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From: daveb@cbmvax.cbm.UUCP (Dave Berezowski)
Newsgroups: net.micro.amiga
Subject: Re: SuperBitMap, Console IO - Questions
Message-ID: <28@cbmvax.cbmvax.cbm.UUCP>
Date: Sun, 23-Mar-86 11:52:59 EST
Article-I.D.: cbmvax.28
Posted: Sun Mar 23 11:52:59 1986
Date-Received: Tue, 25-Mar-86 04:19:02 EST
References: <567@uw-june>
Organization: Commodore Technology, West Chester, PA
Lines: 52

>  By the way, any chance of adding Scrollable regions to the Console devices
>  repertoire of escape codes? That seems to be the only thing standing between
>  me and my VAX (VMS) editors (EDT, TPU).
> 	Thanks for any pointers.
> 	Cheers

*** REPLACE THIS LINE WITH YOUR MESSAGE ***

	The console device already has set scrollable region commands
(sort of). They can be found in the Amiga DOS Deveoper's Manual on
page A-7 (old white book). The commands are:

CSI Ps t - set page length
CSI Ps u - set line length
CSI Ps x - set left offset
CSI Ps y - set top offset

	I've used set top offset and set page length to emulate the
scrollable window regions of a VT100; a code segment follows.

set_windows(top_row,bottom_row)
UBYTE top_row, bottom_row;
{
	WRITE (CSI); /* control sequence introducer $9b */
	WRITE ('H'); /* home cursor THIS IS IMPORTANT */

	digits(--top_row * 8); /* convert top_row argument to pixels
                                  and then to ascii digits */
	WRITE (CSI);
	WRITE (huns);
	WRITE (tens);
	WRITE (ones);
	WRITE ('y'); /* set top offset */

	digits (bottom_row - top_row); /* comp length and conv to ascii */
	WRITE (CSI);
	WRITE (tens);
	WRITE (ones);
	WRITE ('t');	/* set page length */

	The above really isn't a code segment, but I imagine that you get
the idea. Some notes:

a) WRITE - outputs a char to the console device
b) digits - converts a # to its ascii digits in huns, tens, & ones.
c) YOU ABSOLUTELY HAVE TO HOME THE CURSOR FIRST
d) The ('* 8') is there as I am working with a font that is eight pixels
   high; you may want to use a variable instead.

	Have fun!

	Regards, David Berezowksi (daveb@cbmvax)