added some more shortcut mnemonics

README.md

@@ -163,6 +163,12 @@ specifications: here, it's `[selector] [value] [jumpaddr]` as opposed to
 `[value] [jumpaddr] [selector]`. This has been done for more convenient
 jump programming by selecting the condition as the first operand.
 
+### Shortcut mnemonics
+
+When writing MU8A assembly (see below), programmers are allowed to use
+some shortcut mnemonics for easier code readability. Those exist for all jump
+operations and several other opcodes.
+
 The shortcut mnemonics for the jump operations are as follows:
 
 * `jeq` is a shortcut to `jmp 0` (direct jump if equals to zero)
@@ -180,6 +186,17 @@ The shortcut mnemonics for the jump operations are as follows:
 * `ine` is a shortcut to `jmp 12` (indirect jump if not equals to zero)
 * `iuc` is a shortcut to `jmp 13 0` (indirect unconditional jump)
 
+The shortcut mnemonics for other operations are as follows:
+
+* `dia` is a shortcut to `cpy 0` (direct integer assignment)
+* `dva` is a shortcut to `cpy 1` (direct value assignment)
+* `iva` is a shortcut to `cpy 2` (indirect value assignment)
+* `exp` is a shortcut to `nel 0` (natural exponent)
+* `log` is a shortcut to `nel 1` (natural logarithm)
+* `sin` is a shortcut to `tri 0` (sine)
+* `cos` is a shortcut to `tri 1` (cosine)
+* `atn` is a shortcut to `tri 2` (arctangent)
+
 ### Port input and output
 
 For the commands 3 and 4, mu808 supports optional non-zero port numbers, where
@@ -243,7 +260,7 @@ the MU8A assembly file to convert it into a plain text based machine code
 representation:
 
 1. Remove all comments (starting with `;` until the end of the line).
-2. Replace all jump shortcuts according to the above mnemonics.
+2. Replace all jump/function shortcuts according to the above mnemonics.
 3. Record the current line number N (not counting completely empty lines),
    starting with 1.
 4. Split the line into space-delimited fields (1-based numbering as well).