diff --git a/nock-j-registerize.rkt b/nock-j-registerize.rkt
new file mode 100644
index 0000000..e77b9f1
--- /dev/null
+++ b/nock-j-registerize.rkt
@@ -0,0 +1,571 @@
+#lang racket
+
+(require rackunit)
+
+;; This pass builds on the mutable state (the continuation stack) introduced in (i)
+;; and adds mutable registers, which are updated by the `set-register` function.
+;;
+;; Procedures no longer take language-native arguments, but have an explicit convention
+;; for the globally-defined registers in which they expect their arguments.
+
+(define stack '())
+(define (push-k k)
+ (set! stack (cons k stack))) 
+
+(define ra 0)
+(define rb 0)
+(define rc 0)
+(define rd 0)
+(define re 0)
+
+(define (set-register register x)
+ (match register
+  ('ra (set! ra x))
+  ('rb (set! rb x))
+  ('rc (set! rc x))
+  ('rd (set! rd x))
+  ('re (set! re x))))
+
+; interface with non-CPS, non-registerized calling convention
+(define (nock-noun subject formula gates err-k trace)
+ (begin
+  (push-k empty-k)
+  (set-register 'ra subject)
+  (set-register 'rb formula)
+  (set-register 'rc gates)
+  (set-register 'rd err-k)
+  (set-register 're trace)
+  (nock-noun-cps)))
+
+; ra - subject
+; rb - formula
+; rc - gate stack
+; rd - err continuation
+; re - err trace
+(define (nock-noun-cps)
+ (match rb
+  ([cons (cons (var b) (var c)) (var d)]
+   (begin
+    (push-k (nock-cons-k-1 ra d rc rd re))
+    ; ra already set
+    (set-register 'rb (cons b c))
+    ; rc already set
+    ; rd already set
+    ; re already set
+    (nock-noun-cps)))
+  ([cons 0 (var b)]
+   (begin
+    ; ra already set
+    (set-register 'rb b)
+    (set-register 'rc rd)
+    (set-register 'rd re)
+    (nock-tree-find)))
+  ([cons 1 (var b)]
+   (begin
+    (set-register 'ra b)
+    (apply-k)))
+  ([cons 2 (cons (var b) (var c))]
+   (begin
+    (push-k (nock-2-k-1 ra c rc rd re))
+    ; ra already set
+    (set-register 'rb b)
+    ; rc already set
+    ; rd already set
+    ; re already set
+    (nock-noun-cps)))
+  ([cons 3 (var b)]
+   (begin
+    (push-k nock-3-k)
+    ; ra already set
+    (set-register 'rb b)
+    ; rc already set
+    ; rd already set
+    ; re already set
+    (nock-noun-cps)))
+  ([cons 4 (var b)]
+   (begin
+    (push-k nock-4-k)
+    ; ra already set
+    (set-register 'rb b)
+    ; rc already set
+    ; rd already set
+    ; re already set
+    (nock-noun-cps)))
+  ([cons 5 (cons (var b) (var c))]
+   (begin
+    (push-k (nock-5-k-1 ra c rc rd re))
+    ; ra already set
+    (set-register 'rb b)
+    ; rc already set
+    ; rd already set
+    ; re already set
+    (nock-noun-cps)))
+  ([cons 6 (cons (var b) (cons (var c) (var d)))]
+   (begin
+    (push-k (nock-6-k ra c d rc rd re))
+    ; ra already set
+    (set-register 'rb b)
+    ; rc already set
+    ; rd already set
+    ; re already set
+    (nock-noun-cps)))
+  ([cons 7 (cons (var b) (var c))]
+   (begin
+    (push-k (nock-7-k c rc rd re))
+    ; ra already set
+    (set-register 'rb b)
+    ; rc already set
+    ; rd already set
+    ; re already set
+    (nock-noun-cps)))
+  ([cons 8 (cons (var b) (var c))]
+   (begin
+    (push-k (nock-8-k ra c rc rd re))
+    ; ra already set
+    (set-register 'rb b)
+    ; rc already set
+    ; rd already set
+    ; re already set
+    (nock-noun-cps)))
+  ([cons 9 (cons (var b) (var c))]
+   (begin
+    (push-k (nock-9-k-1 b rc rd re))
+    ; ra already set
+    (set-register 'rb c)
+    ; rc already set
+    ; rd already set
+    ; re already set
+    (nock-noun-cps)))
+  ([cons 10 (cons (cons (var b) (var c)) (var d))]
+   (begin
+    (push-k (nock-10-k-1 ra d b rc rd re))
+    ; ra already set
+    (set-register 'rb c)
+    ; rc already set
+    ; rd already set
+    ; re already set
+    (nock-noun-cps)))
+  ([cons 11 (cons (cons (var b) (var c)) (var d))]
+   (begin
+    (push-k (nock-11-k ra b d rc rd re))
+    ; ra already set
+    (set-register 'rb c)
+    ; rc already set
+    ; rd already set
+    ; re already set
+    (nock-noun-cps)))
+  ([cons 11 (cons (var b) (var c))]
+   (begin
+    ; ra already set
+    (set-register 'rb c)
+    ; rc already set
+    ; rd already set
+    ; re already set
+    (nock-noun-cps)))
+  ([cons 12 (cons (var ref) (var path))]
+   (begin
+    (push-k (nock-12-k-1 ra path rc rd re))
+    ; ra already set
+    (set-register 'rb ref)
+    ; rc already set
+    ; rd already set
+    ; re already set
+    (nock-noun-cps)))))
+
+; ra - address to reverse
+(define (reverse-address)
+ (begin
+  ; ra already set
+  (set-register 'rb 1)
+  (reverse-address-acc)))
+
+; ra - address to reverse
+; rb - accumulator for reversed address
+(define (reverse-address-acc)
+ (if (= ra 1)
+  (begin
+   (set-register 'ra rb)
+   (apply-k))
+  (begin
+   (set-register 'rb (bitwise-ior (arithmetic-shift rb 1) (bitwise-and ra 1)))
+   (set-register 'ra (arithmetic-shift ra -1))
+   (reverse-address-acc))))
+
+; ra - tree to find subtree of
+; rb - reversed address to find
+(define (nock-tree-find-reversed)
+ (if (= rb 1)
+  ; ra already set
+  (apply-k)
+  (if (even? rb)
+   (begin
+    (set-register 'ra (car ra))
+    (set-register 'rb (arithmetic-shift rb -1))
+    (nock-tree-find-reversed))
+   (begin
+    (set-register 'ra (cdr ra))
+    (set-register 'rb (arithmetic-shift rb -1))
+    (nock-tree-find-reversed)))))
+
+; ra - tree to find subtree of
+; rb - address of subtree
+; rc - err continuation
+; rd - err trace
+(define (nock-tree-find)
+ (if (= rb 0)
+  (begin
+   (set-register 'ra rc)
+   (set-register 'rb (cons 2 rd))
+   (apply-err-k))
+  (begin
+   (push-k (nock-tree-find-k ra))
+   (set-register 'ra rb)
+   (reverse-address))))
+
+; ra - subtree to place at address
+; rb - reversed address
+; rc - tree to edit
+(define (nock-tree-edit-reversed)
+ (if (= rb 1)
+  ; ra already set
+  (apply-k)
+  (if (even? rb)
+   (begin
+    (push-k (nock-tree-edit-car-k rc))
+    ; ra already set
+    (set-register 'rb (arithmetic-shift rb -1))
+    (set-register 'rc (car rc))
+    (nock-tree-edit-reversed))
+   (begin
+    (push-k (nock-tree-edit-cdr-k rc))
+    ; ra already set
+    (set-register 'rb (arithmetic-shift rb -1))
+    (set-register 'rc (cdr rc))
+    (nock-tree-edit-reversed)))))
+
+; # operator in nock spec: tree editing
+; ra - subtree to place at address
+; rb - address
+; rc - tree to edit
+; rd - err continuation
+; re - err trace
+(define (nock-tree-edit)
+ (if (= rb 0)
+  (begin
+   (set-register 'ra rd)
+   (set-register 'rb (cons 2 re))
+   (apply-err-k))
+  (begin
+   (push-k (nock-tree-edit-k ra rc))
+   (set-register 'ra rb)
+   (reverse-address))))
+
+(define empty-k (list 'empty-k))
+(define (nock-cons-k-1 subject d gates err-k trace) (list 'nock-cons-k-2 subject d gates err-k trace))
+(define (nock-cons-k-2 u) (list 'nock-cons-k-2 u))
+(define (nock-2-k-1 subject c gates err-k trace) (list 'nock-2-k-1 subject c gates err-k trace)) 
+(define (nock-2-k-2 u gates err-k trace) (list 'nock-2-k-2 u gates err-k trace))
+(define nock-3-k (list 'nock-3-k))
+(define nock-4-k (list 'nock-4-k))
+(define (nock-5-k-1 subject c gates err-k trace) (list 'nock-5-k-1 subject c gates err-k trace))
+(define (nock-5-k-2 u) (list 'nock-5-k-2 u))
+(define (nock-6-k subject c d gates err-k trace) (list 'nock-6-k subject c d gates err-k trace))
+(define (nock-7-k c gates err-k trace) (list 'nock-7-k c gates err-k trace))
+(define (nock-8-k subject c gates err-k trace) (list 'nock-8-k subject c gates err-k trace))
+(define (nock-9-k-1 b gates err-k trace) (list 'nock-9-k-1 b gates err-k trace))
+(define (nock-9-k-2 u gates err-k trace) (list 'nock-9-k-2 u gates err-k trace))
+(define (nock-10-k-1 subject d b gates err-k trace) (list 'nock-10-k-1 subject d b gates err-k trace))
+(define (nock-10-k-2 u b err-k trace) (list 'nock-10-k-2 u b err-k trace))
+(define (nock-11-k subject b d gates err-k trace) (list 'nock-11-k subject b d gates err-k trace))
+(define (nock-12-k-1 subject path gates err-k trace) (list 'nock-12-k-1 subject path gates err-k trace))
+(define (nock-12-k-2 gates err-k trace u) (list 'nock-12-k-2 gates err-k trace u))
+(define (nock-12-k-3 u v outer-err-k outer-trace) (list 'nock-12-k u v outer-err-k outer-trace))
+(define (nock-tree-find-k tree) (list 'nock-tree-find-k tree))
+(define (nock-tree-edit-car-k tree) (list 'nock-tree-edit-car-k tree))
+(define (nock-tree-edit-cdr-k tree) (list 'nock-tree-edit-cdr-k tree))
+(define (nock-tree-edit-k subtree tree) (list 'nock-tree-edit-k subtree tree))
+
+; apply the continuation from the top of the stack
+; ra - result
+(define (apply-k)
+ (let
+  [(k (car stack))]
+  (begin
+   (set! stack (cdr stack))
+   (match k       
+    ([list 'empty-k] ra)
+    ([list 'nock-cons-k-1 (var subject) (var d) (var gates) (var err-k) (var trace)]
+     (begin
+      (push-k (nock-cons-k-2 ra))
+      (set-register 'ra subject)
+      (set-register 'rb d)
+      (set-register 'rc gates)
+      (set-register 'rd err-k)
+      (set-register 're trace)
+      (nock-noun-cps subject d gates err-k trace)))
+    ([list 'nock-cons-k-2 (var u) (var k^)]
+     (begin
+      (set-register 'ra (cons u ra))
+      (apply-k)))
+    ([list 'nock-2-k-1 (var subject) (var c) (var gates) (var err-k) (var trace)]
+     (begin
+      (push-k (nock-2-k-2 ra gates err-k trace))
+      (set-register 'ra subject)
+      (set-register 'rb c)
+      (set-register 'rc gates)
+      (set-register 'rd err-k)
+      (set-register 're trace)
+      (nock-noun-cps)))
+    ([list 'nock-2-k-2 (var u) (var gates) (var err-k) (var trace)]
+     (begin
+      (set-register 'rb ra)
+      (set-register 'ra u)
+      (set-register 'rc gates)
+      (set-register 'rd err-k)
+      (set-register 're trace)
+      (nock-noun-cps)))
+    ([list 'nock-3-k]
+     (if (pair? ra)
+      (begin
+       (set-register 'ra 0)
+       (apply-k))
+      (begin
+       (set-register 'ra 1)
+       (apply-k))))
+    ([list 'nock-4-k]
+     (begin
+      (set-register 'ra (+ 1 ra))
+      (apply-k)))
+    ([list 'nock-5-k-1 (var subject) (var c) (var gates) (var err-k) (var trace)]
+     (begin
+      (push-k (nock-5-k-2 ra))
+      (set-register 'ra subject)
+      (set-register 'rb c)
+      (set-register 'rc gates)
+      (set-register 'rd err-k)
+      (set-register 're trace)
+      (nock-noun-cps)))
+    ([list 'nock-5-k-2 (var u)]
+     (if (eqv? u ra)
+      (begin
+       (set-register 'ra 0)
+       (apply-k))
+      (begin
+       (set-register 'ra 1)
+       (apply-k))))
+    ([list 'nock-6-k (var subject) (var c) (var d) (var gates) (var err-k) (var trace)]
+     (if (= 0 ra)
+      (begin
+       (set-register 'ra subject)
+       (set-register 'rb c)
+       (set-register 'rc gates)
+       (set-register 'rd err-k)
+       (set-register 're trace)
+       (nock-noun-cps))
+       (if (= 1 ra)
+        (begin
+         (set-register 'ra subject)
+         (set-register 'rb d)
+         (set-register 'rc gates)
+         (set-register 'rd err-k)
+         (set-register 're trace)
+         (nock-noun-cps))
+        (begin
+         (set-register 'ra err-k)
+         (set-register 'rb (cons 2 trace))
+         (apply-err-k)))))
+    ([list 'nock-7-k (var c) (var gates) (var err-k) (var trace)]
+     (begin
+      ; ra already set
+      (set-register 'rb c)
+      (set-register 'rc gates)
+      (set-register 'rd err-k)
+      (set-register 're trace)
+      (nock-noun-cps)))
+    ([list 'nock-8-k (var subject) (var c) (var gates) (var err-k) (var trace)]
+     (begin
+      (set-register 'ra (cons ra subject))
+      (set-register 'rb c)
+      (set-register 'rc gates)
+      (set-register 'rd err-k)
+      (set-register 're trace)
+      (nock-noun-cps)))
+    ([list 'nock-9-k-1 (var b) (var gates) (var err-k) (var trace)]
+     (begin
+      (push-k (nock-9-k-2 ra gates err-k trace))
+      ; ra already set
+      (set-register 'rb b)
+      (set-register 'rc err-k)
+      (set-register 'rd trace)
+      (nock-tree-find)))
+    ([list 'nock-9-k-2 (var u) (var gates) (var err-k) (var trace)]
+     (begin
+      (set-register 'rb ra)
+      (set-register 'ra u)
+      (set-register 'rc gates)
+      (set-register 'rd err-k)
+      (set-register 're trace)
+      (nock-noun-cps)))
+    ([list 'nock-10-k-1 (var subject) (var d) (var b) (var gates) (var err-k) (var trace)]
+     (begin
+      (push-k (nock-10-k-2 ra b err-k trace))
+      (set-register 'ra subject)
+      (set-register 'rb d)
+      (set-register 'rc gates)
+      (set-register 'rd err-k)
+      (set-register 're trace)
+      (nock-noun-cps)))
+    ([list 'nock-10-k-2 (var u) (var b) (var err-k) (var trace)]
+     (begin
+      (set-register 'rc ra)
+      (set-register 'ra u)
+      (set-register 'rb b)
+      (set-register 'rd err-k)
+      (set-register 're trace)
+      (nock-tree-edit)))
+    ([list 'nock-11-k (var subject) (var b) (var d) (var gates) (var err-k) (var trace)]
+     (if (member b (list (tas "hunk") (tas "hand") (tas "lose") (tas "mean") (tas "spot")))
+      (begin
+       (set-register 'ra subject)
+       (set-register 'rb d)
+       (set-register 'rc gates)
+       (set-register 'rd err-k)
+       (set-register 're (cons (cons b ra) trace))
+       (nock-noun-cps))
+      (begin
+       (set-register 'ra subject)
+       (set-register 'rb d)
+       (set-register 'rc gates)
+       (set-register 'rd err-k)
+       (set-register 're trace)
+       (nock-noun-cps))))
+    ([list 'nock-12-k-1 (var subject) (var path) (var gates) (var err-k) (var trace)]
+     (begin
+      (push-k (nock-12-k-2 gates err-k trace ra))
+      (set-register 'ra subject)
+      (set-register 'rb path)
+      (set-register 'rc gates)
+      (set-register 'rd err-k)
+      (set-register 're trace)
+      (nock-noun-cps)))
+    ([list 'nock-12-k-2 (var gates) (var err-k) (var trace) (var u)]
+      (let*
+       [(gate (car (car gates)))
+        (outer-err-k err-k)
+        (err-k (car (cdr (car gates))))
+        (outer-trace trace)
+        (trace (cdr (cdr (car gates))))
+        (gates (cdr gates))
+        (core (cons (car gate) (cons (cons u ra) (cdr (cdr gate)))))]
+       (begin
+        (push-k (nock-12-k-3 u ra outer-err-k outer-trace))
+        (set-register 'ra core)
+        (set-register 'rb (car core))
+        (set-register 'rc gates)
+        (set-register 'rd err-k)
+        (set-register 're trace)
+        (nock-noun-cps))))
+    ([list 'nock-12-k-3 (var u) (var v) (var outer-err-k) (var outer-trace)]
+     (if (equal? 0 ra)
+      ; ~
+      (begin
+       (set-register 'ra outer-err-k)
+       (set-register 'rb (cons 1 (cdr v)))
+       (apply-err-k))
+      (if (equal? 0 (car ra))
+       (begin
+        (set-register 'ra outer-err-k)
+        (set-register 'rb (cons 2 (cons (cons (tas "hunk") (cons u v)) outer-trace)))
+        (apply-err-k))
+       (begin
+        (set-register 'ra (cdr (cdr ra)))
+        (apply-k)))))
+    ([list 'nock-tree-edit-car-k (var tree)]
+     (begin
+      (set-register 'ra (cons ra (cdr tree)))
+      (apply-k)))
+    ([list 'nock-tree-edit-cdr-k (var tree)]
+     (begin
+      (set-register 'ra (cons (car tree) ra))
+      (apply-k)))
+    ([list 'nock-tree-edit-k (var subtree) (var tree)]
+     (begin
+      (set-register 'rb ra)
+      (set-register 'ra subtree)
+      (set-register 'rc tree)
+      (nock-tree-edit-reversed)))
+    ([list 'nock-tree-find-k (var tree)]
+     (begin
+      (set-register 'rb ra)
+      (set-register 'ra tree)
+      (nock-tree-find-reversed)))
+    ((var k^) #:when (procedure? k^) (k^ ra))))))
+
+; ra - err continuation
+; rb - err trace
+(define (apply-err-k) (ra))
+
+;; macro for %tas literals:
+;; converts input string into a numeric literal of that string represented as a %tas, i.e. an
+;; atom with the ascii bytes of the string in sequence (first->LSB, last->MSB)
+(define-syntax (tas str)
+ (quasisyntax
+  (unsyntax
+   (foldr
+    (lambda (char atom) (bitwise-ior (bitwise-and #xFF (char->integer char)) (arithmetic-shift atom 8)))
+    0
+    (string->list (car (cdr (syntax->datum str))))))))
+
+(define nock-here 1)
+(define (nock-car address) (* address 2))
+(define (nock-cdr address) (+ 1 (* address 2)))
+(define (get-0 x) (cons 0 x))
+(define (literal-1 x) (cons 1 x))
+(define (eval-2 x y) (cons 2 (cons x y)))
+(define (cell?-3 x) (cons 3 x))
+(define (inc-4 x) (cons 4 x))
+(define (=-5 x y) (cons 5 (cons x y)))
+(define (if-6 x y z) (cons 6 (cons x (cons y z))))
+(define (compose-7 x y) (cons 7 (cons x y)))
+(define (declare-8 x y) (cons 8 (cons x y)))
+(define (call-9 x y) (cons 9 (cons x y)))
+(define (update-10 x y z) (cons 10 (cons (cons x y) z)))
+(define (hint-11 x y) (cons 11 (cons x y)))
+(define lootru 0)
+(define loofal 1)
+
+(define test-tree (cons (cons 4 5) 3))
+(define decrement-4-core
+  (cons
+   (if-6 (=-5 (get-0 (nock-car (nock-cdr nock-here))) (inc-4 (get-0 (nock-cdr (nock-cdr nock-here)))))
+    (get-0 (nock-cdr (nock-cdr nock-here)))
+    (call-9 (nock-car nock-here) (update-10 (nock-cdr (nock-cdr nock-here)) (inc-4 (get-0 (nock-cdr (nock-cdr nock-here)))) (get-0 nock-here))))
+   (cons 4 0)))
+
+(define (nock-test subject formula) (nock-noun subject formula '() test-err-k '()))
+
+; rb - err trace
+(define (test-err-k)
+ (printf "Error: ~v" ra)
+ (error 'nock-err))
+
+(check-equal? (nock-test test-tree (get-0 nock-here) ) test-tree "tree address 1")
+(check-equal? (nock-test test-tree (get-0 (nock-car nock-here))) (car test-tree) "tree address 2")
+(check-equal? (nock-test test-tree (get-0 (nock-cdr nock-here))) (cdr test-tree) "tree address 3")
+(check-equal? (nock-test test-tree (get-0 (nock-car (nock-car nock-here)))) (car (car test-tree)) "tree address 4")
+(check-equal? (nock-test test-tree (get-0 (nock-cdr (nock-car nock-here)))) (cdr (car test-tree)) "tree address 5")
+(check-equal? (nock-test 0 (literal-1 test-tree)) test-tree "literal")
+(check-equal? (nock-test 0 (eval-2 (literal-1 test-tree) (literal-1 (get-0 2)))) (car test-tree) "eval")
+(check-equal? (nock-test test-tree (cell?-3 (get-0 1))) lootru "test cell true")
+(check-equal? (nock-test test-tree (cell?-3 (get-0 3))) loofal "test cell false")
+(check-equal? (nock-test 0 (inc-4 (literal-1 0))) 1 "increment")
+(check-equal? (nock-test test-tree (=-5 (literal-1 test-tree) (get-0 1))) lootru "test equals true")
+(check-equal? (nock-test test-tree (=-5 (literal-1 test-tree) (get-0 2))) loofal "test equals false")
+(check-equal? (nock-test test-tree (if-6 (literal-1 lootru) (literal-1 5) (get-0 100))) 5 "test if tru")
+(check-equal? (nock-test test-tree (if-6 (literal-1 loofal) (get-0 100) (literal-1 5))) 5 "test if false")
+(check-equal? (nock-test 0 (compose-7 (literal-1 test-tree) (get-0 2))) (car test-tree) "test compose")
+(check-equal? (nock-test 0 (declare-8 (literal-1 test-tree) (get-0 2))) test-tree "test declare")
+(check-equal? (nock-test 0 (call-9 (nock-car nock-here) (literal-1 decrement-4-core))) 3 "test call")
+(check-equal? (nock-test 0 (update-10 (nock-cdr nock-here) (literal-1 (cons 6 7)) (literal-1 test-tree))) (cons (cons 4 5) (cons 6 7)) "test update")
+(check-equal? (nock-test 0 (call-9 (nock-car nock-here) (update-10 (nock-car (nock-cdr nock-here)) (literal-1 8) (literal-1 decrement-4-core)))) 7 "test slam i.e. update sample and call")
+; test 11 static and dynamic