diff --git a/2019/05.rkt b/2019/05.rkt
new file mode 100644
index 0000000..80828dc
--- /dev/null
+++ b/2019/05.rkt
@@ -0,0 +1,87 @@
+#lang br
+(require racket/file rackunit)
+
+(define (parse-ptr ptr proc)
+  (match (for/list ([c (in-string (~r ptr #:min-width 5 #:pad-string "0"))])
+           (string->number (string c)))
+    [(list d4 d3 d2 d1 d0) (cons (+ (* 10 d1) d0)
+                                 (for/list ([val (list d2 d3 d4)])
+                                   (if (zero? val) proc values)))]))
+
+(define (string->regs str)
+  (list->vector (map string->number (string-split (string-replace str "," " ")))))
+
+(define (run str starting-input)
+  (define regs (string->regs str))
+  (define (deref ptr) (vector-ref regs ptr))
+  (let loop ([ptr 0])
+    (match-define (list opcode mode1 mode2 mode3) (parse-ptr (vector-ref regs ptr) deref))
+    (match opcode
+      ;; add & multiply
+      [(or 1 2) 
+       (vector-set! regs (deref (+ ptr 3))
+                    ((match opcode [1 +][_ *])
+                     (mode1 (deref (+ ptr 1)))
+                     (mode2 (deref (+ ptr 2)))))
+       (loop (+ ptr 4))]
+      ;; input
+      [3 (vector-set! regs (mode1 (+ ptr 1)) starting-input)
+       (loop (+ ptr 2))]
+      ;; output
+      [4 (println (vector-ref regs (mode1 (+ ptr 1))))
+       (loop (+ ptr 2))]
+      ;; jump
+      [(or 5 6) 
+       (if ((match opcode [5 not][_ values]) (zero? (mode1 (deref (+ ptr 1)))))
+           (loop (mode2 (deref (+ ptr 2))))
+           (loop (+ ptr 3)))]
+      ;; compare
+      [(or 7 8)
+       (vector-set! regs (deref (+ ptr 3))
+                    (if ((match opcode [7 <][_ =]) (mode1 (deref (+ ptr 1))) (mode2 (deref (+ ptr 2))))
+                        1
+                        0))
+       (loop (+ ptr 4))]
+      ;; terminate
+      [99 (void)]
+      [_ (error 'unknown-opcode)])))
+
+(define-syntax-rule (last-output-line func)
+  (last (map string->number (string-split (with-output-to-string (λ () func))))))
+
+(check-eq? (last-output-line (run "3,0,4,0,99" 42)) 42)
+;; 1
+(check-eq?
+ (last-output-line (run  (file->string "05.rktd") 1))
+ 15386262)
+
+(check-eq? (last-output-line (run "3,9,8,9,10,9,4,9,99,-1,8" 8)) 1)
+(check-eq? (last-output-line (run "3,9,7,9,10,9,4,9,99,-1,8" 8)) 0)
+(check-eq? (last-output-line (run "3,3,1108,-1,8,3,4,3,99" 8)) 1)
+(check-eq? (last-output-line (run "3,3,1107,-1,8,3,4,3,99" 8)) 0)
+(check-eq? (last-output-line (run "3,12,6,12,15,1,13,14,13,4,13,99,-1,0,1,9" 0)) 0)
+(check-eq? (last-output-line (run "3,3,1105,-1,9,1101,0,0,12,4,12,99,1" 0)) 0)
+
+(check-eq?
+ (last-output-line
+  (run "3,21,1008,21,8,20,1005,20,22,107,8,21,20,1006,20,31,
+1106,0,36,98,0,0,1002,21,125,20,4,20,1105,1,46,104,
+999,1105,1,46,1101,1000,1,20,4,20,1105,1,46,98,99" 0))
+ 999)
+(check-eq?
+ (last-output-line
+  (run "3,21,1008,21,8,20,1005,20,22,107,8,21,20,1006,20,31,
+1106,0,36,98,0,0,1002,21,125,20,4,20,1105,1,46,104,
+999,1105,1,46,1101,1000,1,20,4,20,1105,1,46,98,99" 8))
+ 1000)
+(check-eq?
+ (last-output-line
+  (run "3,21,1008,21,8,20,1005,20,22,107,8,21,20,1006,20,31,
+1106,0,36,98,0,0,1002,21,125,20,4,20,1105,1,46,104,
+999,1105,1,46,1101,1000,1,20,4,20,1105,1,46,98,99" 10))
+ 1001)
+
+;; 2
+(check-eq?
+ (last-output-line (run  (file->string "05.rktd") 5))
+ 10376124)
\ No newline at end of file
diff --git a/2019/05.rktd b/2019/05.rktd
new file mode 100644
index 0000000..28abfc0
--- /dev/null
+++ b/2019/05.rktd
@@ -0,0 +1 @@
+3,225,1,225,6,6,1100,1,238,225,104,0,1101,65,39,225,2,14,169,224,101,-2340,224,224,4,224,1002,223,8,223,101,7,224,224,1,224,223,223,1001,144,70,224,101,-96,224,224,4,224,1002,223,8,223,1001,224,2,224,1,223,224,223,1101,92,65,225,1102,42,8,225,1002,61,84,224,101,-7728,224,224,4,224,102,8,223,223,1001,224,5,224,1,223,224,223,1102,67,73,224,1001,224,-4891,224,4,224,102,8,223,223,101,4,224,224,1,224,223,223,1102,54,12,225,102,67,114,224,101,-804,224,224,4,224,102,8,223,223,1001,224,3,224,1,224,223,223,1101,19,79,225,1101,62,26,225,101,57,139,224,1001,224,-76,224,4,224,1002,223,8,223,1001,224,2,224,1,224,223,223,1102,60,47,225,1101,20,62,225,1101,47,44,224,1001,224,-91,224,4,224,1002,223,8,223,101,2,224,224,1,224,223,223,1,66,174,224,101,-70,224,224,4,224,102,8,223,223,1001,224,6,224,1,223,224,223,4,223,99,0,0,0,677,0,0,0,0,0,0,0,0,0,0,0,1105,0,99999,1105,227,247,1105,1,99999,1005,227,99999,1005,0,256,1105,1,99999,1106,227,99999,1106,0,265,1105,1,99999,1006,0,99999,1006,227,274,1105,1,99999,1105,1,280,1105,1,99999,1,225,225,225,1101,294,0,0,105,1,0,1105,1,99999,1106,0,300,1105,1,99999,1,225,225,225,1101,314,0,0,106,0,0,1105,1,99999,108,226,226,224,102,2,223,223,1005,224,329,101,1,223,223,1107,226,677,224,1002,223,2,223,1005,224,344,101,1,223,223,8,226,677,224,102,2,223,223,1006,224,359,101,1,223,223,108,677,677,224,1002,223,2,223,1005,224,374,1001,223,1,223,1108,226,677,224,1002,223,2,223,1005,224,389,101,1,223,223,1007,677,677,224,1002,223,2,223,1006,224,404,1001,223,1,223,1108,677,677,224,102,2,223,223,1006,224,419,1001,223,1,223,1008,226,677,224,102,2,223,223,1005,224,434,101,1,223,223,107,677,677,224,102,2,223,223,1006,224,449,1001,223,1,223,1007,226,677,224,102,2,223,223,1005,224,464,101,1,223,223,7,677,226,224,102,2,223,223,1005,224,479,101,1,223,223,1007,226,226,224,102,2,223,223,1005,224,494,101,1,223,223,7,677,677,224,102,2,223,223,1006,224,509,101,1,223,223,1008,677,677,224,1002,223,2,223,1006,224,524,1001,223,1,223,108,226,677,224,1002,223,2,223,1006,224,539,101,1,223,223,8,226,226,224,102,2,223,223,1006,224,554,101,1,223,223,8,677,226,224,102,2,223,223,1005,224,569,1001,223,1,223,1108,677,226,224,1002,223,2,223,1006,224,584,101,1,223,223,1107,677,226,224,1002,223,2,223,1005,224,599,101,1,223,223,107,226,226,224,102,2,223,223,1006,224,614,1001,223,1,223,7,226,677,224,102,2,223,223,1005,224,629,1001,223,1,223,107,677,226,224,1002,223,2,223,1005,224,644,1001,223,1,223,1107,677,677,224,102,2,223,223,1006,224,659,101,1,223,223,1008,226,226,224,1002,223,2,223,1006,224,674,1001,223,1,223,4,223,99,226
\ No newline at end of file