Tag: 6581

Replaces one SID socket with two or three emulated SIDs, or combines SID emulation with SFX Sound Expander-compatible FM synthesis.

The official store showed four ARM2SID variants in stock on 2026-07-28, priced from EUR 53 to EUR 58. Choose the cable, optional second socket, and host-specific version carefully. Additional SID and FM modes require the documented chip-select and audio connections; the optional second socket does not carry EXT IN.

Microcontroller-based plug-in replacement for a C64 or C128 6581 or 8580 SID with software configuration, updateable firmware, and analog control inputs.

The official Retrocomp product page showed more than 10 ARMSID v1f units in stock at EUR 34 on 2026-07-28.

FPGA-based pin-compatible 6581 and 8580 replacement with two complete SIDs, six-voice stereo, analog inputs, paddles, and mouse support.

Human review confirmed on 2026-07-28 that the advertised KryoFlux store item is gone. The project documentation, firmware, and configuration software remain available, and used units can still be searched for. An interrupted firmware update can require JTAG recovery.

Open dual-SID board with mixed 6581 and 8580 support, runtime address selection, channel mixing, paddle compatibility, and stereo output.

The complete GPL-2.0 hardware, GAL, Gerber, and build documentation remains available. A Tindie assembled listing reported out of stock since 2020 but says the seller may assemble a unit on demand; treat that as a contact route rather than stocked availability. SID chips are excluded.

Period original SID chips restore authentic 6581 or 8580 sound when matched to the computer's motherboard voltage and filter circuit.

AMI64 offered soak-tested original 6581 and 8580R5 chips from GBP 97 on 2026-07-28. These are finite period parts even when a dealer has stock. Confirm authenticity, revision, test history, socket condition, motherboard voltage, filter components, and return terms. Installing a 9 V 8580 in a 12 V 6581 board can destroy it.

Open FPGA hardware and gateware platform in a DIP-28 package for emulating 6581 and 8580 SID chips.

The official repository provides hardware and gateware, but this bounded pass did not verify a current assembled-product seller.

Cartridge-port second-SID family represented by current SID Symphony reproductions and a selectable-address 6581 SID Cart.

ToTs RETRO listed its ARMSID-equipped CMD reproduction as made to order on 2026-07-28. Shareware Plus also advertises its chip-less 6581 SID Cart from stock, but that page was last updated in January 2025; confirm that variant before ordering.

Partially assembled internal board for adding a second matching SID chip at $DE00 or $DF00.

The MSSIAH availability page reported the SID2SID circuit board in stock on 2026-07-28, and its order workflow includes SID2SID. SID chips, audio wiring, and an output jack are excluded. Shareware Plus separately advertises a parts pack without the PCB or SID chips while its remaining stock lasts.

Adds one or two original SID chips with automatic model detection, selectable mono or stereo addressing, protected power, and a dedicated stereo output.

The official site reported the SIDFX bundle sold out on 2026-07-27 and says no more modules will be manufactured after its limited stock is exhausted. The separate C64 Reloaded MK1 and MK2 adapters are accessories for this same family and do not replace the unavailable SIDFX module.

DIY RP2040- or RP235x-based replacement for one or two 6581 or 8580 SID chips, with optional FM emulation and paddle or mouse input support.

Choose the hardware design and matching firmware together. The official project documents different DAC, PWM, connector, line-output, and host-interface arrangements plus a list of preassembled sellers. Multi-SID or FM modes need the documented address-signal wires. Never power the module from USB and the Commodore computer at the same time.

Current Lotharek redesign of the compact AVR-based replacement for a Commodore 64 SID sound chip.

The Lotharek page exposed a login-or-register-to-buy path on 2026-07-27. The independent nano SwinSIDb tutorial documents the reference design's settings: its J1 selects 6581 filtering when closed and 8580 when open, while J2 enables an output-load resistor for 8580 boards and is left open for 6581 boards. It also says the design lacks paddle analog inputs and external audio input. The seller does not state that its dual DIP switch maps identically, so obtain Lotharek-specific switch and orientation instructions before installation. The latest firmware identified by the tutorial is dated 2012; original development stalled, and the reconstructed archive warns that one unreleased firmware can glitch.

Period enhanced SwinSID replacement adds configurable 6581- and 8580-style sound, readable oscillator and envelope registers, analog input, and paddle or mouse support.

Production ended in 2018 and no current maker or build path was verified. Buy used only with the original manual and configuration software. The documented 6581-board installation recommends disconnecting the 1K output pull-down, while EXT IN needs the specified termination. This is unrelated to current Commodore 64 Ultimate hardware despite the old product name.

Compact SwinSID-derived 6581 or 8580 replacement with hardware mode selection and a higher audio-output level.

Tindie showed 10 units in stock at USD 38.88 on 2026-07-28, while AMI64 listed the same family at GBP 49. Tindie's extracted page gave contradictory US shipping information, so confirm destination eligibility before ordering. X-SID does not support paddles or a mouse, and neither seller publishes technical, firmware, or installation documentation.