Recent content by fcawth

  1. fcawth

    Sure - I will message over the details - I should have a set ready fairly soon since I just need...

    Sure - I will message over the details - I should have a set ready fairly soon since I just need to test the latest batch I just finished. Thanks Fred
  2. fcawth

    Sure and I should have one available for you - I'll send you a message with the details.

    Sure and I should have one available for you - I'll send you a message with the details.
  3. fcawth

    Sure and I should have one available for you - I'll send you a message with the details.

    Sure and I should have one available for you - I'll send you a message with the details.
  4. fcawth

    Just sent you a conversation message with the details. Thanks Fred

    Just sent you a conversation message with the details. Thanks Fred
  5. fcawth

    Troubleshooting a recently-working Asteroids

    You should run the vector generator tests after verifying that the ram is ok. Start with the halt test and move on from there. You can check the halt times to see if at least the digital part of the vector generator is working. If the vector generator is getting stuck then the game will be...
  6. fcawth

    Williams F14 Tomcat beacon motor replacement

    After fighting with fixing the stock AC motor for the beacons on my F14 Tomcat (not a fan of the motor design), I made an adapter to use a $15 DC geared motor (24V 100RPM, offset output shaft) from Amazon. You need to use a bridge rectifier to rectify the AC into DC. I also added a 5W 50 ohm...
  7. fcawth

    Sure - I should have a set ready soon. We have also been able to run a 6800 using the 6502...

    Sure - I should have a set ready soon. We have also been able to run a 6800 using the 6502 adapter with one resistor removed (as well as using the edge connector). I can get you a second 6502 adapter if you want for an extra $15. I have used it on Williams pinball boards (6808/6802) but...
  8. fcawth

    Wanted: System 11A Williams MPU board not working or untested

    Looking for a system11A board that has minimal battery damage to get going for my F14 pinball. Not working or untested is OK as long as it is in OK physical shape.
  9. fcawth

    Sure - I will add you to the list. I have a waiting list that I'm working through but I have a...

    Sure - I will add you to the list. I have a waiting list that I'm working through but I have a bit of a backlog. I can't reply here with a lot of information but if you send me a regular "conversation" here on KLOV then I can send you the full price list and details.
  10. fcawth

    Tempest Plays Blind - But No VG Output At All

    You can use the tester to check the vector generator without the math box connected. That would be a good place to start. The game should also display test mode with the math box disconnected.
  11. fcawth

    Tempest Plays Blind - But No VG Output At All

    I'm not sure why ram chips would prevent the FPGA tester from connecting - I have not seen that before. In terms of the vector generator, you want to start with just the "halt" test and go from there. If you can't get that to work (or the timing is off), you want to focus on getting that...
  12. fcawth

    yes I’m still making them. I am working through the backlog at this point but I’m close to...

    yes I’m still making them. I am working through the backlog at this point but I’m close to catching up.
  13. fcawth

    Announcing the vstcm Colour Vector generator

    Related to DAC speed and DACs in general: The latest revision of this board can write to the X and Y dacs simultaneously using both SPI ports on the Teensy. Also these DACs can be clocked at much higher than 20MHz SPI clock (you can get a couple of MSPS out of them) and seem OK. Really the RGB...
  14. fcawth

    Williams Rev B CPU board woes

    Good luck tracking things down. I usually ground the clock and start connections (currently using the twisted pair wires) but the data probe can often be used without connecting ground which makes it easier to move around. Bad count could be either the clock or the start/stop signal. You...
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