Sample Sequencer Prototype for SEGA Master System - ROM and Source Code

Someone asked about this on YouTube, so I'm posting the code and ROM. It will be good to come back to this, actually.

Download ROM here: http://milkcrate.com.au/_other/downloads/ROMs/sample_sequencer_prototype.sms

Download source code here: http://milkcrate.com.au/_other/downloads/ROMs/sample_sequencer_prototype.txt

Demo video: