The SIDKick pico ("SKpico") is a drop-in replacement for the SID 6581/8580 sound chips in the Commodore 64 and 128 computers, and it can also emulate the SFX Sound Expander (FM). It has been designed as an inexpensive alternative to other replacements while not making compromises regarding quality. It consists of a simple interface board and a Raspberry Pi Pico (or compatible clone). The emulation is based on an extended version of reSID 0.16 (with parts from reSID 1.0), and also includes a few additional features:

• dual 6581 and/or 8580 emulation based on reSID (optional: extension for digi-playing techniques), or 6581/8580 plus FM emulation
• 2nd-SID address at $d400, $d420, $d500, $d420 + $d500 simultaneously, $de00, $df00 (on C128 no $d500), or any address when an external chip select signal is used (e.g. on Ultimate 64 boards)
• paddle/mouse support
• built-in configuration menu (launch with "SYS 54301"/"SYS 54333", also from C128-mode)
• built-in PRG launcher ("SYS 54333,0" etc. or from the menu)
• two hardware variants with sound output via ...
• PWM (mono) through the C64/C128 mainboard and/or in stereo via a PCM5102A-DAC-board, or
• onboard-DAC through the C64/C128 mainboard and/or line-out

THIS IS THE PCB FOR PWM-OUTPUT OR EXTERNAL DAC-BOARD!

(here is the PCB with an onboard DAC, and here is the SKpico2040DAC which has RP2040, DAC etc. on one small PCB))

Please see the SKpico GitHub-page for more information and firmware.