Demonstrating the various RAM Expansion Units (REUs) available for the Commodore 64 and 128, including how to program them to help in analysis of the output of the SID's noise waveform. Become a patron: https://patreon.com/8BitShowAndTell One-time donation: https://paypal.me/8BitShowAndTell An article I wrote about REU programming many years ago for Loadstar Letter: http://psw.ca/robin/?page_id=182 More info about the C64 game Sam's Journey: https://www.knightsofbytes.games/samsjourney More info about Jim Brain's X-Pander 3 expansion port... expander: http://www.go4retro.com/products/x-pander-3/ The memory map images I used in this video are from the Commodore 64 Programmer's Reference Guide, which you should be able to find in electronic form easily with a search. Some images also from the "Commodore 64 1764 Ram Expansion Module User's Guide": https://archive.org/details/Commodore_64_1764_Ram_Expansion_Module_Users_Guide_1986_Commodore/page/n9/mode/1up Stand-alone video of A Procedurally Generated Christmas Song: https://www.youtube.com/watch?v=5hZaQNUfSNc Follow me on Twitter: https://twitter.com/BedfordLvlExp Check out my podcast Growing Up '80s: https://thecouch.website/category/gu80s/ Index: 0:00 Happy New Year intro 0:56 Snowflake Randomness & LFSRs 5:37 Pulling random values from SID 8:30 Introducing RAM Expansion Unit: REU & Expanders 15:26 Sam's Journey - uses REU on NTSC 18:26 Exploring REU memory with Super Snapshot Monitor 20:29 Programming the REU to do a transfer 28:42 Executing and analyzing the REU transfer from SID 35:00 Back to the random snowflakes 37:52 A Procedurally Generated Christmas Song