Update README.md

README.md

@@ -10,6 +10,98 @@ message:
 ```
 
 
+## Problem??
+
+
+I've included a broken ASM program, try to fix it with the error messages from the compiler, and let me know where i can improve the messages
+
+
+```asm
+
+main:
+    ldw a, 0xFF     ;  load 255 to A register, Unused
+    str a, 0x0F      ;  will cause an error because its writing to program memory
+                    ;  You will have to make the address bigger than the program
+    int 0x00        ;  interupt to print a register to terminal as a char (debug)
+    
+    ldw a, 0        ; will be the graphics mode
+    str a, 0xF0     ; copy A register to memory address   
+    
+    ldw a, 800      ; screen width
+    str a, 0xF1     ; copy A register to memory address     
+    
+    ldw a, 600      ; screen height
+    str a, 0xF2     ; copy A register to memory address
+    jsr _init_graphics_mode
+    
+    
+    
+init_graphics_mode:
+    push a
+    push b
+    push c
+    
+    ldw g, 0xFF ; This is never used
+    
+    ldr a, 0xF0 ; copy data from memory address to register 'A'
+    ldr b, 0xF1 ; copy data from memory address to register 'B'
+    ldr c, 0xF2 ; copy data from memory address to register 'C'
+    
+    int 0x70    ; all interupts in 0x70 - 0x7F are for graphics, 
+                ; only 0x70 to 0x72 are implemented
+                
+    pop b
+    pop a
+    
+    ret
+
+```
+
+
+## Interupts
+
+
+0x00 -> print register a as char
+0x01 -> print register a as int
+0xFF -> Halt
+0xFE -> Error Interupt
+0xF6 -> put keycode of currently pressed key in A register
+        and but a value (bool)(0 or 1) into b register to
+        indicate whether it is the first time this key has been 
+        pressed.
+0x70 -> Init graphics, 
+        (A) mode
+        (B) X resolution
+        (C) Y Resulution
+0x71 -> Set Pixel, (bitmap mode)
+        (A) Color (0x000000 to 0xFFFFFF)
+        (B) x position
+        (C) y position
+0x72 -> Set Char, (Text Mode)
+        (A) Character Code
+        (B) Cursor Position 
+        (C) Color (0x000000 to 0xFFFFFF)
+
+ ! ALLL FILESYSTEM DRIVE NUMBER ARE LOCAL FILES !
+ drive( drive number (0 to 9)).bin
+ "drive8.bin"
+ drive number  -> ( 0 to 9 )
+ sector number -> ( 0 to 15 )
+ byte offset   -> ( 0 to 254 )
+
+0x80 -> read byte from disk
+         (A) drive number
+         (B) sector number 
+         (C) byte offset
+         moves output to A register
+0x81 -> write byte from disk
+        (A) drive number
+        (B) sector number 
+        (C) byte offset
+        (D) byte to write
+
+
+        
 ## Example error messages for the ASM Compiler
 ![image](https://github.com/user-attachments/assets/f50d5d51-dfb8-46a8-b3e3-c762d033c2f1)
 ![image](https://github.com/user-attachments/assets/fd7f2477-a4c6-46c3-afb9-9d47c5daa159)