Neotron 600

The Neotron 600 is an open-source PCB which plugs into the Teensy 4.1. Using the Teensy 4.1 gives it excellent performance, an Ethernet PHY and a support for an easy-to-fit external QuadSPI SRAM chip. The only downside is that the pinout limits the colour output to 7 bits (128 colours).



  • Processor Module: Teensy 4.1
    • CPU: NXP i.MX RT1062 SoC
      • Core: 600 MHz Cortex-M7
      • RAM: 1024 KiB FlexRAM
      • ROM: 128 KiB Boot ROM (factory programmed mask ROM)
      • GPU: NXP i.MXRT LCD Controller
        • 1366x768 maximum resolution
        • Supports bitblit, rotation, alpha, chroma-key
    • 8 MiB Flash
    • 8 MiB QuadSPI SRAM (optional)
    • 10/100 Ethernet PHY
  • Video Output: SVGA
    • Nominally 800x600 at 60 Hz
    • Other resolutions TBD (depends on pixel clock)
    • Texas Instruments THS7316 Video Amplifier used to drive 75 ohm VGA output
    • 2x 2-bit + 1x 3-bit 0.1% R2R DACs, to give max 128 (2^7) colours
  • Storage: SD Card slot, supports FAT16/FAT32 and MS-DOS partition tables
  • USB: 2x external USB 2.0 Full-speed Type-A Host ports (with a header for two more)
  • Audio: 16-bit 48 kHz stereo
    • Wolfson WM8731 Audio CODEC
    • 3.5mm stereo Line Out
    • 3.5mm stereo Amplified headphone output
    • Digital volume control
  • Keyboard/Mouse: 2x PS/2 Ports (2x 6-pin mini-DIN)
  • Serial: RS-232 on 10-pin 2.54mm header suitable for DE-9 plug on IDC ribbon, MAX3232 transceiver
  • Ethernet: Standard 100base-TX RJ45 port (driven from PHY on Teensy 4.1)
  • Expansion: 4x internal 2.54mm 2x6 headers carrying power, SPI, I2C and a dedicated IRQ line
  • RTC: MCP7940N RTC and coin-cell battery backup
  • Mechanical Form Factor: microATX