a block on the 40 column screen, the u and s sequences are
>invalid, but the e and f sequences will still work. Just send these to the
>Kernel routine at $ffd2 at the start of the program, and there you are!

There are some ROM routines in the Kernel devoted to cursor control on
the C128.  Compute!'s "Mapping the Commodore 128" lists these routines:

	CURSORON	$CD6F
	CURSOROFF	$CD9F

These routines will turn the cursor on or off, accordingly.  They will
work no matter which screen (40 or 80) is active.  When using these
routines, you should turn the cursor on, wait for a keypress, then turn
the cursor off before printing any characters.  For example:

GETCHAR:
	JSR  CURSORON
LOOP:	JSR  GETCHAR
	BEQ  LOOP
	PHA
	JSR  CURSOROFF
	PLA
	RTS

Happy computing!
						Fuzzy Fox