From df4145af824e55c2ad86f5b875ee92f88fa1d9bc Mon Sep 17 00:00:00 2001
From: Cassie Jones <code@witchoflight.com>
Date: Fri, 17 Jan 2020 03:51:09 -0500
Subject: [PATCH] Minor ISA changes

---
 isa.txt | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/isa.txt b/isa.txt
index 58fbdd3..98bada1 100644
--- a/isa.txt
+++ b/isa.txt
@@ -1,6 +1,6 @@
 4 16-bit general-purpose registers r0, r1, r2, r3
 
-ALU2: trap nope add sub and or xor
+ALU2: misc ???? add sub addpc and or xor
 ALU1: inc dec neg comp
 ALUA: add
 ALUI: lsl lsr asr rol clr set tog ext
@@ -8,15 +8,16 @@ ALUI: lsl lsr asr rol clr set tog ext
 7654_3210
 --------- --------
 0000_0000          => HALT: halt
-0001_0000          => NOPE: nope
+0000_0001          => NOPE: nope
+0000_xxxx          => RESERVED
 0ooo_aabb          => ALU2: a = a op b
 1000_aabb          => JALR: jalr ra  # when a == b
 1000_aabb          => MOVE: a = b    # when a != b
 1001_aaoo          => ALU1: a = op a
 101f_aabb          => LDST: a <-> [b]
 110o_aabb oiiiiiii => BRNC: branch if a op b  # when a != b
-1100_0000 iiiiiiii => JMPI: jump offset
-1101_aabb fiiiiiii => LSI0: a <-> [imm * 2]
+1100_0000 iiiiiiii => JUMP: jump offset
+1101_aabb fiiiiiii => LSI0: a <-> [imm * 2]  # a == b
 1110_aa00 iiiiiiii => ALUA: a = a + imm
 1110_aa01 ooooiiii => ALUI: a = a op imm
 1110_aa10 iiiiiiii => LDLI: lo(a) = imm
-- 
2.43.2