Emulation of the MOSTEC 8051 SID sound with FPGAs

FPGA-based C64 SID emulation

This is a special setup of my DDS-based sound generation used in my VPLD-ORGAN.
It emulates the function of the famous SID in the Commodore 64.

Unlike in the first version SID-Emulation the sound here is triggered by an internal Player
using a reduced set of MIDI commands. It totally replaces the keyboard and plays automatically.
Altogther 2 channels with 3/4 voices each can be used in FPGA one module.

The fundamental waves are SINE, SQUARE and TRIANGLE, SAWTOOTH and NOISE.
Special Filtering for analog behaviour is included too to tweak the sound.

Also an enhanced version of the distortion module is integrated

Virtual R2R- Digital-to-Analog Conversion is used to make use of the PDM-function.

	PLD organ	SID organ
Clock Frequency	25 MHz	25 MHz
Master Tones	12	12
Octaves	6	6
Tones	72	72
Keyboard	72
Tuning	balanced / pure	balanced
Wave Forms	4	4
Phase Reso	8 Bits	10 Bits
Amplitude Reso	8 Bits	8 Bits
AD - Conversion	real R2R	virtual
DAC OUT	12 Bits	1 Bit PDM

Configuration
Octaves	6	6
Registers	2	2
Modules	18	2

Listen to a remake of an an old video game track: DingDing86

Listen to a file with the former Version: SID-Sound Example

See the FPGA-platform for details:

FPGA Audio DSP Platform

2x4 channel sound generation
Digital 4 Bit Tone Generation Module

electronic MOSTEC SID emulation with FPGA

SID - sound routing setup for Synthesis