Re: Major Havoc

With adapter
https://lh6.googleusercontent.com/-kuSOFoVWSjc/T_INTvUZ7mI/AAAAAAAAFuc/GjXsfribG98/s576/IMG032.jpg

Without
https://lh6.googleusercontent.com/-QK8776ybEzw/T_INOFKDIaI/AAAAAAAAFuU/ApzqCC7f-Tg/s576/IMG033.jpg

Trace cuts

https://lh4.googleusercontent.com/-dkzXg5kK6Mg/T_INmIXFlmI/AAAAAAAAFuk/i3k3eXZpB3c/s576/IMG036.jpg
On Jul 2, 2012 2:44 PM, "Kevin Moore" <talon.k@gmail.com> wrote:

> 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 17:10:51 2012