[Coco] CoHR doesn't support cursor position

[Gene Heskett]

On Monday 03 February 2014 13:22:07 Ken H. did opine:

> Hi,
> The CoHR level1 51 column driver source has full support for escape
> characters (GotoXY, cursor positions, underline on/off, reverse on/off
> etc). For example   DISPLAY 1B 41 X Y  - move  cursor to position
> X(0-50), Y(0-23).
> 
> But this escape code feature has been broken in NitrOS9 for a long time
> (did it ever work?)
> 
> I have investigated this problem, and the bug is actually is the VTIO
> module.
> VTIO does not pass the 1B escape code to CoHR, and instead generates a
> 246 (Not Ready) error.
> 
> The following 4 line patch to VTIO provides a fix for this problem.
> 
> Write    ldb   <V.NGChr,u are we in the process of getting parameters?
>             bne   PrmHandl   yes, go process
>             sta   <V.WrChr,u save character to write
>             ldb   V.51EscSeq,u                                      **<<
> ADD: In Escape sequence?
>            bcc   GoCo
> **<< ADD: Yes, send to COHR
>            cmpa  #C$SPAC    space or higher?
>            bcc   GoCo       yes, normal write
>           cmpa  #$1B                                                  
> **<< ADD: COHR Escape Code?
>           bcc   GoCo
> **<< ADD: Yes, send to COHR
>           cmpa  #$1E       escape sequence $1E or $1F?
> 
> 
> The nice thing about this fix is that we can finally run Dynacalc in 51
> columns mode on a level 1 CoCo.
> 
> The CoHR escape codes are based on the Dragon's GO51 display functions.
> Therefore, Tandy's version of Dynacalc will not work, but the Dragon
> version of Dynacalc (
> http://archive.worldofdragon.org/archive/index.php?dir=Disks/Dragon/&fil
> e=Dragon%20Data%20Ltd%20-%20OS-9%20Dynacalc.zip) works fine also on the
> CoCo.
> 
> Even better, the STYLOGRAPH word processor (also on the dragon archive)
> also finally works with this patch!
> AFAIK, Stylograph (arguably the best wp for OS9), isn't otherwise
> available for the CoCo.
> 
> You do need a stripped down build of NitrOS9 to have enough free memory
> to run these programs.  I was able to run them with a minimal boot disk
> with 129 pages free.
> 
> As far as I could tell this fix doesn't break anything else, but before
> we commit this change maybe someone else can test it out?
> 
> Cheers,
> Ken

I'd love to test it, but my back has reached the point where I have got to 
let somebody make magic marker lines on it to open it up and fix a crushed 
disk.

So please hop to it folks, this is exactly the sort of bug fixes we need to 
be doing that have been quite long duration gotcha's.

> 
> 
> 
> On Mon, Apr 15, 2013 at 8:41 PM, Luis Antoniosi (CoCoDemus) <
> 
> retrocanada76 at gmail.com> wrote:
> > Hi,
> > 
> > Why CoHR doesn't support home, cursors position and other terminal
> > commands ? The only supported feature seem to be the the clear
> > screen.
> > 
> > It wouldn't be hard to implement them but I ask why it wasn't made
> > before ? This kills completely its utility as no screen based program
> > will ever run on it. I can't think why people would use CoHR if
> > dynacalc doesn't run on it.
> > 
> > Also, for CoVDG, it doesn't support line delete and insert 1F 30 and
> > 1F 31. We could make better applications for them if they were all
> > supported.
> > 
> > I think that I going to patch them :)
> > 
> > Felipe.
> > 
> > --
> > Long live the CoCo
> > 
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco
> 
> --
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> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco


Cheers, Gene
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