Groups > comp.sys.apple2.programmer > #1987

Plotting Text Characters on Hi-Res Graphics Screen

Newsgroups	comp.sys.apple2.programmer
Date	2015-11-29 07:55 -0800
Message-ID	<b301bba5-95f2-4592-bd27-556e290f42df@googlegroups.com> (permalink)
Subject	Plotting Text Characters on Hi-Res Graphics Screen
From	Mark Lemmert <mark.lemmert@gmail.com>

Show all headers | View raw

Does anybody know how to make ascii text characters appear on the Apple IIe/IIc Hi-Res Graphics screen using assembly language?

To clarify, I am not referring to the mixed mode setting that allows for a 4 line text window at the bottom of the graphics screen.....I mean actually plotting text characters on the graphics screen it self, in any location.

Any insights are greatly appreciated! Thanks!

Here is what I've tried so far:

I've read in several graphics books and multiple posts in this forum from the 1990s that placing text on the graphics screen is possible by essentially obtaining the shape table for the text character and copying it into video memory. I'm very familiar with Hi-Res Graphics in assembly, where I am getting stuck at is finding the shape tables.

The books/posts indicate that the ASCII characters can be used or a customized character set can be used, but stop short of explaining where the ASCII shape tables are or how to obtain a custom character set. There was some mention of software utilities in the posts, but they were all designed for applesoft, designed to provide the capability through the PRINT statement.

My initial thought was that maybe the low and high value on the Beagle Brothers ASCII chart is a clue (http://beagle.applearchives.com/the_posters/poster_1.html)

i.e. for the character "M", the low value is $4D and the high value is $CD.

I tried loading $4D, and $CD into $2000 (the first video memory address) and got a sold line filling the length screen byte 0 .....so this seems to be a dead end. I'd expect more that one address to store the bit map for the text character but this seems like the wrong track because the text character "M" does not contain a solid line equal to the width of the character.

There were some limitations described as far as exactly where on the Hi-Res screen the ASCII characters could go. I got the impression they would still more or less appear in the same rows/columns as they would on the text screen, it would just be visible while in graphics mode.

Back to comp.sys.apple2.programmer | Previous | Next — Next in thread | Find similar

Thread

Plotting Text Characters on Hi-Res Graphics Screen Mark Lemmert <mark.lemmert@gmail.com> - 2015-11-29 07:55 -0800
  Re: Plotting Text Characters on Hi-Res Graphics Screen qkumba <peter.ferrie@gmail.com> - 2015-11-29 08:43 -0800
    Re: Plotting Text Characters on Hi-Res Graphics Screen Mark Lemmert <mark.lemmert@gmail.com> - 2015-11-29 10:14 -0800
      Re: Plotting Text Characters on Hi-Res Graphics Screen gids.rs@sasktel.net - 2015-11-29 11:08 -0800
        Re: Plotting Text Characters on Hi-Res Graphics Screen Mark Lemmert <mark.lemmert@gmail.com> - 2015-11-29 21:46 -0800
    Re: Plotting Text Characters on Hi-Res Graphics Screen denisbytezone@gmail.com - 2015-11-29 18:49 -0800
      Re: Plotting Text Characters on Hi-Res Graphics Screen Mark Lemmert <mark.lemmert@gmail.com> - 2015-11-29 21:48 -0800
        Re: Plotting Text Characters on Hi-Res Graphics Screen Chris Torrence <gorthmog@gmail.com> - 2015-11-30 08:55 -0800
          Re: Plotting Text Characters on Hi-Res Graphics Screen D Finnigan <dog_cow@macgui.com> - 2015-11-30 17:22 +0000
          Re: Plotting Text Characters on Hi-Res Graphics Screen Mark Lemmert <mark.lemmert@gmail.com> - 2015-12-02 14:05 -0800
  Re: Plotting Text Characters on Hi-Res Graphics Screen michael.pohoreski@gmail.com - 2016-01-09 13:41 -0800
    Re: Plotting Text Characters on Hi-Res Graphics Screen michael.pohoreski@gmail.com - 2016-01-09 18:28 -0800
      Re: Plotting Text Characters on Hi-Res Graphics Screen Hugh Hood <hughhood@earthlink.net> - 2016-01-10 10:31 -0600
        Re: Plotting Text Characters on Hi-Res Graphics Screen michael.pohoreski@gmail.com - 2016-01-10 10:09 -0800
        Re: Plotting Text Characters on Hi-Res Graphics Screen michael.pohoreski@gmail.com - 2016-01-10 21:57 -0800
          Re: Plotting Text Characters on Hi-Res Graphics Screen Kevin Dady <osgeld@cheesefactory.us> - 2016-01-11 06:34 -0800
            Re: Plotting Text Characters on Hi-Res Graphics Screen michael.pohoreski@gmail.com - 2016-01-16 07:25 -0800
              Re: Plotting Text Characters on Hi-Res Graphics Screen Michael J. Mahon <mjmahon@aol.com> - 2016-01-16 11:24 -0600
              Re: Plotting Text Characters on Hi-Res Graphics Screen mmphosis <mmphosis@macgui.com> - 2016-01-17 17:54 +0000
                Re: Plotting Text Characters on Hi-Res Graphics Screen michael.pohoreski@gmail.com - 2016-01-18 09:45 -0800
          Re: Plotting Text Characters on Hi-Res Graphics Screen Hugh Hood <hughhood@earthlink.net> - 2016-01-11 23:01 -0600
            Re: Plotting Text Characters on Hi-Res Graphics Screen michael.pohoreski@gmail.com - 2016-01-12 18:57 -0800
  Re: Plotting Text Characters on Hi-Res Graphics Screen michael.pohoreski@gmail.com - 2016-01-15 14:08 -0800

csiph-web