I am take care to minimize external components, use maximum features integrated on PICO board: Power switch use enable input on PICO, ON-BOARD LED is visible thanks to missing solder mask on skull, PICO boot button hole. Overall dimensions are smallest as possibly.

SWOT analysis

Strengths:

• no competition
• simple as possible
• cheap
• beautiful design (I'm shameless)
• qwerty keyboard
• HD IPS display - onboard
• any display, iPS, TFT, OLED, eInk by wires, need just redesign front panel
• circuitpython
• micropython
• arduino core

Weaknesses:

• my programing knowledge is basic

Opportunities:

• GUI learning tool
• native USB
• ETHENRNET possibility, there is big opportunity in application where is needed something like networking plug and play ... quick connect to LAN with DHCP configuration, etc. simple terminal
• standalone computer programmable in basic or micropyton

Threats:

• please write in comments, I am blinded by my enthusiasm

FEATURES:

• Smallest as possible 100x65x8mm
• Absolute minimum components.
• Auxiliary USB-C for power only.
• Access to boot button
• bonus flashing star with internal led.
• IPS 240*240 display. 3 types or more
• Speaker
• free GPIO header
• Reset button
• power switch controlling internal buck-boost
• optional RFM95 LoRa radio

TODO:

• module header for wiznet or another ethernet module

Working software features (demo codes):

• circuitpython display example
• micropython display example
• arduino display example
• arduino keyboard example

Supported displays:

• 12pin st7789 IPS 240x240 via flex cable 1.3" inch
• 2pin st7789 IPS 240x240 via flex cable 1.54" inch
• 8pin st7789 IPS 240x240 via header
• any display with popular china module pinout GND,VCC,SCK,DAT,RES,DC,CS,BACKLIT

CODE EXAMPLES and DEFINITIONS

  #define TFT_CS        17
  #define TFT_RST       21
  #define TFT_DC        16
  #define TFT_MOSI      19
  #define TFT_SCLK      18
  #define TFT_BACKLIGHT 20 //Display backlight pin 
  #define speaker      0  
byte colPins[COLS] = {1, 2, 3, 4, 5}; //connect to the column pinouts of the keypad extra cursor keys 14
byte rowPins[ROWS] = {6, 9, 15, 8, 7, 22}; //row pinouts of the keypad
char directKeys[ROWS][COLS] = {
  {KEY_RETURN, ' ', 'm', 'n', 'b',},
  {KEY_DELETE, 'l', 'k', 'j', 'h',},
  {'p', 'o', 'i', 'u', 'y',},
  {KEY_SHIFT, 'z', 'x', 'c', 'v',},
  {'a', 's', 'd', 'f', 'g',},
  {'q', 'w', 'e', 'r', 't',}  
};

Features video presentation ...

Retro computer emulation ...

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