Re: Major Havoc

From: Kevin Moore <talon.k_at_gmail.com>
Date: Mon Jul 02 2012 - 15:44:28 EDT

Ok. Well I do have two cut traces, on the small edge connector, with two
wires running to the DG201's I want to say Pin 7 it's not in front of me
atm.

The image I'm seeing is more than just a pincushion problem. I'll get a
picture in a min.

Kevin

On Mon, Jul 2, 2012 at 2:39 PM, William Boucher <wboucher6@cogeco.ca> wrote:

> **
> Four things to note...
>
> 1/ The T-to-MH conversion board provides pincushion correction that is
> needed to make MH look okay on a wg6100. Obviously the corrected output
> would look wonky on an Amp which requires no such correction.
>
> 2/ The mods suggested for the wg6100 are not required to test out the
> game. Nothing bad will happen if you run the game without those mods.
> Assuming that the mods we are talking about are the addition of zener
> diodes across the transistors on the bottom of the deflection board, those
> were only added as a cheap way to limit the output current in the event
> that something went wrong with the game. The intent was to prevent major
> meltdowns of the monitor while the machine was on route and sitting there
> for many hours or days with a major problem. I have seen several cases
> where adding the zeners actually caused problems for certain games.
>
> 3/ The MH board that you have may need a few small wire jumpers added to
> it in order to make it into a "conversion" version. Dedicated boards do
> not feed "pre-X" and "pre-Y" signals to the specific edge fingers as
> required by the conversion board.
>
> 4/ Another difference between dedicated boards and conversion boards is
> the crystal frequency. There was a slight difference in the frequency
> introduced to make the apparent speed of the spinner seem more like the
> original roller controller. The slower clock has other effects as well,
> such as the pitch of certain sounds. The change may also have been made to
> slow down the vector drawing rate so that the wg6100 could better keep up.
>
> If you need, I can provide photos of my own conversion board output
> section so you can see which edge pads to first isolate and then wire to
> which pins
> The crystal frequencies on my board are...
> Y1 = 9.216 MHz
> Y2 = 8.000 MHz
>
> I'm pretty sure that the required changes are all documented in the
> original Atari conversion docs...
> http://www.biltronix.com/Space_Duel_to_Major_Havoc_Conversion_Files.html
> The above link provides the docs pertaining to the Space Duel conversion
> but I'm sure that I have the Tempest specific ones if you need them (let me
> know).
>
>
> William Boucher
> http://www.biltronix.com
>
> ----- Original Message -----
> *From:* Kevin Moore <talon.k@gmail.com>
> *To:* vectorlist@vectorlist.org
> *Sent:* Monday, July 02, 2012 2:39 PM
> *Subject:* VECTOR: Major Havoc
>
> Have a question concerning the tempest to mh conversion.
> Just repaired a mh board, everything looks great on my pat9000 bench.
> That is until I plug in the conversion board set. The the video goes all
> sorts of bad. I've checked over the components on the adaptor board and
> have found no fault.
>
> Reading over the conversion documents it looks like there is some mods
> needed to the wg6100 before I go and do those mods I'd like to understand
> better what they are for. Mind you I'm running an amplifone setup in the
> pat so I would actually have to convert my tempest to check this thing out.
>
> Kevin
>
>

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Received on Mon Jul 2 15:44:39 2012

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