Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.sys.apple2.programmer > #745 > unrolled thread

Get character at position in 80-column mode

Back to article view | Back to comp.sys.apple2.programmer

Contents

  Get character at position in 80-column mode krussell.co@gmail.com - 2013-07-15 10:59 -0700
    Re: Get character at position in 80-column mode D Finnigan <dog_cow@macgui.com> - 2013-07-15 21:32 +0000
      Re: Get character at position in 80-column mode BLuRry <brendan.robert@gmail.com> - 2013-07-15 17:43 -0700

#745 — Get character at position in 80-column mode

Hi there,

There was a post here about getting a character at a given position on the screen in 40-column mode using SCRN.  How can I get a character at a given position in 80-column mode?  I can find nothing about this anywhere.

I'm programming in Applesoft BASIC.

Thanks for any help!

[toc] | [next] | [standalone]

#747

krussell.co wrote:
> Hi there,
> 
> There was a post here about getting a character at a given position on the
> screen in 40-column mode using SCRN.  How can I get a character at a given
> position in 80-column mode?  I can find nothing about this anywhere.

On page 188 of The New Apple II User's Guide:

"one may use PEEK(36) to find the current cursor column. Likewise, to find
the current cursor row, use PEEK(37). It will return a number between 0 and
23, representing top and bottom of the screen, respectively."

Works in 40 and 80 columns.

-- 
]DF$
Apple II Book: http://macgui.com/newa2guide/
Usenet: http://macgui.com/usenet/  <-- get posts by email!
Apple II Web & Blog hosting: http://a2hq.com/

[toc] | [prev] | [next] | [standalone]

#750

On Monday, July 15, 2013 4:32:43 PM UTC-5, D Finnigan wrote:
> krussell.co wrote:
> 
> > Hi there,
> 
> > 
> 
> > There was a post here about getting a character at a given position on the
> 
> > screen in 40-column mode using SCRN.  How can I get a character at a given
> 
> > position in 80-column mode?  I can find nothing about this anywhere.
> 
> 
> 
> On page 188 of The New Apple II User's Guide:
> 
> 
> 
> "one may use PEEK(36) to find the current cursor column. Likewise, to find
> 
> the current cursor row, use PEEK(37). It will return a number between 0 and
> 
> 23, representing top and bottom of the screen, respectively."
> 
> 
> 
> Works in 40 and 80 columns.
> 
> 
> 
> -- 
> 
> ]DF$
> 
> Apple II Book: http://macgui.com/newa2guide/
> 
> Usenet: http://macgui.com/usenet/  <-- get posts by email!
> 
> Apple II Web & Blog hosting: http://a2hq.com/

You can probably make use of the 80STORE and PAGE2 switches to read only the AUX video memory when doing SCRN.  In which case, if int(x/2) = (x/2) then (set up aux) else (set up main).... afterwards use scrn on int(x/2),y and it *should* work as long as the page2/80store switches don't change.

-B

[toc] | [prev] | [standalone]

Back to top | Article view | comp.sys.apple2.programmer

csiph-web