(Topic ID: 221370)

System 11 board compatability


By woodmedic

11 months ago



Topic Stats

  • 8 posts
  • 5 Pinsiders participating
  • Latest reply 11 months ago by wamonkey
  • Topic is favorited by 2 Pinsiders

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#1 11 months ago

Could someone please confirm if a system 11b mpu would work with no problems in F-14 Tomcat? I am just wanting to confirm that the extra parts are not needed in the audio section that are missing on the "b" version that were present on the "a". Thanks!

#2 11 months ago
Quoted from woodmedic:

Could someone please confirm if a system 11b mpu would work with no problems in F-14 Tomcat? I am just wanting to confirm that the extra parts are not needed in the audio section that are missing on the "b" version that were present on the "a". Thanks!

That is correct, you can substitute the 11b "as is" for the 11a

The System11b CPU board is not quite as flexible as System11a or System11, because 11b is missing the U1 sound amplifier and associated parts. The System11b CPU will work "as is" in a system11a or system11c game. But these sound part must be added back for a System11b CPU board to work in a System11 game (High Speed, Road Kings, Grand Lizard).

#3 11 months ago
Quoted from wayout440:

That is correct, you can substitute the 11b "as is" for the 11a
The System11b CPU board is not quite as flexible as System11a or System11, because 11b is missing the U1 sound amplifier and associated parts. The System11b CPU will work "as is" in a system11a or system11c game. But these sound part must be added back for a System11b CPU board to work in a System11 game (High Speed, Road Kings, Grand Lizard).

Is there a current option - for any System 11 games like - High Speed, Road Kings, Grand Lizard - can anyone adapt a Rottendog board.

Any options at all - a System 11 board and 11a - original - are non-existent.

#4 11 months ago

Posted by wayout440 on another thread, very useful info:

The least flexible CPU boards is system11c, since the sound circuit is completely removed, and a separate sound board is used. This board can only really be used in system11C games because of this. Populating the missing sound section on a system11C board would be difficult, as some of the sound chips are hard to find (and expensive). But the system11c CPU board *can* be used in many sys11/11a/11b games if the accompanying D-11581 sound is used too.
The most flexible CPU board is system11A. The system11A CPU board can be used in any 1986-1990 sys11, sys11b or sys11c game The only exception is if the sys11A CPU board is going into a original sys11 game (High Speed, Road Kings, or Grand Lizard). In this case, connector 1J15 (four pins, .156" molex male header) must be added to the sys11a CPU board (that's all that needs to be done). To use a system 11a board in a system 11c game, don't use connectors 1J16 (volume control) and 1J15 (speakers). Also the sound ROMs at U21 and U22 are not used, since they are moved to the sound board.
The original system11 CPU (as used in High Speed, Grand Lizard, Road Kings) is also very flexible, after the CPU board is modified slightly. It can work in any sys11, sys11a, sys11b or sys11c game with these modifications. CPU connector 1J18 pins 6,7 must be run to ground, otherwise the special solenoids will not work in sys11b and later games. Also there are six 1N5234 6.2 volt zener diodes that should be added to the back of the CPU board. If using a system11 board in a system11c game, just don't use CPU connectors 1J16 (volume control) and 1J15 (speakers), and the sound ROMs at U21 and U22 are not used.
System11B CPU board are also very flexible, and can be used in any System11A or 11C game. However the system11B CPU board will not work in the four original System11 games (High Speed, etc.) though, because of the missing amplifier circuit. System11B will also work in a System11C game - just don't use CPU connectors 1J16 (volume control) and 1J15 (speakers), and the sound ROMs at U21 and U22 are not used.

The System11b CPU board is not quite as flexible as System11a or System11, because 11b is missing the U1 sound amplifier and associated parts. The System11b CPU will work "as is" in a system11a or system11c game. But these sound part must be added back for a System11b CPU board to work in a System11 game (High Speed, Road Kings, Grand Lizard). If using a system11b board in a system11c game, the CPU sound ROMs at U21 and U22 are not used.

#5 11 months ago
Quoted from wamonkey:

Is there a current option - for any System 11 games like - High Speed, Road Kings, Grand Lizard - can anyone adapt a Rottendog board.
Any options at all - a System 11 board and 11a - original - are non-existent.

I can't speak specifically for Rottendog, I think they make replacements for the various generations of System 11. boards...availability of those may be another issue altogether. K

#6 11 months ago

My F-14 currently has a Rottendog MPU in it. I think the sound is very poor which is why I found a system 11 MPU to put in it. I just hope the board I found will work without too much trouble.

#7 11 months ago
Quoted from woodmedic:

I think the sound is very poor which is why I found a system 11 MPU to put in it. I just hope the board I found will work without too much trouble.

I have a spare System 11 (nothing) board that I ran a bench test on. You definitely need to follow wayout440's advice about connecting certain pins to ground.

More information can be found at http://www.pinwiki.com/wiki/index.php?title=Williams_System_9_-_11#MPU_Driver_Boards if you're interested.

#8 11 months ago

The only available board I can find is a Rottendog - I emailed them direct they did not say specifically it will work rather they are considering a board for the original System 11 games like High Speed, Road Kings, & Grand Lizard.

I would love to know if anyone made a Rottendog board work for an original system 11.

The quote "Pinwizkid" - is what I have read from Vid1900 on the boards before but that again does not specifically specific state the same will work with Rottendog. Think of it this way - I don't want to buy a board and then not be able to use it or take a loss on it to resell it.

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