diff --git a/README.md b/README.md
index b31a626..af1bd4a 100644
--- a/README.md
+++ b/README.md
@@ -6,44 +6,47 @@ Compiles C code to Mindustry logic. Still in beta, so compiled output may not be
 
 `pip install git+https://github.com/SuperStormer/c2logic`
 
-# Usage
+# Documentation
 
 Run the command line tool using:
 
 `c2logic filename -O optimization_level`
 
-where `filename` is a string and `optimization_level` is an optional integer
+where `filename` is a string and `optimization_level` is an optional integer.
+
 Optimization Level:
 
 0. completely unoptimized.
 1. the default
     - modify variables without using a temporary
 2. turns on some potentially unsafe optimizations
-    - augmented assignment and pre/postincrement/decrement don't modify \_\_rax
+    - augmented assignment and pre/postincrement/decrement don't modify `__rax`
     - returning from main becomes equivalent to `end`
 
-Locals are rewritten as _<varname>_<func_name>. Globals are unchanged.
+Locals are rewritten as `_<varname>_<func_name>`. Globals are unchanged.
 
 Special Variables:
 
--   \_\_rax: similar to x86 rax
--   \_\_rbx: stores left hand side of binary ops to avoid clobbering by the right side
--   \_\_retaddr\_\*: stores return address of func call
+-   `__rax`: similar to x86 rax
+-   `__rbx`: stores left hand side of binary ops to avoid clobbering by the right side
+-   `__retaddr__<func_name>`: stores return address of func call
 
-When developing your script, you can include `c2logic/builtins.h` located in the python include directory(location depends on system, mine is at `~/.local/include/python3.8/`)
+When writing your code, you must include `c2logic/builtins.h`, which is located in the python include directory (location depends on system, mine is at `~/.local/include/python3.8/`).
 
-See [examples](./examples) for API sample usage.
+See [include/builtins.h](./include/builtins.h) for API definitions and [examples](./examples) for API sample usage.
 
-# Documentation
+# Supported Features
 
-See `include/builtins.h` for API definitions.
+-   all Mindustry instructions as of BE
+-   all control flow structures except goto
+-   functions
+-   local/global variables
 
 # Unsupported Features
 
--   drawing
--   getlink
--   memory cell read/write
--   structs
--   enums
-
-Some of these features may be worked around using `asm()`.
+-   structs - split it into multiple variables
+-   enums - use an int plus macros
+-   block scoped variables - just use locals
+-   typedefs - use macros
+-   pointers - don't use them
+-   goto - don't use it
diff --git a/c2logic/compiler.py b/c2logic/compiler.py
index 538b3eb..401beeb 100644
--- a/c2logic/compiler.py
+++ b/c2logic/compiler.py
@@ -7,10 +7,10 @@ from pycparser.c_ast import (
 	Compound, Constant, DeclList, Enum, FileAST, FuncDecl, Struct, TypeDecl
 )
 
-from .consts import builtins, func_binary_ops, func_unary_ops
+from .consts import builtins, draw_funcs, func_binary_ops, func_unary_ops
 from .instructions import (
-	BinaryOp, Enable, End, FunctionCall, Instruction, JumpCondition, Print, PrintFlush, Radar,
-	RawAsm, RelativeJump, Return, Sensor, Set, Shoot, UnaryOp
+	BinaryOp, Draw, DrawFlush, Enable, End, FunctionCall, GetLink, Instruction, JumpCondition,
+	Print, PrintFlush, Radar, RawAsm, Read, RelativeJump, Return, Sensor, Set, Shoot, UnaryOp, Write
 )
 
 @dataclass
@@ -46,8 +46,6 @@ class Compiler(c_ast.NodeVisitor):
 		self.curr_function: Function = None
 		self.globals: list = None
 		self.loops: list = None
-		#self.loop_start: int = None
-		#self.loop_end_jumps: list = None
 		self.loop_end: int = None
 	
 	def compile(self, filename: str):
@@ -55,8 +53,6 @@ class Compiler(c_ast.NodeVisitor):
 		self.curr_function = None
 		self.globals = []
 		self.loops = []
-		#self.loop_start = None
-		#self.loop_end_jumps = None
 		self.loop_end = None
 		ast = parse_file(
 			filename, use_cpp=True, cpp_args=["-I", site.getuserbase() + "/include/python3.8"]
@@ -122,8 +118,6 @@ class Compiler(c_ast.NodeVisitor):
 		if self.opt_level >= 1 and hasattr(top, "dest") and top.dest == "__rax":
 			#avoid indirection through __rax
 			self.curr_function.instructions[-1].dest = varname
-			
-			#self.push(Set(varname, self.pop().src))
 		else:
 			self.push(Set(varname, "__rax"))
 	
@@ -168,6 +162,34 @@ class Compiler(c_ast.NodeVisitor):
 					break
 		return args
 	
+	def get_unary_builtin_arg(self, args):
+		self.visit(args[0])
+		if self.can_avoid_indirection():
+			return self.pop().src
+		else:
+			return "__rax"
+	
+	def get_binary_builtin_args(self, args, name):
+		left_name = f"__{name}_arg0"
+		self.visit(args[0])
+		self.set_to_rax(left_name)
+		self.visit(args[1])
+		left = left_name
+		right = "__rax"
+		if self.can_avoid_indirection():
+			right = self.pop().src
+		if self.can_avoid_indirection(left_name):
+			left = self.pop().src
+		return left, right
+	
+	def get_multiple_psuedofunc_args(self, args):
+		argnames = []
+		for i, arg in enumerate(args):
+			self.visit(arg)
+			self.set_to_rax(f"__write_arg{i}")
+			argnames.append(f"__write_arg{i}")
+		return self.optimize_psuedofunc_args(argnames)
+	
 	#visitors
 	def visit_FuncDef(self, node):  # function definitions
 		func_name = node.decl.name
@@ -311,11 +333,11 @@ class Compiler(c_ast.NodeVisitor):
 				self.curr_function.instructions
 			)
 	
-	def visit_Break(self, node):
+	def visit_Break(self, node):  #pylint: disable=unused-argument
 		self.push(RelativeJump(None, JumpCondition.always))
 		self.loops[-1].end_jumps.append(self.curr_offset())
 	
-	def visit_Continue(self, node):
+	def visit_Continue(self, node):  #pylint: disable=unused-argument
 		self.push(RelativeJump(self.loops[-1].start, JumpCondition.always))
 	
 	def visit_Return(self, node):
@@ -328,26 +350,18 @@ class Compiler(c_ast.NodeVisitor):
 			args = node.args.exprs
 		else:
 			args = []
-		#TODO avoid duplication in psuedo-function calls
+		#TODO avoid duplication in builtin calls
 		if name == "asm":
 			arg = args[0]
 			if not isinstance(arg, Constant) or arg.type != "string":
 				raise TypeError("Non-string argument to asm", node)
 			self.push(RawAsm(arg.value[1:-1]))
 		elif name in ("print", "printd"):
-			self.visit(args[0])
-			if self.can_avoid_indirection():
-				self.push(Print(self.pop().src))
-			else:
-				self.push(Print("__rax"))
+			self.push(Print(self.get_unary_builtin_arg(args)))
 		elif name == "printflush":
-			self.visit(args[0])
-			if self.can_avoid_indirection():
-				self.push(PrintFlush(self.pop().src))
-			else:
-				self.push(PrintFlush("__rax"))
+			self.push(PrintFlush(self.get_unary_builtin_arg(args)))
 		elif name == "radar":
-			args = []
+			argnames = []
 			for i, arg in enumerate(args):
 				if 1 <= i <= 4:
 					if not isinstance(arg, Constant) or arg.type != "string":
@@ -356,9 +370,9 @@ class Compiler(c_ast.NodeVisitor):
 				else:
 					self.visit(arg)
 				self.set_to_rax(f"__radar_arg{i}")
-				args.append(f"__radar_arg{i}")
-			args = self.optimize_psuedofunc_args(args)
-			self.push(Radar("__rax", *args))  #pylint: disable=no-value-for-parameter
+				argnames.append(f"__radar_arg{i}")
+			argnames = self.optimize_psuedofunc_args(argnames)
+			self.push(Radar("__rax", *argnames))  #pylint: disable=no-value-for-parameter
 		elif name == "sensor":
 			self.visit(args[0])
 			self.set_to_rax("__sensor_arg0")
@@ -374,36 +388,31 @@ class Compiler(c_ast.NodeVisitor):
 				left = self.pop().src
 			self.push(Sensor("__rax", left, right))
 		elif name == "enable":
-			self.visit(args[0])
-			self.set_to_rax("__enable_arg0")
-			self.visit(args[1])
-			left = "__enable_arg0"
-			right = "__rax"
-			if self.can_avoid_indirection():
-				right = self.pop().src
-			if self.can_avoid_indirection("__enable_arg0"):
-				left = self.pop().src
+			left, right = self.get_binary_builtin_args(args, "enable")
 			self.push(Enable(left, right))
 		elif name == "shoot":
-			args = []
-			for i, arg in enumerate(args):
-				self.visit(arg)
-				self.set_to_rax(f"__shoot_arg{i}")
-				args.append(f"__shoot_arg{i}")
-			args = self.optimize_psuedofunc_args(args)
-			self.push(Shoot(*args))  #pylint: disable=no-value-for-parameter
+			self.push(Shoot(*self.get_multiple_psuedofunc_args(args)))  #pylint: disable=no-value-for-parameter
+		elif name == "get_link":
+			self.visit(args[0])
+			if self.can_avoid_indirection():
+				self.push(GetLink("__rax", self.pop().src))
+			else:
+				self.push(GetLink("__rax", "__rax"))
+		elif name == "read":
+			cell, index = self.get_binary_builtin_args(args, "read")
+			self.push(Read("__rax", cell, index))
+		elif name == "write":
+			self.push(Write(*self.get_multiple_psuedofunc_args(args)))  #pylint: disable=no-value-for-parameter
 		elif name == "end":
 			self.push(End())
+		elif name in draw_funcs:
+			argnames = self.get_multiple_psuedofunc_args(args)
+			cmd = draw_funcs[name]
+			self.push(Draw(cmd, *argnames))
+		elif name == "drawflush":
+			self.push(DrawFlush(self.get_unary_builtin_arg(args)))
 		elif name in func_binary_ops:
-			self.visit(args[0])
-			self.set_to_rax("__binary_arg0")
-			self.visit(args[1])
-			left = "__binary_arg0"
-			right = "__rax"
-			if self.can_avoid_indirection():
-				right = self.pop().src
-			if self.can_avoid_indirection("__binary_arg0"):
-				left = self.pop().src
+			left, right = self.get_binary_builtin_args(args, "binary")
 			self.push(BinaryOp("__rax", left, right, name))
 		elif name in func_unary_ops:
 			self.visit(args[0])
diff --git a/c2logic/consts.py b/c2logic/consts.py
index 6b962f1..bb09834 100644
--- a/c2logic/consts.py
+++ b/c2logic/consts.py
@@ -36,4 +36,13 @@ func_unary_ops = ["abs", "log", "log10", "sin", "cos", "tan", "floor", "ceil", "
 binary_ops.update(dict(zip(func_binary_ops, func_binary_ops)))
 unary_ops.update(dict(zip(func_unary_ops, func_unary_ops)))
 
-builtins = ["print", "printd", "printflush", "radar", "sensor", "enable", "shoot", "end"]
+draw_funcs = {
+	"draw" + func.lower(): func
+	for func in
+	["clear", "color", "stroke", "line", "rect", "lineRect", "poly", "linePoly", "triangle"]
+}
+
+builtins = [
+	"print", "printd", "printflush", "radar", "sensor", "enable", "shoot", "get_link", "read",
+	"write", "drawflush", "end"
+] + list(draw_funcs.keys())
diff --git a/c2logic/instructions.py b/c2logic/instructions.py
index 2cc05c9..d08f601 100644
--- a/c2logic/instructions.py
+++ b/c2logic/instructions.py
@@ -87,11 +87,11 @@ class Print(Instruction):
 		return f"print {self.val}"
 
 class PrintFlush(Instruction):
-	def __init__(self, val: str):
-		self.val = val
+	def __init__(self, message: str):
+		self.message = message
 	
 	def __str__(self):
-		return f"printflush {self.val}"
+		return f"printflush {self.message}"
 
 class Radar(Instruction):
 	def __init__(
@@ -135,6 +135,48 @@ class Shoot(Instruction):
 	def __str__(self):
 		return f"control shoot {self.obj} {self.x} {self.y} {self.shoot} 0"
 
+class GetLink(Instruction):
+	def __init__(self, dest: str, index: str):
+		self.dest = dest
+		self.index = index
+	
+	def __str__(self):
+		return f"getlink {self.dest} {self.index}"
+
+class Read(Instruction):
+	def __init__(self, dest: str, src: str, index: str):
+		self.dest = dest
+		self.src = src
+		self.index = index
+	
+	def __str__(self):
+		return f"read {self.dest} {self.src} {self.index}"
+
+class Write(Instruction):
+	def __init__(self, dest: str, src: str, index: str):
+		self.dest = dest
+		self.src = src
+		self.index = index
+	
+	def __str__(self):
+		return f"write {self.dest} {self.src} {self.index}"
+
+class Draw(Instruction):
+	def __init__(self, cmd: str, *args):
+		self.cmd = cmd
+		self.args = args
+	
+	def __str__(self):
+		args = list(self.args) + ['0'] * (6 - len(self.args))
+		return f"draw {self.cmd} {' '.join(args)}"
+
+class DrawFlush(Instruction):
+	def __init__(self, display: str):
+		self.display = display
+	
+	def __str__(self):
+		return f"drawflush {self.display}"
+
 class End(Instruction):
 	def __str__(self):
 		return "end"
diff --git a/examples/drawing.c b/examples/drawing.c
new file mode 100644
index 0000000..0a1c59e
--- /dev/null
+++ b/examples/drawing.c
@@ -0,0 +1,9 @@
+#include "c2logic/builtins.h"
+extern struct MindustryObject display1;
+void main(void) {
+	drawcolor(128, 128, 0);
+	drawpoly(40, 40, 6, 10, 0);
+	drawcolor(0, 128, 128);
+	drawpoly(40, 40, 3, 10, 180);
+	drawflush(display1);
+}
\ No newline at end of file
diff --git a/include/builtins.h b/include/builtins.h
index 1076f6f..04ad9bb 100644
--- a/include/builtins.h
+++ b/include/builtins.h
@@ -1,18 +1,34 @@
 #ifndef MINDUSTRY_H
 #define MINDUSTRY_H
 struct MindustryObject {};
-// void _asm(char* code);
 // builtin instructions
 void print(char* s);
 void printd(double s);
-void printflush(struct MindustryObject msg_block);
+void printflush(struct MindustryObject message);
 
 struct MindustryObject radar(struct MindustryObject obj, char* target1, char* target2,
 							 char* target3, char* sort, double index);
 double sensor(struct MindustryObject obj, char* prop);
 void enable(struct MindustryObject obj, double enabled);
 void shoot(struct MindustryObject obj, double x, double y, double shoot);
+
+struct MindustryObject get_link(double index);
+double read(struct MindustryObject cell, double index);
+void write(struct MindustryObject cell, double index, double val);
+
+void drawclear(double r, double g, double b);
+void drawcolor(double r, double g, double b);
+void drawstroke(double width);
+void drawline(double x1, double y1, double x2, double y2);
+void drawrect(double x, double y, double w, double h);
+void drawlinerect(double x, double y, double w, double h);
+void drawpoly(double x, double y, double sides, double radius, double rotation);
+void drawlinepoly(double x, double y, double sides, double radius, double rotation);
+void drawtriangle(double x1, double y1, double x2, double y2, double x3, double y3);
+void drawflush(struct MindustryObject display);
+
 void end();
+
 // builtin binary operators
 double pow(double x, double y);
 double max(double x, double y);