diff --git a/doc/memory_mapper.drawio b/doc/memory_mapper/memory_mapper.drawio
similarity index 76%
rename from doc/memory_mapper.drawio
rename to doc/memory_mapper/memory_mapper.drawio
index 296e767..60b7619 100644
--- a/doc/memory_mapper.drawio
+++ b/doc/memory_mapper/memory_mapper.drawio
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diff --git a/doc/memory_mapper/memory_mapper.drawio.png b/doc/memory_mapper/memory_mapper.drawio.png
new file mode 100644
index 0000000..c656da5
Binary files /dev/null and b/doc/memory_mapper/memory_mapper.drawio.png differ
diff --git a/doc/memory_mapper/memory_mapper.md b/doc/memory_mapper/memory_mapper.md
new file mode 100644
index 0000000..6f216ed
--- /dev/null
+++ b/doc/memory_mapper/memory_mapper.md
@@ -0,0 +1,70 @@
+# Memory Mapper
+
+## Overview
+
+The memory mapper gives expands the CPU's address space from 16 bits to 25.
+It can be expanded to be 28 bits, but only 25 are needed to access all of
+sdram.
+
+Its architecture is show below:
+
+![memory_mapper.drawio.png](memory_mapper.drawio.png)
+
+There are 32 16 bit registers: One for each 4k page in the virtual address
+space. The memory mapper is always enabled, but at reset it is identity
+mapped, i.e. register _n_ will be reset to value _n_.
+
+## Interface
+
+The Memory mapper is composed of 32 identical 16 bit mapping registers
+
+The chip select should be calculated based on the virtual address. If not,
+it will be possible for the CPU to map away access to the mapper, at which
+point it is impossible to change the mappings without a reset.
+
+## Registers
+
+### Register Map
+
+| Address 	| Read     	    | Write      	|
+|---------	|-------------- |--------------	|
+| 00       	| MM0 Low   	| MM0 Low       |
+| 01       	| MM0 High  	| MM0 High      |
+| 02       	| MM1 Low   	| MM1 Low       |
+| 03       	| MM1 High  	| MM1 High      |
+| 04       	| MM2 Low   	| MM2 Low       |
+| 05       	| MM2 High  	| MM2 High      |
+| 06       	| MM3 Low   	| MM3 Low       |
+| 07       	| MM3 High  	| MM3 High      |
+| 08       	| MM4 Low   	| MM4 Low       |
+| 09       	| MM4 High  	| MM4 High      |
+| 0A       	| MM5 Low   	| MM5 Low       |
+| 0B       	| MM5 High  	| MM5 High      |
+| 0C       	| MM6 Low   	| MM6 Low       |
+| 0D       	| MM6 High  	| MM6 High      |
+| 0E       	| MM7 Low   	| MM7 Low       |
+| 0F       	| MM7 High  	| MM7 High      |
+| 10       	| MM8 Low   	| MM8 Low       |
+| 11       	| MM8 High  	| MM8 High      |
+| 12       	| MM9 Low   	| MM9 Low       |
+| 13       	| MM9 High  	| MM9 High      |
+| 14       	| MM10 Low  	| MM10 Low      |
+| 15       	| MM10 High 	| MM10 High     |
+| 16       	| MM11 Low  	| MM11 Low      |
+| 17       	| MM11 High 	| MM11 High     |
+| 18       	| MM12 Low  	| MM12 Low      |
+| 19       	| MM12 High 	| MM12 High     |
+| 1A       	| MM13 Low  	| MM13 Low      |
+| 1B       	| MM13 High 	| MM13 High     |
+| 1C       	| MM14 Low  	| MM14 Low      |
+| 1D       	| MM14 High 	| MM14 High     |
+| 1E       	| MM15 Low  	| MM15 Low      |
+| 1F       	| MM15 High 	| MM15 High     |
+
+### MMn Low
+
+Low memory map data. Becomes bits [19:12] of physical address.
+
+### MMn High
+
+High memory map data. Becomes bits [27:20] of physical address.
\ No newline at end of file