New WP34S unit

[ebs]

Another one here converted an HP30b into a WP34S, yes in 2023, the project doesn't seem as died since the last build (3916) is from this month.

The WP34S is just superb, the only issue I have found is that in integer/base mode the input is still limited to 12 digits, imho should be possible to enter more with scroll like in HP16C and Casio CM-100.

The procedure I followed for flashing is similar to the Arduino one (thanks adamkov) with these differences:

• I used a CP201x USB to UART/Serial converter (3.3 V lines)
• I connected the TxD, RxD wires directly form the CP201x connector, without breadboard
  • TxD from CP201x to Calculator In (J35, row 1, col 1)
  • RxD from CP201x to Calculator Out (J33, row 1, col 2)
    
• I used two paper clips, one for reset and another one with two parallel pins to erase
• I used only one CR2032 battery and connected the negative terminal of the empty receptacle to GND of CP201x with an alligator, no external power supply for the calculator
• I used a PC with Ubuntu and wp34sflashcmd for flashing
  

This setup worked like a charm. I hope this can be useful for somebody.

Finally I would like to give thanks to Paul, Walter, Marcus and many others that contributed to this great project. Special thanks to spiff72 who in 2023 provides overlays for WP34S and many other calculators.

Edited: Added TxD and RxD scheme to the HP30b connector