[Coco] CoHR doesn't support cursor position

[Luis Antoniosi (CoCoDemus)]

does minted work fine too ?

On Mon, Feb 3, 2014 at 10:57 AM, Ken H. <dragon.atv at gmail.com> wrote:
> 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/&file=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
>
>
>
>
> 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
>>
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>
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