XY monitor experts... I have an idea.

[Iron J.]

For the BattleZone cockpit, I would like to make a 25 inch BW XY. I have a 25 med res tube and have the original complete BW XY 19 incher that was originally in the BZ UR that I parted out.

What exactly would I have to look for or do in order to make the 25 inch BW XY ?

http://forums.lymphoma.com/forums.arcade-museum.com/images/ubbgraemlins/confused.gif

[freebeer]

I think that you pick one gun in the tube to use? Somewhere there is information on how to divide Asteroids or AD into a 3 color game on a color XY. I will look for the information.

[mspaeth]

Use the original chassis to make the HV and drive the color guns... hook the Z signal to all 3 color inpurs (might need to buffer it and change the gain/dc levels)...

Swap the vector yoke onto the 25" tube and use it to drive the yoke...

The only real issue is that you won't have any 'spot killer' functionality with that setup (and the HV may not work without a raster yoke attached to the board, depending on how it was designed).

[modessitt]

Use the original chassis to make the HV and drive the color guns... hook the Z signal to all 3 color inpurs (might need to buffer it and change the gain/dc levels)...

Swap the vector yoke onto the 25" tube and use it to drive the yoke...

The only real issue is that you won't have any 'spot killer' functionality with that setup (and the HV may not work without a raster yoke attached to the board, depending on how it was designed).



Mark, wouldn't there be a concern as to whether the 19" flyback can drive a large enough image to fill the 25" tube?

[freebeer]

Oops, didn't mean to pose as an expert. I am just very enthusiastic about XY.

[mspaeth]

Mark, wouldn't there be a concern as to whether the 19" flyback can drive a large enough image to fill the 25" tube?



That's why I told him to use the original chassis/flyback to generate HV.

It's just a matter of current @ voltage...

[pat9000]

If you want to make things a bit easier, you could also try to get your hands on a B/W 23" tube - they're not hard to find. You can basically just hack up the GO5 monitor chassis, swap out the yoke, and plug it right in.

I have an Asteroids that is actually a bootleg conversion kit for Atari Football cabinets, and it uses the original Footbal 23" CRT. The 23" CRT has Asteroids burn-in and is bright as can be so it's apparent it was operated for a long time with no issues..

Atari should have made them this way.

http://i81.photobucket.com/albums/j205/1980b/asteroids_1.jpg

[FullThrottle]

Nice Pat9000, I love that cocktail Asteroids conversion!! You're right, Asteroids should have been made that way!

[modessitt]

http://i81.photobucket.com/albums/j205/1980b/asteroids_1.jpg



What would be cool would be if you somehow hacked a ROM to splice Asteroids with Space Wars and have two separate ships killing Asteroids and UFOs, as well as hunting each other. Talk about some intense head-to-head play!

[Level42]

Use the original chassis to make the HV and drive the color guns... hook the Z signal to all 3 color inpurs (might need to buffer it and change the gain/dc levels)...

Swap the vector yoke onto the 25" tube and use it to drive the yoke...

The only real issue is that you won't have any 'spot killer' functionality with that setup (and the HV may not work without a raster yoke attached to the board, depending on how it was designed).

I see another issue: convergence. If it's not absolutely perfect, you will see color problems in the corners/edges. Convergence problems don't look too bad on f.i. SW because Atari was smart enough to keep the colors simple overall. But with a B/W game, it will be all three colors on everywhere all the time and I doubt it's possible to get the convergence good enough to not see the separate colors in the corners/edges.

Then again.......BZ is green only right, you could use just the green gun of course.

I wouldn't sacrifice a 25" color mid-res tube for that, there are better uses for them. Try to find a B/W tube with that size.

Maybe here: http://www.hawkeyepicturetube.com/

[Mark H]

Pull a 23" tube from an old Atari / Kee game and be done.

mh

[mspaeth]

I wouldn't sacrifice a 25" color mid-res tube for that, there are better uses for them. Try to find a B/W tube with that size.



You definitely want as high of a rez tube as possible for doing a vector game. B&W tubes were much higher effective resolution since there's no shadow mask to inherently split the image into pixels.