From b5300d5ac415c8db67eaad86cb2624f192d7dd15 Mon Sep 17 00:00:00 2001
From: Sasha Koshka <sashakoshka@tebibyte.media>
Date: Mon, 31 Oct 2022 15:54:09 -0400
Subject: [PATCH] I forgot what exactly I changed

---
 marcie.go    | 10 ++++++++++
 masm/main.go |  1 +
 2 files changed, 11 insertions(+)

diff --git a/marcie.go b/marcie.go
index 4a177a8..ba6ebb7 100644
--- a/marcie.go
+++ b/marcie.go
@@ -31,6 +31,7 @@ const (
 	JUMPI    Opcode = 0xC
 	LOADI    Opcode = 0xD
 	STOREI   Opcode = 0xE
+	MOD      Opcode = 0xF
 )
 
 // Instruction provides a convenient way to create an instruction word
@@ -158,6 +159,15 @@ func (machine *Machine) Execute (offset int16) (err error) {
 			// Store indirect: Use X the value at X as the address
 			// of where to store the value
 			machine.memory[memoryValue] = machine.accumulator
+			
+		case MOD:
+			// Set AC to the remainder of AC divided by the value at
+			// X
+			if memoryValue == 0 {
+				machine.accumulator = 0
+			} else {
+				machine.accumulator %= memoryValue
+			}
 
 		default:
 			err = ErrorUnknownInstruction
diff --git a/masm/main.go b/masm/main.go
index 1e09fca..225a11d 100644
--- a/masm/main.go
+++ b/masm/main.go
@@ -38,6 +38,7 @@ var mnemonics = map[string] marcie.Opcode {
 	"jumpi":    marcie.JUMPI,
 	"loadi":    marcie.LOADI,
 	"storei":   marcie.STOREI,
+	"mod":      marcie.MOD,
 	"org":      ORG,
 }