CM8833-II / CM11342/05G Monitor
Drew
After a bit of help again :-). I managed to pick up a Philips CM8833-
II monitor today and was wondering if i needed to do anything special
to get it to work? I did do a search of the forums but didn't find
anything specific. Looking at the pinouts it would seem I should be
able to use the cable I have for my Commodore 1084s, but when i use it
the picture just rolls i.e not in sync.
The cable I made for the 1084s is cabled as per the faq and i get a
stable picture on my 1084s monitor...though red isnt very good.
The only information i have found on the pinouts for the philips
monitor are:-
1,2 - Ground
3 - Red
4 - Greem
5 - Blue
7 - Status RGB
Any suggestions?
Many thanks
Andrew
Bill Garber
"Drew" <Goggl...@gmail.com> wrote in message news:39477d05-4562-4aef...@x16g2000prn.googlegroups.com...
Try this:
Philips CM8833-II has quite similar specs to
the monitor above (used in the same type of
applications). Philips CM8833-II has a RGB
connector which can accept both analogue and
digital RGB signal. The RGB connector uses
the following pinout:
_____________
\ 5 4 3 2 1 /
\_9_8_7_6_/
-Pin- -RGB TTL- -RGB Analogue-
1 Ground Ground
2 Ground Ground
3 Red Red
4 Green Green
5 Blue Blue
6 Intensity Fast Blanking
7 Not used Composite Sync
8 H. Sync H. Sync
9 V. Sync V. Sync
Some of the CM8833-II models have also a separate
composite video input (RCA connector). I have also
heard of special versions with only the digital TTL
RGB input.
Bill Garber from GS-Electronics
http://www.garberstreet.com
"If you wish to forget anything on the spot, make a note
that this thing is to be remembered." (Edgar Allen Poe)
Polymorph
It may be like the 1084S monitor that I have hooked up to my daughters
IIgs in that it requires a small value resistor between composite
synch and ground.
I refer you to the relevent thread here:
http://groups.google.com.au/group/comp.sys.apple2/browse_frm/thread/7a9c31b72c99fa88/cca240bd370259fc?lnk=gst&q=1084S#cca240bd370259fc
Have a read through that and see if it sounds familiar. The solution
presented within that thread did fix the problem for me - the monitor
in question has now been in use for nearly a year.
If you get stuck or need pics of what I did, let me know and I'll see
what I can do.
Cheers,
Mike
Drew
> On Nov 14, 11:38 am, Drew <GoggleD...@gmail.com> wrote:
>
>
>
> > Hi,
>
> > After a bit of help again :-). I managed to pick up a Philips CM8833-
> > II monitor today and was wondering if i needed to do anything special
> > to get it to work? I did do a search of the forums but didn't find
> > anything specific. Looking at the pinouts it would seem I should be
> > able to use the cable I have for my Commodore 1084s, but when i use it
> > the picture just rolls i.e not in sync.
>
> > The cable I made for the 1084s is cabled as per the faq and i get a
> > stable picture on my 1084s monitor...though red isnt very good.
>
> > The only information i have found on the pinouts for the philips
> > monitor are:-
>
> > 1,2 - Ground
> > 3 - Red
> > 4 - Greem
> > 5 - Blue
> > 7 - Status RGB
>
> > Any suggestions?
>
> > Many thanks
> > Andrew
>
> It may be like the 1084S monitor that I have hooked up to my daughters
> IIgs in that it requires a small value resistor between composite
> synch and ground.
>
>
> Have a read through that and see if it sounds familiar. The solution
> presented within that thread did fix the problem for me - the monitor
> in question has now been in use for nearly a year.
>
> If you get stuck or need pics of what I did, let me know and I'll see
> what I can do.
>
> Cheers,
> Mike
Hi Thanks for the comments guys. I don't have a resistor to hand, but
will try some of the comments about connecting the composite sync to H
and V sync and possibly try sync on green.
Cheers
Andrew
Drew
Hi,
Well i got the monitor to sync putting the composite sync onto pin 2.
Though was a bit disappointed with the picture as wasn't as clear/good
as the 1084s-d2 monitor I have (well ignoreing the weak red
colour ;-)). Had thought they were based on similar tubes....getting a
nice collection of monitors though ;-)
Drew
Michael J. Mahon
It's almost certainly not the tube, but the adjustments or the
internal "matrix" resistors used to set the color mixes.
The issue of clarity or resolution is another matter. That can be
limited by the dot pitch of the tube, by the bandwidth of the video
amplifiers, or by focus adjustments.
-michael
******** Note new website URL ********
NadaNet and AppleCrate II for Apple II parallel computing!
Home page: http://home.comcast.net/~mjmahon/
"The wastebasket is our most important design
tool--and it's seriously underused."
Drew
Thanks for the info. The monitor is a 14 inch screen where the 1084s-
d2 is a 13 inch so the dot pitch could make it look slightly worse
picture. Interestingly the CM8833-ii monitor will sync on Pin2
(Ground), and Pins 8 and 9 (V and H Sync) and also pin 7 using the
composite sync from the GS.
Thanks
Andrew
Michael J. Mahon
Actually, making the physical screen bigger at the same dot pitch
will *improve* the number of physical phosphor dots per line.
But making a low-resolution picture bigger just makes it look worse,
regardless of the technology of the display.
If you want to look at Apple II-generated graphics on a large-screen
monitor, you will be dissatisfied unless you back up until the large
display subtends about the same visual angle as a 12"-13" display
right behind the computer.
> Interestingly the CM8833-ii monitor will sync on Pin2
> (Ground), and Pins 8 and 9 (V and H Sync) and also pin 7 using the
> composite sync from the GS.
So, evidently, pin 2 is not ground! Many monitors that can handle
composite sync will actually use it in place of V and H--I'm glad that
your's is one of them.
You may find that the different inputs will have different stabilities
depending on the level of the composite sync signal that is presented.
A simple resistive attenuator (variable is easiest to play with) would
allow you to explore these possibilities if it's still not stable.
The other major issue is sync polarity. Some monitors want positive
sync pulses, while the more common choice is negative. For these cases,
an inverter is required (one chip or even one transistor).