A venture in retrotronics

Even though I didn't have the money to buy one myself back then in the early eighties, the Commodore 64 was my first love. And that had everything to do with the Video Interface Chip (VIC-II) and the Sound Interface Device (SID) in this machine.

In this project I've created a development board connecting a SID sound chip to an ATmega328P MCU. A 74LS374 IC containing eight D-type flipflops is used as a register to temporary store the address for the SID chip while setting up the data, allowing the address and data bus to be combined at the MCU pins.

Although I haven't put these to use yet, even the SID's pins for the paddles and the line in pin have been made available via connectors.

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