Yamaha S3527
This page was last modified 13:45, 7 October 2021 by Mars2000you. Based on work by Lintweaker and Gdx and others.


Yamaha S3527

The Yamaha S3527 is a chipset called MSX-SYSTEM with the following features:

  • a Yamaha YM2149 PSG-sound chip, compatible with a General Instrument AY-3-8910 (for sound, joystick ports, etc)
  • PPI: backward compatible with the Intel i8255 (primary and some secondary slot selection, keyboard (keypad included), cassette interface, etc)
  • other MSX functions: DRAM/ROM control, printer interface, etc.
  • 100 pins


  • the S3527 is used in several MSX2 machines. In case of RTC and optional MSX2 features, these are implemented using additional IC's.
  • it has been preceded by the X3527, used in the Yamaha CX11 computer
  • Undocumented feature: All 3 PPI ports (0a8-0aah) and control port (0abh) are mirrored to I/O ports 0ac-0afh. This can be used to determine if a machine has an MSX-ENGINE.

Computers with the S3527