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    Thread: Assembling a WPC089 MPU board from scratch

    1. #1
      Sabot68's Avatar
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      Assembling a WPC089 MPU board from scratch

      HI all,
      I have set myself the task of building up a WPC089 MPU board, partly as a project and to have a spare MPU board for my Addams Family pin.
      While I have a basic understanding of electronic components (eg I can tell a diode from a resistor etc) and I am reasonably handy with a soldering iron (surface mount stuff still scares the carp outta me) this is by far the biggest project I have taken on.

      I received the bare board today and have assembled 95% of the components.
      My first question is... there are a bunch of pin outs labelled 'W' 1 through 9, on my bill of components these are described as 0 ohm jumpers, can I use the discarded legs of resistors for this or should the jumper be insulated wire?

      I suspect I will have may other questions as I go along so I ask for your help and patience....

      Andrew

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      Any piece of wire will do - be careful as not all of the "W" jumpers are used - check what RAM and ROM you will be using as this is what these "settings" are for.

      There might be something in here that answers some of your questions:

      http://homepin.com/kits/WPC_INFO.zip

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      Double check every solder joint because solder bridges are bad. And don't overheat the components with the iron. Good luck.
      My collection: Williams WPS "Indiana Jones", Bally WPS "Black-Rose", Williams SS "PIN*BOT", Gottleib SS "Cleopatra", Williams EM "Space Mission", Gottleib EM "Target Alpha", Gottleib EM "Wild life", Chicago coin EM "Funland" Rifle shooter, Hankin 20" crt table, Blue elf2 20" crt upright cab, 20" Mame upright cab & an OutRun2 on a big arse RP tv.

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      Quote Originally Posted by Sabot68 View Post
      HI all,

      My first question is... there are a bunch of pin outs labelled 'W' 1 through 9, on my bill of components these are described as 0 ohm jumpers, can I use the discarded legs of resistors for this or should the jumper be insulated wire?

      Andrew
      You can actually buy 0 0hm resistors.
      http://au.rs-online.com/web/p/throug...stors/0188374/
      That's what was originally used, but wire links would be ok.

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      Quote Originally Posted by c_mario View Post
      You can actually buy 0 0hm resistors.
      http://au.rs-online.com/web/p/throug...stors/0188374/
      That's what was originally used, but wire links would be ok.
      We supplied 0 ohm links in our kits but they aren't necessary. A piece of wire will do the same job.

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      Thanks Again for all the help so far..
      Couple more issues I have.
      I have soldered all the resistors from the list of components on to the board, R76, R81, R99 are left empty.
      Also how can I tell which way the 3 reds leds are mounted, I know the long leg of the led is the positive but there is no polarity marking printed on the board. There is a trace on the board that is common to all three of the led holes so I assume the that is negative? (hole closest to the edge of the board?)

      and how to I mod the board to take a CR2450 battery and holder?

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      Quote Originally Posted by Sabot68 View Post
      Thanks Again for all the help so far..
      Couple more issues I have.
      I have soldered all the resistors from the list of components on to the board, R76, R81, R99 are left empty.
      Also how can I tell which way the 3 reds leds are mounted, I know the long leg of the led is the positive but there is no polarity marking printed on the board. There is a trace on the board that is common to all three of the led holes so I assume the that is negative? (hole closest to the edge of the board?)

      and how to I mod the board to take a CR2450 battery and holder?
      What board are you building? A genuine one?

      The LEDs should have a flat on one side of the printed legend that indicates direction.

      Look at the schematic for the values of those resistors. I don't have it in front of me so I can't look at the moment.

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      WPC89
      R76 1k2 1/4w
      R81 1k2 1/4w
      R99 1meg 1/4w

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      Supposed to be a NOS Williams board
      board crop.jpgboard reverse.jpgwilliams.jpg

      I have looked up the resistor values and they are R76 = 1.2k ohm, R81 1.2k ohm and R99 1M ohm.

      The leds I have do not have a flat side

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      Have a careful look at the very base of the led, there should be a flat section. The actual light emitting section is not flat sided, just the very base section.

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