Re: What system 11 board came with an LCD on the MPU?

On 3 Dec 2005 12:24:16 -0800, Gorgar wrote:

>>I was talking the 7 Segment display. This board was from an early F-14
>>Tomcat and is now in the process of being converted to work in a SS.

I doubt it. Never saw a System 11 CPU in an F-14. Check the serial number or white
sticker on it. Both have the game number on it. Early Pinbots used some modified
System 11 boards. The three diodes were soldered across the pins of the 7-segemt
LED together with a sticker from the factory which led is which.
>>
>>I got the specials working C/O Frank (Thank You) and I am in the
>>process of installing the zeners (My local guy only had 4 so I can only
>>do 4 today)

the zeners are not really needed. Just an additional protection circuit which is
usually useless if the solenoid voltage get's into the switches.

>>My question is: What is making the sound not work. I'm pretty sure it
>>is the difference in the MPU's. Just not positive.
>>
>>I did verify that the sound board is the right one per Marvin's tech on
>>system 11.
>>
>>I am getting a really gargly crappy sound when the game first boots.
>>Its like bad static. Then it may or may not go away. It will adjust if
>>I turn the volume up and wown, but I get no gameplay sounds at all.
>>
>>somthing to do with the Mpu?

Sound should work otherwise you have a defective CPU or bad roms. The soundcard is
usually ok but you can verify it buy attaching the volume pot and speaker directly
to the CPU. Speaker goes to J15 and pot to J16.

The first System 11 CPUs used in High Speed are incompatible with later
soundcards. See if you have a jumper W16 between the 7-segment and the flipper
enable relay. If it's there you are lucky. Otherwise the CPU will not reset the
B/G sound card. Reset pin on 1J12 is connected to another pin. It's not documented
in the schematics.

Regards
Frank-Rainer Grahl
(frgrahl@xxxxxxxxxxxxxxxxx)


.

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