Emulation of a MOSTEC 8051 sound chip (SID) with a PLD

a PLD-based C64 SID emulation

This is a setup of my DDS-based sound generation used in my PLD-ORGAN 2003.
The sound module is changed that way that it emulates the famous SID in the Commodore 64.

The fundamental waves are TRIANGLE, SQUARE, SAWTOOTH + NOISE.
Filtering and some analog behaviour is included too to tweak the sound.
Also a simple version of the distortion module is integrated.

The R2R-DAC has been replaced in order to use PDM-output.

	PLD organ	SID organ
Clock Frequency	20 MHz	25 MHz
Master Tones	12	12
Octaves	6	6
Tones	72	72
Keyboard	72
Tuning	balanced / pure	balanced
Wave Forms	4	4
Phase Res	8 Bits	10 Bits
Amplitude Res	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	1

The circuit design has first been made for a Xilinx XC4000 PLD and then ported to the new Spartan 2 FPGA.

Listen to a: C64-SID-Sound Example

See my old C64-Synthesizer page: C64-SID-Sound Example

See the FPGA-platform for details:
FPGA Audio DSP Platform

4 channel sound generation
Digital n-Bit Tone Generation Module
virtual R2R- Digital-to-Analog Conversion

setup for SID emulation with automatic organ player

setup for SID emulation with automatic organ player

For more information, see the former system

PLD-based Sound Generation for DIY organ