High Speed
Williams, 1986
Pinbot
Williams, 1986My project pinbot has a High Speed System 11 (no letter) board in it. I have been able to get the board to boot with Leon's Boot Rom and have tested it out through the PIAs and it seems to work as much as I can tell without putting it in the game. The pinbot ROMs boot but sound is not working.
I know system 11 MPUs are hard to come by. Should I mod this board to work in pinbot or trade it to someone looking for a 11 to get a 11A?
Thanks
Rottendog makes an aftermarket 11A board: http://rottendog.us/MPU011A.html
I happen to have a particularly frustrating High Speed (missing some game sounds (not all) and credit/match display anomalies, so if you can name a good price for the System 11 MPU board, I might bite!
Yes, the only replacement System 11 MPU boards are pulls from trashed machines. There are a number of board techs on Pinside that may take on your board, mine was fixed to a point, but still has a few nagging issues.
FWIW, for you System 11 (not 11A-C) owners out there like me, I actually SAW a 'leaked' Rottendog System 11 MPU board... It's in electrical troubleshooting stages now, so it's probably a year away, if at all, but there IS hope!
No, I don't know what that is, but my guess is a test EPROM?
Maybe I need to borrow one!
My issues are tricky. I get certain game sounds, like the second honk of the horn, but not the first. the only speech is "OK buddy, pull over" etc. Weird. And the sounds worked 100% a week ago, before I plugged in some sweet new Pinscore displays... I'm going after the PSU now, checking for 5V and removing the 100V fuse as it's no longer needed.
My background music is fine.
I have a couple other anomalies that I can live with, but the sounds are literally killing me! No sound ruins this game. 
http://www.pinwiki.com/wiki/index.php?title=Leon_Borre_Williams_System_11_Repair
It pulses the PIAs Low/High and you can track the signal from PIA to output (in some cases). Here's an example from this very board.
The pins on 1J8 would pulse Low/High except for pin 4.
1J8 is driven by the PIA U38 and U38 pins 2-17 moved as expected (1 connector has to be connected to ground to see them all move. details in link).
The Schematic shows the next in line as U40. U40-5 is the output for 1J8-4 and it was Low/High as expected.
SR15 is next and also pin 5. This was Low only. pins 2-4 & 7-10 moved as expected.
Pulled SR15 and U40. U40 tested bad in a chip tester (even though it was working, weird) so I replaced it. While it was out I noticed the trace under the chip (for pin 5) was broken (always test continuity before replacing). Repaired the trace and put in a socket, new 74HCT244 and SRC 4.7k and 1J8-4 moves like it's brother.
Finding this problem on the bench and not on the machine was a great experience for me.
Anyone with an EPROM burner should be able to burn you the test chip.
Wow, looks interesting!
I might order a set or try and burn my own. I'll have to get a PC PSU somewhere.
I'm afraid of ruining my MPU board, though. All I have is a solder sucker and Weller 40 watt pencil.
IDK
Thanks for the cool info!
What is this "Chip Tester" you have?
I bought one of these from Borygard at the last Pin-a-Go-Go
ebay.com link: Multi Function IC LED Optocoupler LM399 DIP CHIP TESTER Model Number Detector
I also bought an inquisitor set from him to test RAM and PIAs
Yeah I bought the Hakko desolder gun a little over a year ago after mucking up a couple of boards. Fix a couple of boards yourself and you've paid for it. You could get both here:
ebay.com link: Hakko FR 300 FR300 05 P Desoldering Gun FX888D 23BY Solder Station Bundle
Wow,
Yeah, I'm killing myself looking at all this stuff. I haven't figured out what EPROM programmer to get yet to burn the test ROM.
That desoldering station is cool, but wow, I just don't know if I'm over my head.
My MPU board has a couple nagging oddities. Would be sweet if I could actually do this.
Anyway, let me know your MPU price when things resolve themselves. If it's 100%, then maybe I can learn to fix the one I have now without remorse...
a lot of guys use the GQ-4X. I have an old Programmer II but since I have an old laptop with a parallel port it works for me.
A good soldering iron is paramount. If you want to do repairs you have to be good at removing components. I know a local guy who does great work with a solder sucker and I just have no talent for it.
I have a local guy that also happens to have an original Williams System 11 test setup! He repaired my board but warned me that something else might go wrong once I get it in my machine, and, it did.
I think he's going to take another peek at it this week.
After this, I want to begin re-educating myself about repairing discrete board issues. I'm looking for a real project pin now, a SS for a couple hundred, that's messed up electronically. My High Speed is in pretty nice condition overall and I am afraid of killing it!
Update: put the board in a high speed with high speed roms. Worked about 90%. Background sound was weird with known good board. Several segments out on displays and 1 solenoid did not fire.
I would be willing to trade for an 11A that needs work too.
I can tell you that any system 11a or 11 MPU you find at expo is going to either be trash, or very expensive. They are like gold these days.
Quite honestly, you have a better chance of buying a non working one with no acid damage on eBay and repairing it.
I do have 2 or 3 of them that should really not be repaired, due to acid damage or massive amounts of missing components.
Repro 11A boards are already out there... I think they are $440:
ebay.com link: Brand New MPU011A MPU Board for Williams Sys 11A 11B pinball machines
The 11nothing boards are pricey too.
The steep repro price makes refurbing a somewhat functioning board with no acid damage, much more affordable.
You may not like the price of a repro system 11nothing board... Expect it to be at least $400+shipping.
Quoted from Cheddar:My project pinbot has a High Speed System 11 (no letter) board in it. I have been able to get the board to boot with Leon's Boot Rom and have tested it out through the PIAs and it seems to work as much as I can tell without putting it in the game. The pinbot ROMs boot but sound is not working.
I know system 11 MPUs are hard to come by. Should I mod this board to work in pinbot or trade it to someone looking for a 11 to get a 11A?
Also, you do not have to mod a High Speed board to work in a Pinbot. It will work without changing anything (just swap ROMS). I have done it more than once.
Quoted from snyper2099:Also, you do not have to mod a High Speed board to work in a Pinbot. It will work without changing anything (just swap ROMS). I have done it more than once.
I noticed some weird behavior with the 7 segment LED with pinbot roms loaded. is this normal?
Yes, the Pinbot boards were changed to work with the 3 LEDs for diagnostics. It's just an artifact of the LEDs not existing. Once you get it 100% using the high speed roms, swap it over to Pinbot roms and it should work great.
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