Update README.md

Docs

README.md

@@ -1,16 +1,26 @@
 ![](../../workflows/gds/badge.svg) ![](../../workflows/docs/badge.svg) ![](../../workflows/wokwi_test/badge.svg)
 
-# What is Tiny Tapeout?
+# SN76489 PSG
 
-TinyTapeout is an educational project that aims to make it easier and cheaper than ever to get your digital designs manufactured on a real chip.
+Info
+* https://en.wikipedia.org/wiki/Texas_Instruments_SN76489
+* https://www.vgmpf.com/Wiki/images/7/78/SN76489AN_-_Manual.pdf
+* https://www.vgmpf.com/Wiki/index.php?title=SN76489 (Video Game Music Preservation Foundation)
+* https://www.smspower.org/Development/SN76489
+* http://www.acornatom.nl/sites/atomreview/howel/parts/76489.htm
 
-To learn more and get started, visit https://tinytapeout.com.
+Implementations
+* https://github.com/OpenVGS/OPSG
+* https://github.com/dnotq/sn76489_audio
+* https://github.com/mamedev/mame/blob/master/src/devices/sound/sn76496.cpp
+* https://github.com/nukeykt/Nuked-PSG based on YM7101 decap 
 
-## Wokwi Projects
 
-Edit the [info.yaml](info.yaml) and change the wokwi_id to the ID of your Wokwi project. You can find the ID in the URL of your project, it's the big number after `wokwi.com/projects/`.
+## What is Tiny Tapeout?
 
-The GitHub action will automatically fetch the digital netlist from Wokwi and build the ASIC files.
+TinyTapeout is an educational project that aims to make it easier and cheaper than ever to get your digital designs manufactured on a real chip.
+
+To learn more and get started, visit https://tinytapeout.com.
 
 ## Verilog Projects