diff --git a/mini-asm.md b/mini-asm.md
new file mode 100644
index 0000000..1b5e953
--- /dev/null
+++ b/mini-asm.md
@@ -0,0 +1,43 @@
+GS+ Pro Extreme Max HD Performance Edition includes a sweet-16 mini assembler as well as a 65816 mini assembler.
+
+## Sweet-16
+From the Debug shell, enter `!!` to enter the sweet-16 mini asembler.
+
+Enter `^D` or a blank line to exit back to the debug shell.
+
+Lines consist of an optional address, an opcode, and operands.
+
+All numbers are hexadecimal.
+The `*` operand is the current address/PC.  +/- offsets may also be applied. 
+
+Registers are named `R0`-`R15` (decimal). `ACC`, `PC` and `SR` aliases are also valid for `R0`, `R15`, and `R14`, respectively.
+
+### Examples
+
+0300: set R1, #0300
+      ld @R1
+      br *-3
+      
+## 65816
+From the Debug shell, enter `!` to enter the sweet-16 mini asembler.
+
+Enter `^D` or a blank line to exit back to the debug shell.
+
+Lines consist of an optional address, an opcode, and operands.
+  
+All numbers are hexadecimal.
+The `*` operand is the current address/PC.  +/- offsets may also be applied.
+
+The M/X bits are automatically set via `REP`/`SEP` instructions.  Additionally, the `long` and `short` directives
+may be used to set them explicitly.
+
+    long mx
+    short m
+ 
+Toolbox, GS/OS, ProDOS-16, and P8 MLI macros are auto generated from the NiftyList.Data file.
+
+    _NewHandle
+    _OpenGS 123456
+    
+
+