+---------------------------------------------------------------------------. Title : Atari Major Havoc Conversion Notes : Version : 0.75 : Date : 02-February-2004 : Author : McClintock : +---------------------------------------------------------------------------. : +-----------. : Disclaimer \ : +-------------`-------------------------------------------------------------. : REMEMBER, NO WARRANTEES, EXPRESS OR IMPLIED, ARE GIVEN. USE THIS : INFORMATION AT YOUR OWN RISK. I AM NOT RESPONSIBLE FOR ANY DAMAGES : THAT MAY OCCUR TO YOUR PERSON OR PROPERTY. : : : : +-----------------------------------------. : Tempest/Space Duel/Gravitar Adapter PCBs \ : +-------------------------------------------`-------------------------------. : Since Major Havoc was originally designed to run on an Amplifone monitor, : it has no 'pincusion correction' built in. Major Havoc conversion PCBs : were sent out of the Atari factory with two jumper wires. : : If you want to use your Major Havoc PCB with an Amplifone monitor AND : still use the Atari adapter PCBs (either the Major Havoc -> Tempest or : Major Havoc -> Space Duel/Gravitar) then you first remove the modwire : jumpers to J19 pins M & N on the Major Havoc main board that goes to the : LF13201's in the AVG. Next, simply cut the conversion board trace to : pin A on J4, then run a jumper wire from p19 pin 9 to J4 pin A on the : conversion board. Alternatively, you could just remove the resistor : (R???) connected to pin A on J4. : : Those two MOD wires are the pre-outs for the conversion boards. They should be added to all boards as per an Atari service bulletin. If you are using a Major Havoc -> Tempest harness adapter PCB, you will : need to flip the smaller edge connector in order for a Major Havoc PCB to : work properly in a Tempest with a Tempest conversion board. You will need : to cut the cable ties that are between the large and small board connectors : on the Tempest harness. Once done, the smaller of the two connectors 180 : degrees and it will work fine. If you do *not* do this, you will have no : sound. Also, there will be a "P" displayed in Test mode (Bad Pokey). The : shield button may also reset the game when pressed! Don't worry though, : you will not damage your board if connected wrong. Just flip the connector : the proper way. : : : +-----------------------------. : Make Your Own Adapter Harness \ : +-------------------------------`-------------------------------------------. : The following instructions allow you to convert a Space Duel ("SD"), : Gravitar ("GRAV"), or Black Widow ("BW") to a Major Havoc ("MH") : : : 1. The Game Board. : ------------------ : Atari released Major Havoc in three varieties: : As a dedicated cabinet, similar to that used for I Robot; : As a conversion for Tempest; and : As a conversion for Space Duel, Black Widow and Gravitar. : : The two conversion Major Havoc boards should be the same, using a small : daughter board containing four 4-pin POKEYs and labelled "Quad Pokey". The : dedicated Major Havoc board will have some slightly different component : values and may not be completely compatible with a conversion installation. : If your MH board is missing parts, DO NOT PROCEED. : : The two conversions PCBs came with a harness and monitor adaptor board. : If you have access to the official Atari SD/BW/GRAV to MH adaptor, you : have no need to read this. If not, you'll have to make your own, so read : on. : : : 2. Atari adaptor boards. : ------------------------ : The official Atari adaptor board moved X deflection adjustment off the : main pcb and onto the adaptor board. The following document will not : attempt to do this - the X adjustment will remain on the game pcb. : : ****** IMPORTANT ****** : To allow the X adjustment to take place on the adaptor pcb, Atari cut : P19 M/N from ground, and jumped M/N to the legs of two ICs in the vector : generation circuitry. : : If these two jumpers are present on your board, you MUST REMOVE THEM : (desolder both ends, and pull the wire off the board) BEFORE CONTINUING. : If your board, does not have the jumpers, it was probably used in a : dedicated MH cabinet. : : If you remove the jumpers, this board will no longer work with an official : Atari adaptor, unless you reconnect the jumpers. : *********************** : : : 3. Making an Adapter Board. : --------------------------- : Major Havoc and Space Duel/Gravitar/Black Widow require many of the same : signals, just not on the same pins of the edge connectors. Therefore you : need to adapt the signals corresponding to the 'wiring' notations below. : There are probably 1001 ways to make an adaptor, I used the method : described in Rick/Steve's Gravitar to Tempest conversion document: : : GAME-HARNESS (P20): PCB:E/C1:wiring:E/C2 :MH-BOARD : GAME-HARNESS (P19): PCB:E/C3:wiring:E/C4 :MH-BOARD : : 'E/C' are the edge connectors. You will need 4 total (two 24-pin [E/C 3,4] : and two 44-pin [E/C 1,2]). 'PCB' is a male-to-male 0.156" finger board and : 'Wiring' is the crossover wiring used to adapt the signals. Using different : coloured wires, and strong wire at the edges (20 gauge) is a good idea. : : Remember that the harness numbers below are displayed on the harness : edge connectors. The numbers on EC 1,3 will be reversed and should not be : used as a reference. : : Line MH Harness : ---- -- ------- : : P20 P20 : --- --- : +5V RTN 1/A 1/A (wire both lines) : +SENSE 21 21 : -SENSE 22 22 : +5V REG 2/B 2/B (wire both lines) : +22V DC X 3 : -22V DC W 4 : 10.3 UNREG E E : : SW GND (UTIL) N N : SW GND (COIN) 12 N : SW GND (CNTL) Z 12 : +5V Y Y : TEST F T : : COIN L 7 16 : COIN R 6 U : COIN AUX K S : CTRL L S H : CTRL R T 6 : : P20 P19 : --- --- : AUDIO 1 8 12 : AUDIO 2 9 11 : AUDIO 1 GND 11 M : AUDIO 2 GND M M : : P19 P19 : --- --- : RED 4 7 : GREEN 6 8 : BLUE 8 9 : RED GND D H : GREEN GND F J : BLUE GND J K : X OUT 9 A : Y OUT L B : X GND K 1 : Y GND 10 2 : : P20 : --- --- : FIRE L *1 *2 : SHIELD P *1 *2 : DIR 16 *1 : CLR U *1 : LIGHT R *3 : : : 4. Notes. : --------- : *1: Wire to the controls of your choice. I used a Gravitar panel, installed : an encoder wheel in place of the button, and connected it to : wires from and as follows: : : MH GRAV : -------------- ---------------- : Encoder Ground -> Ground : Encoder +5V -> Jumped from Start2 +5V : Encoder CLR -> (P19-3) : Encoder DIR -> (P19-6) : : : I connected Fire and Shield to Rotate Left and Right as follows: : : MH GRAV : -------------- ---------------- : Fire(P20-L) -> Rot R(P19-5) : Shield(P20-P) -> Rot L(P19-E) : : For Space Duel, pick equivalents. : : For Black Widow, you will need to drill at least one extra hole, and : obtain some leaf switches. : : : *2: Fire and Shield are used to start a game. Optionally make additional : parallel connections to Start1/2: : : MH GRAV/BW : -------------- ---------------- : FIRE(P20-L) -> Start1(P20-M) : SHIELD(P20-L) -> Start2(P20-11) : : MH SD : -------------- ---------------- : FIRE(P20-L) -> Start(P19-6) : SHIELD(P20-L) -> Select(P20-11) : : : *3: Start1/Start2 LED's may be wired in parallel to the encoder light. Be : sure to wire a 150 ohm resistor in series on each line: : : MH GRAV/BW/SD : -------------- ---------------- : LIGHT(P20-R) -> (-150ohm->P20-7, -150ohm->P20-J) : : : +----------------------. : Spinner & Whirley-Gig \ : +------------------------`--------------------------------------------------. : Resistor R186, a 1k ohm 1/4 watt, is missing on some Rev B Kit : boards. It is located near the LETA chip (137304-1001) at location 12N, : underneath the Quad Pokey Adapter board on the main logic board. The : symptom if the resistor is not loaded is very slow movement of Major : Havoc by the Whirley-Gig. The added resistor doubles the response. : Dedicated Major Havoc boards do not have a spot for R186. The dedicated : Major Havoc board does not have a place for R186. It could be added by : cutting a trace and adding the resistor, but I will not get into that here. : : The Tempest and Major Havoc spinners have only one minor difference (which : isn't hard to spot when you get the schematics out) -- The Optical board : on the Major Havoc spinner has a 150 Ohm resistor, and the Tempest spinner : has a 100 Ohm resistor. : : With the addition of R186, your Tempest spinner should now work properly on : your Mojor Havoc board. : : : : +---------. : Crystals \ : +-----------`---------------------------------------------------------------. : Major havoc boardsets that were meant to run in a Tempest Conversion (ie : using a Wells-Gardner 6101 monitor instead of an Amplifone) had slower : crystals in them so that the monitor could handle the drawing rate. : : Original boards had a 12.0 and 10MHz while the conversion boards replaced : them with a 10.0 and 8.9MHz respectively. : : Dedicated Conversion : --------- ---------- : Y1=12MHz Y1=10MHz : Y2=10MHz Y2= 8.9MHz : 10 pin edge connector 12 pin edge connector : : Also the integration capacitors are DIFFERENT depending on the Y1 clock. : If you change Y1 to a higher frequency, You will need to change the : integration capacitor to a larger value (???). : : You can tell a 'conversion' board just by playing it because the sounds : are about 3 steps down in tone, they also play much slower, which is : probably good since you just can't do as much with the tempest spinner : compared to a nice roller! : : : : +--------. : Credits \ : +----------`----------------------------------------------------------------. : Michael Kelley : Joe Bachmann : Michael Patterson : Scott Swazey : Jess Askey : Tony Jones : : +---------------------------------------------------------------------------: