Re: Testing System 1 Main Boards

I found a little info.... Says if you don't plug in the MM Cartridge board in... Its should report... NO Cartridge....

http://www.aaarpinball.com/MM/MM.htm

My board is the same one pictured and has the resistor mod and the two wire links on the cut track.....

Mine also has extra circuitry which goes to the reset pin on the 6502A sound CPU... Odd !!!!

I've socketed the 68010 CPU that had correded pins and also the two Roms on the main board, but I'm now greeted with the Reset LED flashing... ( I presume thats what it is ?)

Still same old rug pattern, so I need to re-check my work now.... broke a couple of pads on the CPU although I was careful ( I gave the board a good scrub after I had removed the Old socket), so a couple of the pads were dislodged.... so will have to test for continuity and also I may plug the fluke 68000 pod and my 9010a and do a few basic tests on the bus , rom and ram....

My Test bench is not set up yet in my new garage, so it may take some time !!

Will give me something to play with over Christmas :)

Regards,
Colin

  ----- Original Message -----
  From: Colin Davies
  To: rasterlist@vectorlist.org
  Sent: Tuesday, December 20, 2011 7:20 PM
  Subject: RASTER: Testing System 1 Main Boards

  Hi Guys,

  Can you run diagnostics on these using the test switch on the ArIII without having the rom board plugged in please ?

  All I getting is a random rug pattern, but I had it kind of booting up to some tests at one point when I flexed near the CPU.

  I think the CPU socket has corrosion as it looks like a drop of water has ran down one of the power busses, dropped on the cpu , ran down, and corroded about 5 pins on both sides.

  The one I have I'm told from a good source that it was working 6 months ago.

  It also has a couple of logic chips piggy backed and some wire wrap wiring mods to the right of the CPU ( An early revision or a reset bodge or soething perhaps ?)

  I've not had time to look at it yet properly, but tried reseating the CPU.

  Also has any one tried plugging a 68000 fluke pod into these and testing memory etc ? - Yes, I realise that it uses a 60101 but they are supposed to be pin compatable.

  Thanks for any advice, Regards, Colin

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Received on Thu Dec 22 13:25:00 2011