29 Oct
2010
29 Oct
'10
7:08 p.m.
Hi,
I am on the lookout for a monitor something similar to a Phillips
cm3388 does anyone near London have one they would like to sell or
trade, or know of anywhere I could get one.
Thanks
Dan
29 Oct
29 Oct
7:18 p.m.
On 30/10/10 03:08, Dan Williams wrote:
I am on the lookout for a monitor something similar to
a Phillips
cm3388 does anyone near London have one they would like to sell or
trade, or know of anywhere I could get one.
Surely you mean the CM8833?
Those were fairly extensively re-badged -- Acorn, for instance, sold a
variant of the CM8833 Mk.II as the AKF17.
The Microvitec Cub series might also be worth a look -- these take
either TTL or analogue RGB plus composite sync on a DIN plug, and are
commonly used with BBC Micros.
You should be able to snag either of these for ?10 to ?20, but you might
end up re-homing its associated machine too (the AKF17 was typically
paired with the A3000 computer and some of the later Archimedes series
machines; A3000s aren't really much bigger than a PC keyboard)
--
Phil.
classiccmp at philpem.me.uk
http://www.philpem.me.uk/
30 Oct
30 Oct
1:48 p.m.
On 30/10/10 03:08, Dan Williams wrote:
Is CM8833 a TTL-input monitor? I think it was available as an option,
but most of them take analogue RGB on the SCART socket.
Most of the time the SCART inputs, for all they're supposed to be 1V will
stand TTL (the CM8833 ones certainly will). Or since they're terminated
to ground through a 75 ohm resistor, connect a 300 Ohm (or so) resistor
in series with each TTL signal. Done that many times :-)
Is there any reason a TV with a SCART socket isn't suitable? Most, if not
all, LCD and plasma TVs should haev RGB inputs on the SCART socket, for
example.
-tony
I am on the lookout for a monitor something
similar to a Phillips
cm3388 does anyone near London have one they would like to sell or
trade, or know of anywhere I could get one.
Surely you mean the CM8833?
Those were fairly extensively re-badged -- Acorn, for instance, sold a=20
variant of the CM8833 Mk.II as the AKF17. 
31 Oct
31 Oct
11:15 a.m.
Tony Duell wrote:
Ah... My Acorn-badges Philips monitor just has the SCART socket. The PCB
is layed out for the DIN socket and asociated componets, but they're not
fitted.
I assumeed (probably wrongly) that some Philips-badged ones were
analogue-only too.
H0wever, it's not hard to feed TTL video int othe SCART socket with a few
series resistors ;-))
What does the OP (Liam?) want to use the monuitor with?
-tony
Is CM8833 a TTL-input monitor?
I think so; there's an 8-pin DIN socket on mine that takes RGB
video at TTL levels. Works directly from, say, a BBC Micro. It
also has a SCART socket for analog RGB and composite.
4:02 p.m.
On 31 October 2010 18:15, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
I wanted something I can use on a few machines, mainly I wanted some
Colour on a RM Nimbus, but should work ok on the 480Z as well
Dan
Tony Duell wrote:
Ah... My Acorn-badges Philips monitor just has the SCART socket. The PCB
is layed out for the DIN socket and asociated componets, but they're not
fitted.
I assumeed (probably wrongly) that some Philips-badged ones were
analogue-only too.
H0wever, it's not hard to feed TTL video int othe SCART socket with a few
series resistors ;-))
What does the OP (Liam?) want to use the monuitor with?
-tony
Is ?CM8833 a TTL-input monitor?
I think so; there's an 8-pin DIN socket on mine that takes RGB
video at TTL levels. Works directly from, say, a BBC Micro. It
also has a SCART socket for analog RGB and composite.
1 Nov
1 Nov
12:43 p.m.
I wanted something I can use on a few machines, mainly
I wanted some
Colour on a RM Nimbus, but should work ok on the 480Z as well
I can't find my 480Z technical manual. The 380Z has _analogue_ RGB ouputs
(8 bit colour value split into 2,3,3 bits for the 3 colour 'DACs').
But anyway, there are basically 3 things you need to get right when
connecting up a monitor :
1) the scan rates, particularly the horizontal scan rate. Modifying the
vertical deflection system for a different rate is not too hard given a
scheamtic of the monitor, modifying the horizontal one is. Note that UK
and US TV rates are sufficiently close that they are compatible.
2) The colour signals. Going from TTL to analogue is easy (particualrly
if you only have 3 TTL signals, RGB, to deal with). Going the other way
is a harder. Of course you may find machines that output composite colour
video (many home computers) or separate luminance and chrominance (like
S-video, some Commodore machines)
3) The syncs [1]. This hasn't been mentioned yet. Some systems use separate
syncs, some compoiste sync. To go from separate syncs to composite sync
is easy in general. Just XOR the signals together. Separating syncs is a
little harder, the LM1881 or it's more modern variants work well. But
before doing that, if possible look at the scheamtics of the monitor.
I've met a fair number of mobnitors with 'separate sync' inputs where the
inputs are XORed (or similar) inside the monitor, then separated again.
If that's the case you can feed composite sync into one input and ground
the other one/. Sometimes you have to invert the sync signals, but that's
easy too. Monitors with SCART socket inputs often take composite sync at
a low level on the _composite video input_ pin of the SCART socket. But
I've yet to meet one that objects to TTL being fed in here.
[1] 'If you ahve sync problems, the picture swims about. Hence the
expression "sync or swim"' No, I can't remember where I got that
from...
-tony
31 Oct
31 Oct
4:02 a.m.
ard at p850ug1.demon.co.uk (Tony Duell) writes:
Is CM8833 a TTL-input monitor?
It depends -- there were lots of variants of the 8833 with different
input options. I've owned three: a Philips-branded one that has analogue
RGB on a DE9, a Commodore 1084S which has separate DINs for analogue and
TTL RGB, and the Acorn equivalent which has a SCART connector.
The 1084S at least is perfectly happy to accept TTL RGB on its analogue
RGB input, as you suggest; I use mine that way with my BBC Micros
(having made up the cable when I didn't have the right DIN plug for the
TTL input!). They're really nice monitors, aside from the tendency of
the flap covering the controls to fall off and get lost. The 1084S
seemed quite expensive in 1990, but given that it's still in regular use
20 years later, I'm not going to complain. ;-)
What I'd really like is a nice big old broadcast-quality RGB monitor to
use with classic computers and laserdisc/video, but I'm not too hopeful
about one coming up locally (Dundee), and I wouldn't want to ship one...
--
Adam Sampson <ats at offog.org> <http://offog.org/>
4:15 a.m.
The 1084S at least is perfectly happy to accept TTL
RGB on its analogue
RGB input, as you suggest; I use mine that way with my BBC Micros
(having made up the cable when I didn't have the right DIN plug for the
TTL input!). They're really nice monitors, aside from the tendency of
See here: :oD
http://tabalabs.com.br/eletronica/gambiarras/20.jpg
:o)
(root page: http://tabalabs.com.br/eletronica/gambiarras/)
11:34 a.m.
ard at p850ug1.demon.co.uk (Tony Duell) writes:
That's what I thought. I beleive there was also a version with a built-in
PAL decoder (composite colour video input),
As an aside, therw was a PAL-input (internal decoder) version of the
Microvitec Cub too.
Is CM8833 a TTL-input monitor?
It depends -- there were lots of variants of the 8833 with different
input options. I've owned three: a Philips-branded one that has analogue
RGB on a DE9, a Commodore 1084S which has separate DINs for analogue and
TTL RGB, and the Acorn equivalent which has a SCART connector.
The 1084S at least is perfectly happy to accept TTL RGB on its analogue
RGB input, as you suggest; I use mine that way with my BBC Micros
Indeed. I normally put a 300 ohm resisotr in series with each TTL signal,
given the 75 ohm terminatiuons,that brings 5V signalsdown to 1V.
(having made up the cable when I didn't have the
right DIN plug for the
TTL input!). They're really nice monitors, aside from the tendency of
Not for this model of monitor, but once when I didn't have the right plug
to hand, I pulled the case and temporarily soldered the wires straight to
th PCB.
the flap covering the controls to fall off and get
lost. The 1084S
seemed quite expensive in 1990, but given that it's still in regular use
20 years later, I'm not going to complain. ;-)
Actuially I think mine has a vertical deflection fault at the moment
(I've not used it for soem time). I have the schematics, it can't be hard
to sort out.
What I'd really like is a nice big old broadcast-quality RGB monitor to
use with classic computers and laserdisc/video, but I'm not too hopeful
about one coming up locally (Dundee), and I wouldn't want to ship one...
You're not gettign mine :-). I have an old (delta gun CRT...) Barco
complete with the 'user manual'. That manual has one page telling you how
to use the brightness and gain (contrast) controls, a couple of pages
explaining how to mount it in a rack, and lots of pages of scheamatics,
alightment data, waveforms, etc. Amd yes the manual does make reference
to 'studio use'.
Analogue RGB inputs on BNC sockets, of course.
-tony
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10 comments
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participants (6)
-
ard＠p850ug1.demon.co.uk -
ats＠offog.org -
classiccmp＠philpem.me.uk -
coredump＠gifford.co.uk -
pu1bzz.listas＠gmail.com -
williams.dan＠gmail.com