Commodore 1764 RAM Expansion Restoration & Upgrade

I'm restoring a Commodore 1764 RAM Expansion Unit and also upgrade it from 256k to 512k. // Kindly sponsored by PCBWay. https://www.pcbway.com/ REU 1764 Test/Demo disk image download: https://archive.org/details/1764_Test_Demo_Disk_19xx_Commodore 17XX REU Mem Tester disk image download: https://commodore.software/downloads/download/148-c64-testers/7998-commodore-17xx-reu-tester Sonic the Hedgehog C64 Fan Remake download: https://csdb.dk/release/?id=212523 IC Leg Straightener*: US: https://amzn.to/3Gomh2Q UK: https://amzn.to/3Gsnm9E DE: https://amzn.to/3AVdN1N ADDENDUM: This document mentions a 390 Ohms resistor in position R4 (top left of the PCB) that is present in the original 1750. Possibly to "tweak" the signals slightly for the C128. I didn't run into any issues without it (yet), just mentioning this for completeness: https://commodore.software/downloads/download/202-1764-ram-expansion/1344-1764-ram-expansion-upgrade-doc TIME STAMPS: 0:00 Introduction 1:43 Inspecting the Expansion 3:00 Sponsor Message 3:26 A Look inside 9:45 Cleaning the PCB 11:34 Cleaning the plastic parts 12:18 First test run 18:58 Scrubbing case parts 19:54 512k Upgrade 27:52 Testing the mod 29:57 Repairing the case 32:06 Reassembly 33:42 Final test run 34:22 Thank you & good night ----------------------------------------­------ MUSIC by FOCUS 10 https://focus10music.bandcamp.com EQUIPMENT AND TOOLS I USE: https://kit.co/janbeta * MERCHANDISE: https://janbeta.creator-spring.com TWITTER: https://twitter.com/thejanbeta PATREON: https://patreon.com/janbeta KO-FI: https://ko-fi.com/janbeta WEBSITE: https://www.janbeta.net TWITCH: https://www.twitch.tv/thejanbeta YT CHANNEL MEMBERSHIP: https://www.youtube.com/channel/UCftUpOO4h9EgH0eDOZtjzcA/join Thanks for watching! This video was sponsored by PCBWay. * Stuff marked with "*" contains affiliate links. You don't pay anything extra and I get a little commission from everything you buy through the links (even if you buy something different there). #JanBeta #Commodore #REU1764 #PCBWay