KeyI-84 Partially Assembled Kit


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The Group Buy for the KeyI-84 is now open!  If you have been seeing those 4 function calculators hitting the top of r/mk and wished you could have a fully featured graphing calculator with custom switches, this is what you have been waiting for!  We have designed 2 PCBs that connect to the original PCB of a TI-84 Plus CE, a custom aluminum top (with angled display) and bottom plate, and a set of keycaps to be produced by Signature Plastics containing all the legends from the original calculator.  This does not change the function of the calculator in any way, and is a hardware only modification, which does not have to be tethered to a computer and retains the original calculator’s battery.

This kit requires some assembly.  See parts list and tools list below.


  • 1x MX pcb
  • 1x Calculator daughterboard assembled with original new TI-84 Plus CE PCB
  • 49x Dye sub DSA keycaps
  • 2x Ribbon cables
  • 1x LCD extension PCB+cable
  • 1x Aluminum switch plate with attached LCD screen
  • 1x Aluminum base plate
  • 1x Power Button + Keycap (non-MX)
  • 1x Reset Button
  • 1x Charging cable (mini-USB) (only if we are buying the calculator new for you)
  • Adhesive strips
  • Mounting hardware
  • Instruction Manual

Required Tools/Materials:

  • Soldering Iron
  • Solder
  • Small Screwdriver
  • Allen Key (included)
  • 49 MX style keyswitches (not included)


  • Group Buy 4/27 – 5/27
  • Manufacturing Lead Time  6/8 – 9/14
  • Shipping 9/16 – 9/30

This timeline should account for delays due to the state of the world, but with group buys there is always some level of flexibility required.  We will keep everyone updated if the timeline has to change.


Group Buy Info:

GB will run from 4/27 until 5/27.  Minimum Order Quantity is 10 kits of any type in total.  For the first 10 orders, we will only put holds on accounts but not actually charge them.  If MOQ is not hit, the transactions will be canceled.  Otherwise you will be charged once the 10th order is placed.


Shipping Info:

Right now it looks like it will be flat rate priority USPS mail.  Our website is only prepared for domestic US shipping.  If you are outside of the US, you can either use a proxy, or email us at with the subject “International Shipping” and we can try to work something out.


Calculator Info:

If you have a used/already purchased calculator (TI-84 Plus CE ONLY), you can send it in to us.  Select that option on the product page, place your order, then send an email to with the subject “Order ### Calculator Mail” (insert your order number for ###).  If you place the order with this option, but don’t send an email, we will try to contact you, but within a week of the groupbuy ending you must get in contact with us.  If not, your order will be refunded except for the 3% paypal fee.

Additional information

Are you mailing in a calculator?

Yes (read description), No


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