From 2c18b593abaa7c56d8987f9e31f1339f08735c9f Mon Sep 17 00:00:00 2001
From: Garritt McCune <glmccune@gmail.com>
Date: Fri, 7 Jan 2022 21:37:32 +0000
Subject: [PATCH] Expanded the assembly test code partially, and added some
 ideas on how to encode instructions.

---
 misc/test.asm | 41 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

diff --git a/misc/test.asm b/misc/test.asm
index 65f83a5..ee42c60 100644
--- a/misc/test.asm
+++ b/misc/test.asm
@@ -1,6 +1,45 @@
 ; comments are ignored
 ; This is a very simple test file for an assemblier.
+.db msg "Hello, world!"
+
+copy r1, msg
+copy r2, 0
+.loop:
+    cmp r1, 0
+    jz .loop
+    add r1, 1
 mov r1, 5   ; move the immediate value 5 into r1
 add r1,5   ; add 5 into r1
 int 21      ; maybe that will call some string drawing BIOS-like routine
-ret
\ No newline at end of file
+ret
+; form  YYYY YYXX - Y opcode, X modifier
+; nop:  0000 0000
+; copy: 0000 01XX
+; add:  0000 10XX - | Perhaps running these will clear any overflow
+; addc: 0000 11XX - | or under flow flags if no errors occur.
+; sub:  0001 00XX - | jz should clear the zero flag.
+; subb: 0001 01XX - |
+; call: 0001 1100 - Always call [imm16]
+; jmp:  0010 0000 - Always jmp [imm16] (No short jumps)
+; jz:   0010 0100 - Always jz [imm16] (no short jumps)
+; cmp:  0010 11XX
+; push: 0011 11XX -| pop / push imm16/imm8 | reg
+; pop:  0100 00XX -|
+
+; 
+; imm8 imm16 reg
+; mov reg, imm16|reg
+; add reg, imm16|reg
+; int imm16
+; db [label] 'String data here' (Null byte is added implicatly by the assemblier)
+; 
+; enum Type {
+;   Op,
+;   Reg,
+;   Imm16,
+;   Imm8
+; }
+; struct Token {
+;   enum Type type;
+;   char *value;
+; }
\ No newline at end of file