Assembly

Changing "modes"

These modules can be used in SPI or 8-Bit mode. Somewhat annoyingly, the only way to switch modes is to desolder/solder jumpers on the back of the modules.

SPI Mode

This is the mode you likely want to be in. Your module probably came with this setting by default.

Make sure the R5 and R3 resistors are soldered in and the R2 and R4 spots are blank

8-Bit "6800" mode

Make sure the R3 and R4 resistors are in place and the R2 and R5 are missing. You'll need to remove the R5 resistor to move it, by heating up the resistor with a soldering iron and maybe even melting a little solder on.

I2C mode

Make sure the R2 and R5 resistors are in place and the R3 and R4 are missing. You'll need to remove the R3 resistor to move it, by heating up the resistor with a soldering iron and maybe even melting a little solder on.

(If you solder and re-solder the resistors 10 times like I did while figuring out all the setting and wiring, you'll get a kinda messy/fluxy look like the above! In that case you can clean up with some IPA wipes. Or just revel in your punk soldering job)

This guide was first published on Aug 07, 2015. It was last updated on Aug 07, 2015. This page (Assembly) was last updated on Aug 19, 2019.