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 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