add p2

src/Proyecto 2, 2do semestre/RUN.bat

@@ -0,0 +1,3 @@
+cd ASM\P2
+OUT.com
+cd c:\

src/Proyecto 2, 2do semestre/juan.bat

@@ -0,0 +1,6 @@
+cd ASM\JUANRA\PROYEC~1\
+proyecto.com
+cd ..
+cd ..
+cd ..
+cls

src/Proyecto 2, 2do semestre/p2.bat

@@ -0,0 +1,4 @@
+nasm2 ASM\P2\p2.asm -o ASM\P2\out.com
+cd ASM\P2
+OUT.com
+cd c:\

src/Proyecto 2, 2do semestre/snake.asm

@@ -0,0 +1,219 @@
+;Snake!
+[BITS 16]
+
+TOTAL_SEGMENTS equ 0x09
+
+section .bss
+  x_coord   RESW TOTAL_SEGMENTS ; [x_coord] is the head, [x_coord+2] is the next cell, etc.
+  y_coord   RESW TOTAL_SEGMENTS ; Same here
+  t1        RESB 2
+  t2        RESB 2
+  enabled   RESB 2
+  x_apple   RESB 2
+  y_apple   RESB 2
+  
+section  .text
+  global_start 
+
+_start:
+  CALL SetVideoMode
+  CALL SetInitialCoords
+  CALL ClearScreen
+  CALL Debug
+  CALL ListenForInput
+
+SetVideoMode:
+  MOV AH, 00h
+  MOV AL, 13h
+  INT 10h
+  RET
+
+ClearScreen:
+  MOV CX, 0x00
+  MOV DX, 0x00
+  MOV AL, 0x00
+  MOV BH, 0x00
+  MOV AH, 0x0C
+  .x_loop_begin
+   MOV CX, 0x00
+   .y_loop_begin
+    INT 0x10
+    INC CX
+    CMP CX, 0x140
+    JNAE .y_loop_begin
+   .y_loop_end
+   INC DX
+   CMP DX, 0xFF
+   JNAE .x_loop_begin
+  .x_loop_end
+  RET 
+
+SetInitialCoords:
+  MOV AX, 0x0F ; Initial x/y coord
+  MOV BX, 0x00
+  MOV DX, TOTAL_SEGMENTS
+  ADD DX, DX
+
+  .initialize_loop_begin
+   MOV [x_coord+BX], AX
+   MOV [y_coord+BX], AX
+   ADD BX, 0x02
+   CMP BX, DX
+   JNE .initialize_loop_begin
+  
+  MOV AX, 0x00
+  MOV [t1]       , AX
+  MOV [t2]       , AX
+  MOV AX, 2
+  MOV [enabled]  , AX
+
+  CALL RandomNumber
+  MOV [x_apple], AX
+  CALL RandomNumber
+  MOV [y_apple], AX
+  RET
+
+ListenForInput:  ;Repeatedly check for keyboard input
+  MOV AH, 0x00 ; Set AH to 0 to lock when listening for key
+  MOV AL, 0x00 ; Set last key to 0
+  INT 0x16   ; Listen for a keypress, save to register AL
+  
+  CALL InterpretKeypress
+
+  CALL ListenForInput
+  RET
+
+InterpretKeypress:
+  CMP AL, 0x77
+  JE .w_pressed
+
+  CMP AL, 0x61
+  JE .a_pressed
+
+  CMP AL, 0x73
+  JE .s_pressed
+
+  CMP AL, 0x64
+  JE .d_pressed
+  CALL Debug
+
+  RET ; Invalid keypress, start listening again
+
+  .w_pressed
+  MOV AX, [x_coord]
+  MOV BX, [y_coord]
+  DEC BX
+  JMP .after_control_handle
+
+  .a_pressed
+  MOV AX, [x_coord]
+  MOV BX, [y_coord]
+  DEC AX
+  JMP .after_control_handle
+
+  .s_pressed
+  MOV AX, [x_coord]
+  MOV BX, [y_coord]
+  INC BX
+  JMP .after_control_handle
+  
+  .d_pressed
+  MOV AX, [x_coord]
+  MOV BX, [y_coord]
+  INC AX
+ 
+  .after_control_handle
+  MOV [t1], AX
+  MOV [t2], BX
+  CALL CheckAppleCollision
+  CALL ShiftArray
+  CALL DrawSnake
+  CALL DrawApple
+  RET
+
+CheckAppleCollision:
+  CMP AX, [x_apple]
+  JNE .no_collision
+
+  CMP BX, [y_apple]
+  JNE .no_collision
+  
+  MOV AX, [enabled]
+  INC AX
+  MOV [enabled], AX
+  
+  CALL RandomNumber
+  MOV [x_apple], AX
+  CALL RandomNumber
+  MOV [y_apple], AX
+
+  .no_collision
+  RET
+
+DrawApple:
+  MOV CX, [x_apple]
+  MOV DX, [y_apple]
+  MOV AL, 0x0C
+  CALL DrawPixel
+  RET
+
+DrawSnake:
+  CALL ClearScreen
+  MOV BX, 0x00
+  MOV AL, 0x0A
+  MOV [t1], BX
+  .draw_snake_loop_begin
+   CMP [enabled], BX
+   JBE .skip
+   MOV [t1], BX
+   ADD BX, BX
+   MOV CX, [x_coord+BX]
+   MOV DX, [y_coord+BX]
+   CALL DrawPixel
+   MOV BX, [t1]
+   INC BX
+   JMP .draw_snake_loop_begin
+  
+  .skip
+  RET
+
+ShiftArray:
+  MOV BX, TOTAL_SEGMENTS
+  DEC BX
+  ADD BX, BX
+  .loop_begin
+   ADD BX, -2
+   MOV DX, [x_coord+BX]
+   MOV CX, [y_coord+BX]
+   ADD BX, 2
+   MOV [x_coord+BX], DX
+   MOV [y_coord+BX], CX
+   ADD BX, -2
+   CMP BX, 0x00
+   JNE .loop_begin
+  MOV DX, [t1]
+  MOV [x_coord], DX
+  MOV DX, [t2]
+  MOV [y_coord], DX
+  RET
+
+DrawPixel:
+  MOV AH, 0x0C     ; Draw mode
+  MOV BH, 0x00     ; Pg 0
+  INT 0x10         ; Draw
+  RET
+
+RandomNumber:
+  RDTSC
+  AND EAX, 0xF
+  RET
+
+Debug:
+  MOV AL, 0x0A
+  MOV CX, 0x00
+  MOV DX, 0x00
+  CALL DrawPixel
+  RET
+
+TIMES 510 - ($ - $$) db 0  ;Fill the rest of sector with 0
+DW 0xAA55      ;Add boot signature at the end of bootloader

src/Proyecto 2, 2do semestre/snake.bat

@@ -0,0 +1,4 @@
+nasm2 ASM\P2\snake.asm -o ASM\P2\out.com
+cd ASM\P2
+OUT.com
+cd c:\