How did they do virtual memory in the 80s?

An exploration of the Tandy Color Computer 3, and how it allowed a CPU that could only address 64K of RAM, actually access megabytes of physical RAM. We discuss the GIME's MMU, how to program it, sample code to write to 2 megs of physical RAM, and trace through it in MAME's debugger. Download the code shown in this video: https://cocotownretro.wordpress.com/2... Previous video on how the CoCo 2 accesses 64K of RAM:    • CoCo 2: The 64K problem (and how to deal) ...   For more information: "Understanding and Using the MMU" by Allen C. Huffman https://www.cocopedia.com/wiki/index.... NitrOS-9 EOU Level 2 Technical Reference Manual v0.21 (L. Curtis Boyle) https://colorcomputerarchive.com/repo... Inside OS-9 Level II (1987)(Kevin Darling) https://colorcomputerarchive.com/repo... Assembly Language Programming for the CoCo3 (1987) (Laurence A Tepolt) https://colorcomputerarchive.com/repo... Super Extended BASIC Unravelled II https://colorcomputerarchive.com/repo... 00:00 Intro 01:49 How to control the MMU 08:43 Sample code to write to 2 Megs 13:02 MAME: View more than just logical memory 15:37 Start stepping