Join me as I upgrade a vintage Radio Shack TRS-80 Color Computer 3 from its stock 128K memory configuration to a full 512K RAM setup using the TRIAD SRAM upgrade board from Cloud-9. Originally released in 1986, the Tandy CoCo 3 remains one of the most advanced and beloved members of the TRS-80 Color Computer family thanks to its enhanced graphics, expanded memory support, and Motorola 6809E CPU architecture.
This video walks through the complete memory upgrade process including opening the CoCo 3 case, removing the original factory-installed memory chips, installing the Cloud-9 TRIAD 512K SRAM expansion board, replacing the original 128K badge with an upgraded 512K badge, and powering the system back on after the hardware modification is complete. Also discussed are future-proofing upgrades including motherboard recapping and replacing the stock Motorola 6809E processor with the faster and more capable Hitachi 63B09E CPU upgrade.
The TRS-80 Color Computer 3 became especially popular among hobbyists, programmers, and retro computing enthusiasts due to its expandability and active community support that continues decades later. Expanded memory configurations such as 512K opened the door for more advanced operating systems, games, demos, and productivity software beyond what the stock 128K system could originally support.
This entry is especially useful for viewers interested in Tandy computers, Radio Shack history, TRS-80 systems, retro hardware upgrades, and #SepTandy content. This video provides a detailed look at one of the most popular and worthwhile upgrades for the legendary CoCo 3.