Re: Laser 128 to CGA is easy

[aguilar@onixinformatica.com.br (Jose Carlos Lord Apple)]

"Joel" <joelbuckley54.nospam.@hotmail.com> wrote in message news:<p9GdnRKsNadtPVegXTWcqA@comcast.com>...
> "Jose Carlos Lord Apple" <aguilar@onixinformatica.com.br> wrote in message
> f57a920b.0211070305.5fe2a4dd@posting.google.com">news:f57a920b.0211070305.5fe2a4dd@posting.google.com...
> > "Joel" <joelbuckley54.nospam.@hotmail.com> wrote in message
>  news:<6LSdnflH4-4MDVSgXTWcow@comcast.com>...
> > > While the Laser 128 has a 15 pin video port, it is rather different from
>  the
> > > 15 pin video port on a //c.
> > > Unlike the //c, it contains all the signals (R,G,B,I,VSync,HSync) you
>  need
> > > to drive a CGA color monitor.
> > > Laser sold simple 15 to 9 pin adapters to do just that.
> > > I have 2 or 3 in my basement.
> > > That and the built-in parallel printer port were real improvements over
> > > Apple's design.
> >
> > I have a Mono CGA monitor (Samsung). It has a DB9 connector only with
> > the pins:
> > - Ground
> > - Intensity (I)
> > - VSync
> > - HSync
> > - Reserved (?)
> >
> > I did a DB15 to DB9 cable (I have the Laser DB15 pin documentation)
> > with this signals. But it doesn't work !!!! I read that the CGA isn't
> > an analog RGB, so, it doesn't work. Do you know how can I do this work
> > ?
> >
> > Thanks,
> >
> > Jose Carlos
> > Brazil
> >
> > I,VSync,HSync
> 
> Jose,
> see my post on RGB and the Apple ii
> 
> I suspect you don't actually have a mono RGB monitor.
> While some may think that's a contradiction in terms (black and white color
> monitor), they do exist-I have one.
> It takes RGBI input and makes it greyscale.
> Your don't have the pin #'s listed on your connector.
> But an RGB mono needs to have the Red, Green and Blue signals.
> If the one you have labeled Reserved is pin 7, then you actually have a
> common MDA or monochrome TTL monitor.
> This signal is for monochrome digital video input.
> Also, this monitor runs at 50hz/18khz not 60 hz/15Khz that CGA does.
> It's conceivable that such a monitor might be able to lock onto the CGA sync
> signals.
> But you have to run something into the video input.
> For a test, just run the Green signal (Laser pin 15)
> It should enable you to see text.
> But trying to display the Apples 15 colors on a digital mono monitor (which
> has effectively 3 colors black, white, and bright white)  doesn't work.
> Actual mono CGA monitors convert the 16 RGBI combinations into 16 grey
> levels.
> Joel

Yes, the reserved is the pin 7 !!!! I sent you a private message.
Thanks Joel,

Jose Carlos
Brazil