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Ultimate Cart (SD multicart) - preorders thread

multicart sd fpga

263 replies to this topic

#226 mulcmu OFFLINE  


    Space Invader

  • 14 posts
  • Location:Pittsburgh, PA

Posted Wed Mar 23, 2016 7:34 PM

I took the plunge and attempted to build some myself.  This was my first attempt at SMD soldering using solder paste.  It went much better than I had expected. I highly recommend using the stencil and solder paste method.  The stencil adds some extra cost, but is well worth the investment.  Electrotrain’s assembly notes on the github page give a good overview.  The stencil is only needed for the side with the FPGA.  For the other side applying the solder paste from the syringe or using a toothpick by hand will work well.  I would recommend having a solder wick/braid on hand (with a very fine braid) even if using the stencil as 2 of my 3 boards had bridged pins on the FPGA.  I found having a magnifying glass and eye loupe necessary to inspect the solder paste and finished solder joints.  I would also spend some time watching the eevblog youtube videos on smd/smt reflow soldering before getting started.


I found that using the stencil was pretty forgiving.  If you mess up applying the solder paste you can wipe it off and start over.  When placing the parts on the solder paste some fine adjustment could be done to get it aligned correctly before pressing it down into the paste to hold it in place.


The PCBs, stencil, and parts to build 3 boards cost about 200 USD.  All of the parts were available from Mouser.com (quick and reasonable shipping in the US at least).  The PCB was easily ordered from Oshpark with the eagle .brd file.  I ordered a mylar stencil from Oshstencil, again all that was needed was the eagle .brd file.


I tested operation of the oven several times with junk boards and some ebay smd breakout boards to get a feel for the operation.  For the cost of a new toaster oven and the solder paste you might be able to join a local hackerspace/makerspace for access to a proper reflow oven.  If they have a laser cutter you could even make the stencil there instead of ordering.


pcb in jig.jpg

PCB in jig to hold in place


stencil aligned with paste.jpg

Stencil aligned over pcb and taped in place


back with paste.jpg

FPGA side with paste


fpga paste.jpg

Close up of FPGA with paste


fpga bridged pins.jpg

Bridged pins after reflow, used the cut end of solder braid to wick out the excess with soldering iron.


fpga clock osc.jpg

Closeup of FPGA and clock oscillator.  Clock does not have exposed pins so need to use oven or hot air.


front with paste.jpg

Front with paste applied by hand


front with paste and parts.jpg

Front with paste and parts


front reflowed with hot air.jpg

Front reflowed with hot air gun.

(I modified the PCB eagle file to add the pull up resistor on the SD card.  In the process I deleted the power trace to the SD card.  Fixed with the black jumper wire.)




#227 pjbramley OFFLINE  


    Star Raider

  • 82 posts
  • Location:Bundaberg Queensland Australia

Posted Thu Mar 24, 2016 5:51 AM

How do we get payment details?

#228 _The Doctor__ OFFLINE  

_The Doctor__

    Flux Capacitor Master Craftsman

  • 6,232 posts
  • Location:10-0-11-00:02

Posted Thu Mar 24, 2016 11:31 AM

hmm.... I was told to do all the parts that need baking first then hot air followed by the drag and finally conventional connections.... The only time that order was altered was when using infra red.... it seems nobody does thru the hole wave soldering anymore...

#229 TechCowboy OFFLINE  


    Space Invader

  • 26 posts

Posted Sat Mar 26, 2016 2:32 PM

Is there any plans for another run?

#230 Bikerbob OFFLINE  



  • 630 posts
  • Location:Mississauga ON Canada

Posted Tue Mar 29, 2016 11:00 PM

I could be very insterested in this if more become available.


I am not interested in building the board.. if I can get a finished unit? or someone finish it for me.



#231 xrbrevin OFFLINE  



  • 331 posts
  • Mr Ziggy loves to extend the 1050 heatsink!
  • Location:UK

Posted Tue Apr 5, 2016 11:23 AM

i am very interested in one of these

please let me know if available


#232 santosp OFFLINE  



  • 790 posts
  • Location:Athens - Greece

Posted Wed Apr 6, 2016 9:49 PM

Is there any plans for another run?



i am very interested in one of these

please let me know if available


P.M. sent. :)

#233 Scooter83 OFFLINE  



  • 671 posts
  • Location:Northern NJ

Posted Wed Apr 6, 2016 10:16 PM

2 for me

#234 Allan OFFLINE  



  • 6,281 posts
  • Location:Wallingford, CT

Posted Thu Apr 7, 2016 6:09 AM

I'm interested in one of these also.



#235 retrobits OFFLINE  


    Chopper Commander

  • 114 posts

Posted Thu Apr 7, 2016 10:14 AM

I would buy a completed cart board.  No smd soldering for me.

#236 TechCowboy OFFLINE  


    Space Invader

  • 26 posts

Posted Thu Apr 7, 2016 2:42 PM

If the complete cart board becomes available, I would like one as well.

#237 AtariSociety OFFLINE  



  • 300 posts
  • Location:Northern California

Posted Thu Apr 7, 2016 10:15 PM

Completed Cart for me if they can ship to USA.  Qty 1.  TJ

#238 Foxbat OFFLINE  


    Combat Commando

  • 4 posts

Posted Mon Apr 11, 2016 5:19 PM

I would be up for a cart as well. Qty 1

#239 bakerb316 OFFLINE  


    Combat Commando

  • 3 posts

Posted Tue Apr 12, 2016 10:02 AM

I would love one as well.  I'd prefer a complteted cartridge but might have a source which could handle surface mount soldering one for me if a parts kit were available to purchase.  If either of these are availabe, please let me know the costs.  Thanks you.  From an avid Atarian since the 2600 but spent most of my time on my 800 & 130XE.

#240 jcbstein OFFLINE  


    Space Invader

  • 21 posts

Posted Mon Apr 18, 2016 2:07 PM

I too would be interested in purchasing a completed Ultimate Cartridge as well.


Hopefully there will be a second run of these.

#241 576XE OFFLINE  



  • 770 posts
  • Location:Moscow, Russia

Posted Tue Apr 26, 2016 12:39 AM

I simply NEED one completed of this.



Best Wishes!

#242 IndusGT OFFLINE  



  • 397 posts
  • Location:Florida USA

Posted Tue Apr 26, 2016 3:28 PM

Been looking for one too thanks

#243 AA737 OFFLINE  


    Space Invader

  • 10 posts
  • Location:US

Posted Wed May 4, 2016 7:19 PM

Interested in one!



#244 davidcalgary29 ONLINE  



  • 6,149 posts
  • Location:Peace River, Alberta

Posted Mon Jun 6, 2016 11:13 AM

I'm in for two!



    Combat Commando

  • 5 posts
  • Location:Kamloops, BC, Canada

Posted Thu Jul 14, 2016 5:27 PM

I love to see items like this available...please put me down for one too...as long as it will work on NTSC, for I am from Canada...thanks!

#246 venom4728a OFFLINE  



  • 615 posts

Posted Thu Jul 14, 2016 9:09 PM


#247 tuf OFFLINE  


    Chopper Commander

  • 245 posts

Posted Sun Jul 24, 2016 12:46 AM

Add me to the list for 1!!

#248 Serblander OFFLINE  



  • 805 posts
  • Location:Melbourne, Australia

Posted Sun Jul 24, 2016 9:09 AM

+1 No Returns! :D


Just got the Lynx SD cart and would love to finally have something like this for my XEGS!!!



#249 Zoyx OFFLINE  



  • 1,581 posts
  • Prominent Internet User
  • Location:Honolulu, HI

Posted Thu Aug 18, 2016 3:25 PM

If this works with the XEGS, I would like to be added to the list. Thanks.

#250 orpheuswaking OFFLINE  



  • 5,767 posts
  • Lone Raider Time!
  • Location:Indianapolis, Indiana, USA

Posted Fri Aug 19, 2016 7:05 AM

Preorders happening in the thread by Santosp, need at least 20 orders... so get over there ;-)



Edited by orpheuswaking, Fri Aug 19, 2016 7:06 AM.

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