Monday, June 01, 2020
SN76489 USB
I wanted to make a slightly more modern implementation of my SN76489 USB. The main changes are: Teensy LC, 3.2, 3.6 compatibility, and no need for an external crystal oscillator as the Teensy generates a 3MHz signal for the timing of the SN76489.
The hardware connection is as follows:
Pin 0 to SN76489 write enable
Pin 3 to SN76489 clock input
Pin 4 - 11 to SN76489 D0 to D7
Teensy 5V to SN76489 5V
Teensy ground to SN76489 ground and output enable
Download the code from here:
https://github.com/little-scale/arduino-sketches/blob/master/sn76489_USB.ino
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