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SET PC, init
:code_start
dat ">++++++++++>+>+["
dat "[+++++[>++++++++<-]>.<++++++[>--------<-]+<<<]>.>>["
dat "[-]<[>+<-]>>[<<+>+>-]<[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-"
dat "[>+<-[>+<-[>+<-[>[-]>+>+<<<-[>+<-]]]]]]]]]]]+>>>"
dat "]<<<"
dat "]"
:code_end

:screen_hwi dat 0
:kb_hwi dat 1
:screen_start dat 0x8000

:screen_cursor dat 0

:inst_dec_pointer dat 60
:inst_dec_value dat 45
:inst_inc_pointer dat 62
:inst_inc_value dat 43
:inst_input dat 44
:inst_jump_backward dat 93
:inst_jump_forward dat 91
:inst_output dat 46

:init

SET A, 0
SET B, [screen_start]
HWI [screen_hwi]

SET A,0
HWI [kb_hwi]

SET PC, start

:start

JSR build_jump_map

SET A, code_start
SET C, mem_start

:emu_loop
  IFE A, code_end
    SET PC, emu_loop_exit
  JSR emu_step
 
  ADD A, 1
  SET PC, emu_loop

  :emu_loop_exit
    SUB PC, 1

:emu_step
  IFN [A], [inst_dec_pointer]
    SET PC, end_inst_dec_pointer
    JSR emu_handle_inst_dec_pointer
    SET PC, emu_step_exit
    :end_inst_dec_pointer

  IFN [A], [inst_dec_value]
    SET PC, end_inst_dec_value
    JSR emu_handle_inst_dec_value
    SET PC, emu_step_exit
    :end_inst_dec_value

  IFN [A], [inst_inc_pointer]
    SET PC, end_inst_inc_pointer
    JSR emu_handle_inst_inc_pointer
    SET PC, emu_step_exit
    :end_inst_inc_pointer

  IFN [A], [inst_inc_value]
    SET PC, end_inst_inc_value
    JSR emu_handle_inst_inc_value
    SET PC, emu_step_exit
    :end_inst_inc_value

  IFN [A], [inst_output] 
    SET PC, end_inst_output
    JSR emu_handle_inst_output
    SET PC, emu_step_exit
    :end_inst_output

  IFN [A], [inst_input]
    SET PC, end_inst_input
    JSR emu_handle_inst_input
    SET PC, emu_step_exit
    :end_inst_input

  IFN [A], [inst_jump_forward]
    SET PC, end_inst_jump_forward
    JSR emu_handle_inst_jump_forward
    SET PC, emu_step_exit
  :end_inst_jump_forward

  IFN [A], [inst_jump_backward]
    SET PC, end_inst_jump_backward
    JSR emu_handle_inst_jump_backward
    SET PC, emu_step_exit
  :end_inst_jump_backward

  :emu_step_exit
  SET PC, POP

:emu_handle_inst_dec_pointer
  SUB C, 1
  IFL C, mem_start
    SET C, mem_end
  SET PC, POP

:emu_handle_inst_dec_value
  SET X, [C]
  SUB X, 1
  SET [C], x 
  SET PC, POP  

:emu_handle_inst_inc_pointer
  ADD C, 1
  IFG C, mem_end
    SET C, mem_start
  SET PC, POP

:emu_handle_inst_inc_value
  SET X, [C]
  ADD X, 1
  SET [C], x 
  SET PC, POP

:emu_handle_inst_output
  SET PUSH, A
  SET A, [C]
  SET B, [screen_cursor]

  IFL B, 384
    SET PC, inst_output_func_start
    ;;scroll screen
  JSR scroll
  SUB B, 0x20

  :inst_output_func_start
    
  IFE A, 10 ;;new line
    SET PC, inst_output_newline    

  SET PC, inst_output_draw
    
  :inst_output_newline
   ;; is a new line
   SET PUSH, X
   SET PUSH, Y
   SET X, B
   SET Y, 32
   MOD X, Y
   SET Y, 31
   SUB Y, X
   ADD B, Y
   SET Y, POP
   SET X, POP
   SET PC, inst_output_func_end

  :inst_output_draw
  JSR print_char

  :inst_output_func_end
  SET A, POP
  ADD B, 1
  SET [screen_cursor], B
  SET PC, POP

:emu_handle_inst_input
  JSR getc
  SET [C], X
  SET PC, POP

:emu_handle_inst_jump_forward
  IFN [C], 0
    SET PC, POP    

  SUB A, code_start
  JSR get_forward_jump
  ADD A, code_start
  SET PC, POP

:emu_handle_inst_jump_backward
  IFE [C], 0
    SET PC, POP

  SUB A, code_start
  JSR get_backwards_jump
  ADD A, code_start
  SET PC, POP

;A - jump bracket relative location
:get_forward_jump
  SET PUSH, B
  SET B, A
  SET A, rel_map_start
  :get_forward_jump_loop
    IFE A, rel_map_end
      SET PC, get_forward_jump_end
    IFE [A], B 
      SET PC, get_forward_jump_found

    ADD A, 1
    SET PC, get_forward_jump_loop

  :get_forward_jump_found
    SET A, [A + 1]  
    
  :get_forward_jump_end
  SET B, POP
  SET PC, POP

;A - jump bracket relative location
:get_backwards_jump
  SET PUSH, B
  SET B, A
  SET A, rel_map_start
  :get_backwards_jump_loop
    IFE A, rel_map_end
      SET PC, get_backwards_jump_end
    IFE [A], B 
      SET PC, get_backwards_jump_found

    ADD A, 1
    SET PC, get_backwards_jump_loop

  :get_backwards_jump_found
    SET B, A
    SUB B, 1
    SET A, [B]  
    
  :get_backwards_jump_end
  SET B, POP
  SET PC, POP

:build_jump_map
  SET PUSH, A
  SET PUSH, B
  SET A, code_start
  SET B, rel_map_start 
  :build_jump_map_loop
  IFE A, code_end
    SET PC, end_build_jump_map_loop
  IFE [A], [inst_jump_forward]
    SET PUSH, A  
  IFN [A], [inst_jump_backward]
    SET PC, end_build_jump_map_inst_jump_backward ;flipped  
    ; A - end    c - start
    SET C, POP

    SUB C, code_start
    ;got relative start
    SET X, C

    SET C, A
    SUB C, code_start
    ;got relative end
    SET Y, C

    SET [B], X
    SET [B + 1], Y

    ADD B, 2
    :end_build_jump_map_inst_jump_backward

  ADD A, 1
  SET PC, build_jump_map_loop
  :end_build_jump_map_loop
  SET B, POP
  SET A, POP
  SET PC, POP

:getc
    ;Parameters
    ;None.
    ;Returns
    ;X - Char value
        
    ;Don't clobber our environment...
    SET PUSH, A
    SET PUSH, C
    
    :getc_loop
    SET A, 1
    HWI [kb_hwi]

    IFE C, 0x0000
        SET PC, getc_loop
    
    SET X, C
    SET C, POP
    SET A, POP
    SET PC, POP

;A - char
;B - location
:print_char
  SET PUSH, B
  SET PUSH, C
  ADD B, [screen_start]
  SET C, 0xf000
  ADD C, A
  SET [B], C
  SET C, POP
  SET B, POP
  SET PC, POP

:scroll
  SET PUSH, A
  SET PUSH, B
  SET A, [screen_start]
  SET B, A
  ADD B, 384
  
  :scroll_loop
    IFE A, B
      SET PC, scroll_end
    SET [A], [A + 32]
    ADD A, 1
    SET PC, scroll_loop
  :scroll_end
  ;blank last line
  SET A, 11
  MUL A, 32
  ADD A, [screen_start]
  :scroll_end_loop
    IFE A, B  
      SET PC, scroll_end_loop_end
    SET [A], 0      
    ADD A, 1      
    SET PC, scroll_end_loop
  :scroll_end_loop_end
  SET B, POP
  SET A, POP   
  SET PC, POP

:mem_start
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dat 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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