e

3 years ago · cc1275a923
parent 8a275107f6
commit cc1275a923
1 changed files with 60 additions and 17 deletions
--- a/assemblyone.txt
+++ b/assemblyone.txt
@ -1,22 +1,65 @@
-Instruction set:
-    MOV =

-    ALU = --XXXXXX
-        ADD =
-        SUB
-        OR =
-        XOR =
-        AND =
-        NOT =

+Instruction layout in RAM
+OPCODE   A        B
+XXXXXXRR;AAAAAAAA;BBBBBBBB
+      AB
+R Indicates the value stored in A/B is a register

-    ALU INV = --XXXXXX
-        Same as ALU
+Opcodes:

-    IMM =
+    ALU = 1XXXXY--
+        If Y is 1 invert output
+        ADD = -1000Y-- Add A to B output to ACC
+        SUB = -0100Y-- Sub A from B output to ACC
+        OR  = -1100Y-- OR A and B output to ACC
+        XOR = -0010Y-- XOR A and B output to ACC
+        AND = -1010Y-- AND A and B output to ACC

-    JMP =
-    JNZ =
-    JGZ =
-    JLZ =
-    JEZ =
+    MOV = 010000-- Move A to B
+
+    JMP = 011000-- Jump to A ignore B(?)
+    A    = 00100000
+    JNZ = 000100-- Jump if A is not zero to B
+    JGZ = 010100-- Jump if A is greater than zero to B
+    JLZ = 001100-- Jump if A is less than zero to B
+    JEZ = 011100-- Jump if A is zero to B
+
+    NOP = 001010-- Nothing!
+
+    DBL = 000010-- Blink a light
+    DBB = 010010-- Beep a beeper
+
+    HLT = 000001-- Haha die
+
+Registers:
+
+    RAM = 1XXXXXXX R/W
+        -0000000 | -1111111
+
+    ACC  = 01000000 R     8bit
+    A    = 00100000 R/W   8bit
+    B    = 01100000 R/W   8bit
+    C    = 00010000 R/W   8bit
+
+    Special:
+        ZERO = 00000000 R   8bit
+        FULL = 00000001 R   8bit
+        DBGO = 00000010 W Debug output  8bit
+        DBGI = 00000011 R Debug input   8bit
+        PGCR = 00000100 R/W Program Counter 7bit
+
+Example program (Human readable + binary):
+                OPCODE   A        B
+    MOV 1 A     01000001;00000001;00100000
+    MOV 1 B     01000001;00000001;01100000
+    MOV -100 C  01000001;11100100;00010000
+    MOV A DBGO  01000011;00100000;00000010
+lop:            00101000;00000000;00000000
+    ADD A B     11000011;00100000;01100000
+    MOV A B     01000011;00100000;01100000
+    MOV ACC A   01000011;01000000;00100000
+    MOV A DBG0  01000011;00100000;00000010
+    ADD A C     11000011;00100000;00010000
+    JLZ ACC lop 00110010;01000000;00000101
+    HLT         00000100;00000000;00000000