Episode 85: C64 Breadbin Revisited

Kindly sponsored by my favourite $5 PCB fab, PCBWay https://pcbway.com/g/3DeAat ($5 off your first purchase)
Returning to my black screen C64, it now looks like the "working" memory I put in it wasn't. So let's investigate some RAM testers and figure out why.
And did fixing the RAM really fix the machine? Let's find out.
Plus, we fit a 6502-based CPU replacement.

Links for this episode:
1-bit DRAM Tester - https://athena.sieraybould.net/eBay/D...
DRAMArduino - https://forum.defence-force.org/viewt...
ATMega DRAM Tester - https://github.com/trevor-makes/avr-d...
Videos:
   • A better DRAMduino DRAM Tester Build  
   • Testing DRAM the RIGHT way  

MOS CPU replacement - https://monotech.fwscart.com/product/...
https://github.com/monotech/MOS_CPU_R...

My ebay store: https://www.ebay.co.uk/usr/timsretro

Check out these channels:
8-Bit Retro Refix: / @8BitRetroReFix
Captain Commodore: / @CaptainCommodore
Retro4u: / @Retro4u
Josip Retro Bits: / @JosipRetroBits

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00:00 - Introduction
05:47 - PCBWay
06:52 - Original RAM Tester
10:46 - DRAMArduino Tester
15:35 - AVR DRAM Tester
18:38 - 6502 CPU Adapter
32:09 - Power On Test
33:30 - BASIC ROM Replacement
35:13 - Let’s Check the 64C
37:44 - PLA Suspicion
40:57 - MOS PLA Test
42:22 - Modded GAL PLA Test