diff --git a/vm.md b/vm.md
index 5cdbfd5..f230f56 100644
--- a/vm.md
+++ b/vm.md
@@ -23,7 +23,8 @@ CPU registers are addressed by a value between 0-63 (6 bits). All registers are
 * SP - Stack pointer
 * FP - Frame pointer
 * FLAGS - CPU flags
-* (9 unused registers)
+* NULL - Always zero for reading and will never change after writing.
+* (8 unused registers)
 * STATUS - Generic status code
 * R0-R49
 
@@ -43,7 +44,6 @@ CPU flags are addressed by bit index, going from right to left.
 
 ## Register ideas
 
-* NULL - a register that will always be zero for reading and will not change after writing.
     * Other possible names: Z, NIL
 
 # Instructions
@@ -269,7 +269,7 @@ wrapping around to 0.
      opcode              reg1    unused
     /                  /        /
     +----------------------------------------+
-    | 0001000000000000 | ...... | XXXXXXXXXX |
+    | 0001000100000000 | ...... | XXXXXXXXXX |
     +----------------------------------------+
     ```
 
@@ -287,7 +287,7 @@ wrapping around to 0.
      opcode              reg1    unused
     /                  /        /
     +----------------------------------------+
-    | 0001000000000001 | ...... | XXXXXXXXXX |
+    | 0001000100000001 | ...... | XXXXXXXXXX |
     +----------------------------------------+
     ```
 * Jnz
@@ -304,7 +304,7 @@ wrapping around to 0.
      opcode              reg1    unused
     /                  /        /
     +----------------------------------------+
-    | 0001000000000002 | ...... | XXXXXXXXXX |
+    | 0001000100000002 | ...... | XXXXXXXXXX |
     +----------------------------------------+
     ```
 
@@ -398,7 +398,7 @@ wrapping around to 0.
      opcode
     /
     +------------------+
-    | 0010011000000000 |
+    | 1111000000000000 |
     +------------------+
     ```
 * Nop
@@ -410,7 +410,7 @@ wrapping around to 0.
      opcode
     /
     +------------------+
-    | 0010011000000001 |
+    | 1111000000000001 |
     +------------------+
     ```
 
@@ -499,6 +499,4 @@ A VM must provide support for the following meta-values:
 
 * Interrupts
 * MMIO regions
-* Execution pipeline
-    * Helps to define when certain side effects happen (e.g. when the IP increments)
 * Paging?