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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