minor changes

README.md

@@ -16,7 +16,6 @@ TyVM is a very barebone VM that has:
   - 16 opcodes
   - 10 registers
   - 3 condition flags
-
 #### Memory
 It has 2^16(=65,536) individual memory locations
 ```
@@ -68,11 +67,11 @@ enum {              // [name, 8-bit value]
 ```
 
 ### Logic
-- [10]    Load instruction from memory at program counter [RG_PC] address;
+- [10]  Load instruction from memory at program counter [RG_PC] address;
-- [20]    Increment RG_PC;
+- [20]  Increment RG_PC;
-- [30]    Read opcode for next instruction;
+- [30]  Read opcode for next instruction;
-- [40]    Perform instruction read in 30;
+- [40]  Perform instruction read in 30;
-- [50]    Goto 10;
+- [50]  Goto 10;
 
 ### Build
 On file "preprocessor.c" define the OS where you want to run TyVM. Comment out the following line if you want to build for Windows, otherwise it will build for Unix:

asm/asm_test.asm

@@ -1,26 +1,6 @@
 .ORIG x3000
-  AND R0, R0, #0
+LEA R0, HELLO_WORLD
-  AND R1, R1, #0
+PUTS
-  AND R3, R3, #0
-  LEA R0, NUM
-  ADD R1, R1, R0
-  LD R2, ASCII
-
-FOR_LOOP
-  LDR R4, R1, #0
-  BRz END_LOOP
-  ADD R4, R4, R2
-  STR R4, R1, #0
-  ADD R1, R1, #1
-  BRnzp FOR_LOOP
-END_LOOP
-
-  PUTs
 HALT
-
+HELLO_STR .STRINGZ "Hello World!"
-ASCII .fill  x30
-NUM   .fill  x01
-      .fill  x02
-      .fill  x03
-      .fill  x04
 .END

asm/helloworld

@@ -0,0 +1,26 @@
+.ORIG x3000
+  AND R0, R0, #0    ; Clear R0
+  AND R1, R1, #0    ; Clear R1
+  AND R3, R3, #0    ; Clear R3
+  LEA R0, NUM       ; pointer [mem]NUM
+  ADD R1, R1, R0    ; Store the pointer address of R0 into R1
+  LD R2, ASCII      ; load the ascii offset into R2
+
+FOR_LOOP
+  LDR R4, R1, #0    ; load the contents of mem address of R1 into R4
+  BRz END_LOOP
+  ADD R4, R4, R2    ; Add our number to the ASCII offset
+  STR R4, R1, #0    ; Store the new value in R4 into [mem] address R1
+  ADD R1, R1, #1    ; move our memory pointer down one
+  BRnzp FOR_LOOP    ; loop again until we get an x00 char
+END_LOOP
+
+  PUTs              ; print our string starting from [mem]address in R0
+HALT                ; Trap x25
+
+ASCII .fill  x30    ; Our ASCII offset
+NUM   .fill  x01    ; Our Number to print
+      .fill  x02
+      .fill  x03
+      .fill  x04
+.END