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

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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

Видео Commodore 1764 RAM Expansion Restoration & Upgrade канала Jan Beta