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Newsgroups: rec.games.video.arcade.collecting
From: c...@supra.com (Clay Cowgill)
Date: 1997/01/15
Subject: Re: Tech: Major Havoc adapter board.
In article <32DA9A24.3...@magenta.com>, j...@magenta.com wrote: Nope. Well put. ;-) I'm not sure if the Ampliphone has the correction in > Second, to correct the X-deflection output. Space Duel, Gravitar and > Tempest all used Wells-Gardner > monitors, while the dedicated Major Havoc game used the amplifone. Im > not sure of the exact reason > but the Wells-Gardner monitors have a pincusion effect on a linear > input. Because of this there was > corrective circuitry on the game PCB's of SD,G and T. These are > analog multipliers that correct for > this non-linearity. Since Major Havoc used the Amplifone, none of the > analog multipliers were needed. > No big deal, but if you run a Major Havoc game PCB on a Wells-Garner > monitor you will have some pincusioning(arched in top and bottom, > looking at a drawn square box, such as self test). The adapter > board contain the necessary circuitry to remedy this. But to tell you > the truth, when the game playing > it is hard to see any effect from this pincushioning. > Any additions Clay?? the yolk response or on the deflection board somehow. It looks like Cinematronics might have solved it by using a smaller section of the "sweep" developed by the analog integrators, although they also have some funky analog stuff in there as well. I guess Atari used more expensive caps to try to get a more linear charge curve. At any rate, the WG monitor will "bow" as Jess describes unless a -Clay Clayton N. Cowgill Engineering Manager You must Sign in before you can post messages.
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