Circuit Diagrams

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Schematic

The Issue 2B (rev 1) schematic can be downloaded here.

J13 - Daughter board connector

DaughterLocation.jpg Circuit daughter board.png


J15 - Next GPIO

NEXT GPIO location.jpg NEXT GPIO.png


CN5 - Expansion bus (edge connector)

Expansion bus location.jpg Expansion bus.png


J10/J11 - Memory Expansion Ports

Mem Expansion location.jpg Mem Expansion.png


J4/J7 J8/J14 - Joystick Ports

Joystick Ports Location.jpg Joystick Ports.png


CN1 - VGA Video Port

Video Port Location.jpg Video Port.png

Notes:

  • In VGA mode (scandoubler enabled), H-SYNC and V-SYNC are carried separately on their respective pins.
  • In RGB mode (scandoubler disabled), H-SYNC carries composite sync, and V-SYNC carries 1.
  • Pin 14 carries 3V3, which can be connected to SCART pin 16 to indicate RGB to the display.
  • There is no convenient source of voltages between 9.5-12V to indicate 4:3 aspect ratio to the display on SCART pin 8, so this is usually left unconnected.


CN8 - Digital Port

Digital Port Location.jpg Next Digital Port.png


CN2/CN6/CN7 - SD Reader (Mainboard) (CN6 on reverse)

SD Reader Port Location.jpg SD Reader Main.png


CN10/CN11/CN12 - SD Reader (Daughterboard) (CN12 on reverse)

SD Reader Daughter Port Location.jpg SD Reader.png


Accelerator Board

Accelerator Port Location.jpg Accelerator Port.png


Real Time Clock (RTC)

RTC Port Location.jpg RTC Port.png


CN9 - ESP8266-01/RS-232 Port

Video Port Location.jpg Next ESP Port.png