diff -r 47ee91579133 -r 835bd4559e5c c++/rgb-assembler/commands/IncrementDecrement.h
--- a/c++/rgb-assembler/commands/IncrementDecrement.h	Sun Dec 24 00:08:55 2017 +0100
+++ b/c++/rgb-assembler/commands/IncrementDecrement.h	Sun Dec 24 00:12:58 2017 +0100
@@ -14,8 +14,9 @@
 class IncrementDecrement : public Command {
 public:
 
-	IncrementDecrement(const bool increment) {
+	IncrementDecrement(const bool increment, octet_t change) {
 		this->increment = increment;
+		this->change = change;
 	}
 
 	void process(octet_t* memory, address_t& index) override {
@@ -23,12 +24,13 @@
 		address_t address_r = address;
 		address_t address_w = address_r;
 		octet_t value = read<octet_t>(memory, address_r);
-		value = increment ? value + 1 : value - 1;
+		value = increment ? value + change : value - change;
 		write<octet_t>(memory, address_w, value);
 		wprintf(L"%sCREMENT %*d → %02X\n", (increment ? "IN" : "DE"), 5, address, value);
 	}
 private:
 	bool increment;
+	octet_t change;
 
 };