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I want to flip a composite signal...

J

James Sweet

Jan 1, 1970
0
Thanks for the pointer on MAME. I'm allready using it that way, but it
would be nice to be able to do everything without having to look at it
sideways.. I can already play games oriented properly, but using dos is a
bit of a challenge at times.
I kind of guessed that it wouldn't work because of the scan rate
differences between the two, horizontal being in the kilohertz range and
vertical just being around 60 hertz or so.


Just get a flippable monitor. There were a few CRTs like that, and many LCDs
are available which simply swivel 90 degrees. I haven't used the DOS version
of MAME in over a decade, the Windows version has the same functionality.
 
M

Michael A. Terrell

Jan 1, 1970
0
James said:
It makes no difference whether it's B&W or color. I've done a lot of service
work on arcade game monitors, and it's common to have to flip yoke plugs.
Some games mount vertical monitors on one side, some on the other side, some
horizontal monitors are mounted upside down, there's really no standard.
Flip the wires and the picture flips, that's all there is to it. One place I
worked I used to swap the yoke wires in people's tvs as a prank.


My work with color monitors were the older tri-dot CRTs and the
convergence went to hell when you reversed the scan.

I had a set of switches on the back of a B&W TV in my bedroom when i
was in Jr. High School. I could flip both the vertical and horizontal
scan. :)

Many small LCD monitors have a switch to toggle mirroring.


The only LCD monitors I've used were in laptops. They give me
headaches, so I try to avoid them.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
J

James Sweet

Jan 1, 1970
0
My work with color monitors were the older tri-dot CRTs and the
convergence went to hell when you reversed the scan.


Yeah dynamic convergence will have issues, but I'm not old enough to have
ever dealt with one of those. Everything was inline gun static convergence
for as long as I can remember.
 
M

Michael Kennedy

Jan 1, 1970
0
James Sweet said:
Just get a flippable monitor. There were a few CRTs like that, and many
LCDs are available which simply swivel 90 degrees. I haven't used the DOS
version of MAME in over a decade, the Windows version has the same
functionality.

Well on my desktop PC I use a windows version, but I don't use MAME much on
my destop. I have a MAME cabinet and I use dos because of lack of CPU power
and convience of booting stright to the game. It primarly runs Ms PacMan
since it is a Ms PacMan coctail table. It was quite a project, I built it
from scratch and it came out rather nice looking. I set it up with a
Joystick on each side and two buttons on each side. The hdd is dead right
now. I really need get off my butt and fix it. .

Mike

Mike

Mike
 
A

Arfa Daily

Jan 1, 1970
0
James Sweet said:
Yeah dynamic convergence will have issues, but I'm not old enough to have
ever dealt with one of those. Everything was inline gun static convergence
for as long as I can remember.

Ha!! Dynamic convergence was soooooo much fun ! It was another of those
things that was more 'art' than science. You either had it, or you didn't. I
worked with guys that were twice and three times my age back then, who had
endless years of experience in TV repair, and could not converge a tri-dot
shadowmask CRT - or set up its purity rings - to save their lives. Having
replaced a CRT, I could set them up as perfectly as they would go in little
more than 5 minutes. Anybody remember the special surface-silvered mirrors
that we had for setting the static convergence with the four magnets on the
CRT neck ? We had one that was constructed into a wooden frame with 'arms'
on it. It lay across the top of the cabinet, and hooked at the back under
the cabinet top. The mirror section then hung down in front of the screen,
and as it was surface-silvered, you didn't get any distortion in the image
due to glass thickness. Happy days ...

Arfa
 
M

Michael A. Terrell

Jan 1, 1970
0
Arfa said:
Ha!! Dynamic convergence was soooooo much fun ! It was another of those
things that was more 'art' than science. You either had it, or you didn't. I
worked with guys that were twice and three times my age back then, who had
endless years of experience in TV repair, and could not converge a tri-dot
shadowmask CRT - or set up its purity rings - to save their lives. Having
replaced a CRT, I could set them up as perfectly as they would go in little
more than 5 minutes.


I saw an older tech replace a 21JP22 round color CRT. (Over 40 years
ago.) He forgot to take the safety glass off the old tube. he had the
new tube in and convereged when he discovered that the dud didn't fit
back into the carton. So, he had to remove the yokes and CRT, install
the glass, and new CRT. When he fired the set up again, it had perfect
purity and convergence. Man was he upset. He kept complaining that it
was impossible, and was waiting for something to blow up. ;-)

BTW, I learned a lot from Dave, in that after school, part time job.


? Anybody remember the special surface-silvered mirrors
that we had for setting the static convergence with the four magnets on the
CRT neck ? We had one that was constructed into a wooden frame with 'arms'
on it. It lay across the top of the cabinet, and hooked at the back under
the cabinet top. The mirror section then hung down in front of the screen,
and as it was surface-silvered, you didn't get any distortion in the image
due to glass thickness. Happy days ...


We used real glass mirrors like this: See the bracket on the back?
That is where it slipped onto the folding stand.

Front view:

<http://www.mcminone.com/_goProduct.asp?product_id=21-1180>

Back View:

<http://cgi.ebay.com/Mirror-GC-Elect...ZWD1VQQ_trksidZp1638.m118.l1247QQcmdZViewItem>

here is the folding stand:

<http://www.mcminone.com/product.asp?catalog_name=MCMProducts&product_id=21-1210>


Talk about a price increase! That's about $100, and it used to be about
$10. :(


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
A

Arfa Daily

Jan 1, 1970
0
Michael A. Terrell said:
I saw an older tech replace a 21JP22 round color CRT. (Over 40 years
ago.) He forgot to take the safety glass off the old tube. he had the
new tube in and convereged when he discovered that the dud didn't fit
back into the carton. So, he had to remove the yokes and CRT, install
the glass, and new CRT. When he fired the set up again, it had perfect
purity and convergence. Man was he upset. He kept complaining that it
was impossible, and was waiting for something to blow up. ;-)

BTW, I learned a lot from Dave, in that after school, part time job.


? Anybody remember the special surface-silvered mirrors


We used real glass mirrors like this: See the bracket on the back?
That is where it slipped onto the folding stand.

Front view:

<http://www.mcminone.com/_goProduct.asp?product_id=21-1180>

Back View:

<http://cgi.ebay.com/Mirror-GC-Elect...ZWD1VQQ_trksidZp1638.m118.l1247QQcmdZViewItem>

here is the folding stand:

<http://www.mcminone.com/product.asp?catalog_name=MCMProducts&product_id=21-1210>


Talk about a price increase! That's about $100, and it used to be about
$10. :(
That's sweet. As I recall, the one we had came from one of the UK set
manufacturers - possibly Rank Bush Murphy or RBM as they liked to be known.
It was professionally made. All wood and sprayed grey. It had several
wing-nutted 'joints' that could be adjusted to get just the view you needed.
In the workshop, we had mirrors mounted on the back of each bench.

Arfa
 
M

Michael A. Terrell

Jan 1, 1970
0
Arfa said:
That's sweet. As I recall, the one we had came from one of the UK set
manufacturers - possibly Rank Bush Murphy or RBM as they liked to be known.
It was professionally made. All wood and sprayed grey. It had several
wing-nutted 'joints' that could be adjusted to get just the view you needed.
In the workshop, we had mirrors mounted on the back of each bench.


That GC mirror and folding stand would fit into the bottom of a large
tube caddy, so you didn't have to carry it separately, or make another
trip to your truck. We carried them in the main caddy, with the most
popular tubes. two other caddies carried the other TV tubes, and a
couple of the trucks in or company carried all the tubes for all the
Public Address equipment we serviced.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
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