Q*Bert Monitor

Braido

Well-known member

Donor 2011
Joined
Jul 17, 2009
Messages
4,811
Reaction score
82
Location
California
Can anyone tell me what the orginal monitor was in the Qberts? Was it horizontal or vertical and what the number is?
 
Monitor

I have 2 of them setting here and they are both vertical frames with 4900 monitors. I am pretty sure one of them is the origional monitor.
 
I have 2 of them setting here and they are both vertical frames with 4900 monitors. I am pretty sure one of them is the origional monitor.

I am having sync problems, do you know anything about qbert sync problems?
 
Yep.....my Q-Bert had a 4900 in it too....
Do you have sync problems with a newer monitor? If so...here might be a solution...it worked for me on my newer monitor.


From: Al Kossow ([email protected])
Subject: trivial QBert sync inversion hack
Newsgroups: rec.games.video.arcade.collecting
Date: 1998/10/13



Joe Britt and I came up with a trivial hack to convert Q*Bert
boards to negative sync, and lets you generate combined H/V
sync as well. It turns out that J14 (a 7407) is only used
as a sync buffer. Replace it with a 7406, which is an inverting
open collector buffer. The sync is then active low, and since
it is open collector, you can 'wire-or' the outputs and get
combined H/V sync.
 
Yep.....my Q-Bert had a 4900 in it too....
Do you have sync problems with a newer monitor? If so...here might be a solution...it worked for me on my newer monitor.


From: Al Kossow ([email protected])
Subject: trivial QBert sync inversion hack
Newsgroups: rec.games.video.arcade.collecting
Date: 1998/10/13



Joe Britt and I came up with a trivial hack to convert Q*Bert
boards to negative sync, and lets you generate combined H/V
sync as well. It turns out that J14 (a 7407) is only used
as a sync buffer. Replace it with a 7406, which is an inverting
open collector buffer. The sync is then active low, and since
it is open collector, you can 'wire-or' the outputs and get
combined H/V sync.

I put a new monitor in the Q*Bert and now i am having sync problems. Nothing too bad but the image does wander a little.
 
I am still having some problems with my Q*Bert monitor syncing up. The monitor i have in my Q*Bert machine is a Orion OC-2012 Vert. Anyone have any ideas? The monitor is brand new.
 
Thanks, i'll give that a shot tomorrow I don't have Qbert at home here, (doing a reno at the house) i'll let you know how i make out.
 
Back
Top Bottom