RGB monitor on a IIc+
Supertimer
Charles Stephens <dev...@dobbs.eng.sun.com> wrote:
>I have recently acquired a IIc+ and I wanted to see if it would work
>with my IIgs's RGB monitor. However, the IIc+ will not function until I
>remove the RGB monitor cable and plug in the composite monitor instead.
>Is there some magic to get the RGB mointor to work?
Sure, see http://www.allelec.com/ the vender Alltech Electronics to
look for the Video 7 converter boxes. There are two types of Video 7
boxes, one analog and one digital. You want to get the analog one...
Alltech supports Mac and Wintel besides Apple II, so be sure to click
yourself into the Apple II area before you look for the video box!
BabarStCyr
In article <353C3B75...@dobbs.eng.sun.com>, Charles Stephens
<dev...@dobbs.eng.sun.com> writes:
> However, the IIc+ will not function until I
>remove the RGB monitor cable and plug in the composite monitor instead.
Normal since pluging a RGB monitor cable for 2GS in the DB15 of the 2c
short-circuit 2c power supply !!! Yes yes I also tried this stupidity ;-)
Babar
Babar de Saint Cyr (France)
LCD Apple 2c, WorkStation Apple2e, AppleTalkized IWLQ, 11.25 Mhz TWGS, etc...
;-)
Charles Stephens
>>>>> "BSC" == BabarStCyr <babar...@aol.com> writes:
BSC> In article <353C3B75...@dobbs.eng.sun.com>, Charles Stephens
BSC> <dev...@dobbs.eng.sun.com> writes:
>> However, the IIc+ will not function until I
>> remove the RGB monitor cable and plug in the composite monitor instead.
BSC> Normal since pluging a RGB monitor cable for 2GS in the DB15 of the 2c
BSC> short-circuit 2c power supply !!! Yes yes I also tried this stupidity ;-)
No one told me that the IIc+ video was digital not analog. Oops.
cfs
--
Charles F. Stephens = cfs AT eng.sun.com
Software Psychic and Illuminary =
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Menlo Park, California, USA =
Supertimer
Charles Stephens <dev...@dobbs.eng.sun.com> wrote:
(Referring to the Video Expansion Port of the IIc+)
>No one told me that the IIc+ video was digital not analog. Oops.
That port is not outputting a digital RGB signal. It is outputting
NO RGB signal. It is outputing the signals needed to put
together an RGB image, but you need an adapter to generate
the actual signal. The vender http://www.allelec.com/ Alltech
Electronics sells the Video 7 RGB converters...boxes that plug
into the port and output RGB signals. There are two models.
One outputs digital RGB (for CGA monitors) and one outputs
analog RGB (for Apple IIGS, Amiga, or Atari ST monitors).
stephen e buggie
Will teh RGB converter for IIC PLUS also work with IIC?
CGA --- that means IBM style color monitors? With the adaptor, which
version gives the sharpest picture: CGA or RGB (IIgs monitor type)?
Also, what are the prices of the CGA version vs. RGB version??
Is there an RGB adaptor that will run a CGA monitor on a IIe? I use a IIe
at the college; my college can provide an IBM-style color monitor if I ask
for it.
Steve Buggie
: That port is not outputting a digital RGB signal. It is outputting
: NO RGB signal. It is outputing the signals needed to put
: together an RGB image, but you need an adapter to generate
: the actual signal. The vender http://www.allelec.com/ Alltech
: Electronics sells the Video 7 RGB converters...boxes that plug
: into the port and output RGB signals. There are two models.
: One outputs digital RGB (for CGA monitors) and one outputs
: analog RGB (for Apple IIGS, Amiga, or Atari ST monitors).
Stephen Buggie Univ. of New Mexico Gallup NM 87301 bug...@unm.edu
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Stephen Buggie Gallup New Mexico bug...@unm.edu
_________________________Oooo.__________________________________
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Mitchell Spector
In article bug...@pegasus.unm.edu (stephen e buggie) writes...
>Will teh RGB converter for IIC PLUS also work with IIC?
Absolutely, the Video Expansion Port on the Apple IIc Plus
is identical to the one on the original Apple IIc. There is no
difference between them.
>CGA --- that means IBM style color monitors? With the adaptor, which
>version gives the sharpest picture: CGA or RGB (IIgs monitor type)?
CGA monitors used digital RGB (which has a limit of displaying
64 colors) whereas the AppleColor RGB used analog RGB (which can
display an unlimited amount of colors). That is irrelevant on a
machine such as the Apple IIc, which can display only a maximum
of 16 fixed colors.
As to which one is sharper, that would depend on the quality
of picture tube and dot-pitch. In general, the AppleColor RGB is
much sharper and clearer than most of the old CGA/EGA monitors
I've seen over the years. I may be mistaken, but I don't believe
analog RGB has any image advantage over digital RGB (color aside).
>Also, what are the prices of the CGA version vs. RGB version??
You seem to be confusing the terms "CGA" and "RGB". The term
CGA stands for Color Graphics Adapter, a video standard used by
the IBM in the early 80's. Monitors that worked with this type of
video (NTSC frequency, digital RGB) were called TTL, CGA or EGA
display monitors (EGA is another digital RGB video standard--
short for Enhanced Graphics Adapter).
RGB stands for Red-Green-Blue, which is what how an RGB monitor
works. The color information in the video signal is split into three
independant lines (a red line, blue line and green line; digital RGB
monitors carry a forth line for brightness to display 16 colors, or
6 lines to display 64 colors because lines are either on/off whereas
analog varies the voltage to each line, so it only needs 3 lines).
All you really need to know are digital RGB monitors will work
with the IIc if you have an adapter. As for analog RGB monitors,
you need an adapter which supports them and I'm not sure if that
actually exist (if not, you'll get a picture but the colors will
be wrong and in some cases, missing). Modern day monitors are also
analog RGB, but they use higher frequencies which make them not at
all compatible (avoid SVGA and Mac monitors).
>Is there an RGB adaptor that will run a CGA monitor on a IIe? I use a IIe
>at the college; my college can provide an IBM-style color monitor if I ask
>for it.
Yep, the ColorLink piggyback option for the AE RamWorks card
is one example, another is the Apple Extended 80/RGB card. Both
plug into the auxiliary slot and allow you to drive a digital
RGB monitor (IBM CGA and EGA style monitors, but *not* VGA or
SVGA monitors).
A Second Sight board plugged into the Apple IIe would allow
you to drive a VGA/SVGA monitor, although the board isn't well
enough supported to function in an Apple IIe (it doesn't support
Double-Hi-Res for one thing, and there are no programs that will
run on the IIe and recognize the SS card natively).
Mitchell Spector
sp...@vax2.concordia.ca
Supertimer
sp...@vax2.concordia.ca (Mitchell Spector) wrote:
> As to which one is sharper, that would depend on the quality
>of picture tube and dot-pitch. In general, the AppleColor RGB is
>much sharper and clearer than most of the old CGA/EGA monitors
>I've seen over the years. I may be mistaken, but I don't believe
>analog RGB has any image advantage over digital RGB (color aside).
There are two different versions of the Video 7 RGB interface for
the IIc and IIc Plus. The digital one connects to CGA monitors
and the analog one normally connects to an AppleColor RGB
monitor (the IIGS monitor). The advantage of the analog version
is that the colors look more correct. When you look at the digital
version, the colors don't look like what they are supposed to look
like for games like Airheart...everything is too bold and intense.
The analog version uses the unlimited color selection of analog
RGB to "pick" the correct 16 colors...the output LOOKS more like
the composite output, except sharp enough to display 80 columns
and no color bleed.
David Empson
Mitchell Spector <sp...@vax2.concordia.ca> wrote:
> In article bug...@pegasus.unm.edu (stephen e buggie) writes...
>
> >Will teh RGB converter for IIC PLUS also work with IIC?
>
> Absolutely, the Video Expansion Port on the Apple IIc Plus
> is identical to the one on the original Apple IIc. There is no
> difference between them.
>
> >CGA --- that means IBM style color monitors? With the adaptor, which
> >version gives the sharpest picture: CGA or RGB (IIgs monitor type)?
>
> CGA monitors used digital RGB (which has a limit of displaying
> 64 colors)
Not exactly. Digital RGB has a colour limit which depends on the
interface. In the case of CGA, or Apple's digital RGB (as used on the
Apple /// for example), it is 16 colours.T here are four colour select
lines, each with two states: two to the fourth power is sixteen.
For CGA, the four lines are red, green, blue and intensity. The Apple
digital RGB monitors use a more complex mapping system, with different
colours produced.
EGA supports 64 colours (two lines for each primary colour).
--
David Empson
dem...@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand