# OPM2151 Drop-in replacement for YM2151

Modern version of the famous 80's Arcade and early high-end PC Audio chip

- **Seller:** [Wavicle's store](https://lectronz.com/stores/wavicle), Bothell, Washington, United States
- **Price:** $20.00 (USD, before shipping and taxes)
- **Availability:** Coming soon
- **Categories:** Retrocomputing, Synth
- **HS code:** 854290
- **Product page:** https://lectronz.com/products/opm2151-drop-in-replacement-for-ym2151

## Options

**DAC**

- With I2S DAC [Add $2.00]
- None
- With salvaged YM3012 [Add $3.00] (10 left)

## Images

![OPM2151 Drop-in replacement for YM2151](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NDEyOTIsInB1ciI6ImJsb2JfaWQifX0=--c15355975f093d91b85aa4a0d742172c0ec8a2c0/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJKUEciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--a1419a086f227676aca33a49760ac51e58b523e3/2025-03-17T03-3A14-3A28.063Z-OPM2151_MKTG1.JPG)
![OPM2151 Drop-in replacement for YM2151](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NDEyOTMsInB1ciI6ImJsb2JfaWQifX0=--b736ed4f8d68fecdf26302b04cabbfaaef20f57c/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJKUEciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--a1419a086f227676aca33a49760ac51e58b523e3/2025-03-17T03-3A14-3A28.063Z-OPM2151_MKTG2.JPG)

## Description

# OPM2151

## The ultimate retro FM-synthesis audio chip

Experience the audio that powered such arcade games as Marble Madness, Outrun, After Burner II, and many Williams Pinball machines!

## Faithful reproduction

This is not salvaged chip! It is a modern FPGA replacement for a vintage YM2151.

The OPM2151 is a pin-compatible, cycle-accurate drop-in replacement for the vintage Yamaha YM2151 "OPM" 8-channel, 4-operator FM-synthesis chip. Painstakingly reversed engineered from die-shots of the YM2151, OPM2151 is a highly accurate reproduction of the YM2151 and perfectly accurate at the clock edges.

## Works with old and new DACs

The original YM2151 required a digital-to-audio converter (DAC) IC and OPM2151 is no different. OPM2151 integrates seamlessly with existing boards using a YM3012 or YM3014 DAC or with a companion I2S DAC, available as an add-on option here. When paired with an I2S DAC, OPM2151 outputs the full internally-calculated 16-bit digital audio.

The companion I2S DAC fits the same IC socket as YM3012 and the OPM2151 + I2S DAC pair can function as a drop-in replacement for a YM2151 + YM3012 pair. The I2S DAC only works with OPM2151 and requires closing solder jumper JP2 "I2S Mode" on the bottom of the board with a blob of solder.

### Errata

Some Arcade boards, e.g. the Atari System 1, swap the SH1 and SH2 signals between the YM2151 and YM3012. In order for the OPM2151 + I2S DAC pair to work in an Atari System 1 and similar arcade machines, solder jumper JP1 "SAM Swap" must be closed with a blob of solder.

OPM2151 + I2S DAC pair work in all vintage arcade and pinball systems tested, but they **do not work in the Commander X16** due to a bug in the X16 PCB design. A suggested board fix for the Commander X16 will be provided on request.

## Shipping policy

Shipping outside of the United States will be fulfilled via GlobalPost.