diff --git a/Makefile b/Makefile
index 8e39117..3dfd8ac 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@ all: kas
 kpc: vm/Makefile
 	@cd vm && make --no-print-directory -s verbose=yes
 
-kas: kpc as/regs.lst as/k-as.py
+kas: kpc as/k-as.py
 	@cp vm/ob/instrs.lst as
 
 dos: kas dosclean
diff --git a/as/k-as.py b/as/k-as.py
index 1b86c4e..2759334 100755
--- a/as/k-as.py
+++ b/as/k-as.py
@@ -25,7 +25,6 @@ instrs = TemporaryFile(mode="w+")
 b_data = TemporaryFile(mode="w+b")
 b_text = TemporaryFile(mode="w+b")
 
-lst_regs = open(os.path.join(sys.path[0], "regs.lst"))
 lst_instrs = open(os.path.join(sys.path[0], "instrs.lst"))
 
 main_src = open(sys.argv[1])
@@ -44,7 +43,6 @@ def leave(i):
     b_data.close()
     b_text.close()
     main_src.close()
-    lst_regs.close()
     lst_instrs.close()
     sys.exit(i)
 
@@ -53,9 +51,6 @@ def leave(i):
 # Defines
 pdefs = dict()
 
-# registers
-pregs = dict()
-
 # instructions
 pinstrs = list()
 
@@ -79,6 +74,32 @@ pcurfile = sys.argv[1]
 
 #-------------------------------------------------------------------------------
 
+pregs = {
+    '$r0': 0, '$rax': 0, '$r1': 1, '$rbx': 1,
+    '$r2': 2, '$rcx': 2, '$r3': 3, '$rdx': 3,
+    '$r4': 4, '$rsi': 4, '$r5': 5, '$rdi': 5,
+    '$r6': 6, '$ax0': 6, '$r7': 7, '$ax1': 7,
+    '$r8': 8, '$ax2': 8, '$r9': 9, '$ax3': 9,
+    '$r10': 10, '$ax4': 10, '$r11': 11, '$ax5': 11,
+    '$r12': 12, '$nx0': 12, '$r13': 13, '$nx1': 13,
+    '$r14': 14, '$nx2': 14, '$r15': 15, '$nx3': 15,
+    '$r16': 16, '$nx4': 16, '$r17': 17, '$nx5': 17,
+    '$r18': 18, '$nx6': 18, '$r19': 19, '$nx7': 19,
+    '$r20': 20, '$nx8': 20, '$r21': 21, '$grp': 21,
+    '$r22': 22, '$trp': 22, '$r23': 23, '$srp': 23,
+    '$r24': 24, '$tmp': 24, '$r25': 25, '$rad': 25,
+    '$r26': 26, '$cr0': 26, '$r27': 27, '$cr1': 27,
+    '$r28': 28, '$rip': 28, '$r29': 29, '$rbp': 29,
+    '$r30': 30, '$rsp': 30, '$r31': 31, '$zero': 31,
+}
+
+def parse_lst_instrs():
+    global pinstrs
+    for _, line in enumerate(lst_instrs):
+        pinstrs.append(line.strip())
+
+#-------------------------------------------------------------------------------
+
 def name_valid(name):
     for c in name.lower():
         if not(c in 'abcdefghijklmnopqrstuvwxyz0123456789[$._+]=,'):
@@ -103,26 +124,6 @@ def arith_eval(s):
 
 #-------------------------------------------------------------------------------
 
-def parse_lst_regs():
-    global pregs
-    i = 0
-    for _, line in enumerate(lst_regs):
-        line = line.strip()
-
-        if len(line) == 0:
-            continue
-
-        for reg in line.split():
-            pregs[reg] = i
-        i += 1
-
-def parse_lst_instrs():
-    global pinstrs
-    for _, line in enumerate(lst_instrs):
-        pinstrs.append(line.strip())
-
-#-------------------------------------------------------------------------------
-
 inc_depth = 0
 inc_depth_max = 16
 
@@ -770,7 +771,6 @@ def genout():
 #-------------------------------------------------------------------------------
 
 parse_lst_instrs()
-parse_lst_regs()
 do_includes(main_src)
 parse()
 gentext()
diff --git a/as/regs.lst b/as/regs.lst
deleted file mode 100644
index b47bcdc..0000000
--- a/as/regs.lst
+++ /dev/null
@@ -1,39 +0,0 @@
-$rax $r0
-$rbx $r1
-$rcx $r2
-$rdx $r3
-$rsi $r4
-$rdi $r5
-
-$ax0 $r6
-$ax1 $r7
-$ax2 $r8
-$ax3 $r9
-$ax4 $r10
-$ax5 $r11
-
-$nx0 $r12
-$nx1 $r13
-$nx2 $r14
-$nx3 $r15
-$nx4 $r16
-$nx5 $r17
-$nx6 $r18
-$nx7 $r19
-$nx8 $r20
-
-$grp $r21
-$trp $r22
-$srp $r23
-
-$tmp $r24
-$rad $r25
-
-$cr0 $r26
-$cr1 $r27
-
-$rip $r28
-$rbp $r29
-$rsp $r30
-
-$zero $r31
diff --git a/vm/in/ALU b/vm/in/ALU
index 57b819d..9538961 100644
--- a/vm/in/ALU
+++ b/vm/in/ALU
@@ -7,6 +7,7 @@
 
 # Bitwise NOT
 not 1
+not 2
 
 # Bitwise OR
 or 2
@@ -36,9 +37,11 @@ sar 3
 
 # Negation
 neg 1
+neg 2
 
 # Negation but traps on $src == -2^N
 negv 1
+negv 2
 
 # Addition
 add 2
diff --git a/vm/in/MEM b/vm/in/MEM
index 5e36dea..9f9a107 100644
--- a/vm/in/MEM
+++ b/vm/in/MEM
@@ -21,6 +21,7 @@ call 3
 #       POP(RIP)
 #
 ret 0
+ret 1
 
 #
 # Make new stack frame (ENTER)
diff --git a/vm/in/MISC b/vm/in/MISC
index c6bd9c9..54b447d 100644
--- a/vm/in/MISC
+++ b/vm/in/MISC
@@ -11,14 +11,14 @@
 #       (cause register dump on standard error)
 #       (wait for user input before proceeeding)
 #
-break
+break 0
 
 #
 # Toggles instruction dumping (DUMP)
 #
 #       (toggles instruction dumping)
 #
-dump
+dump 0
 
 #---------------------------------------------------------------------------#
 # Misc. instructions                                                        #
@@ -27,13 +27,13 @@ dump
 #
 # Throws #UDF ("undefined behaviour")
 #
-udf
+udf 0
 
 #
 # Pause the CPU for a very short amount of time (PAUSE)
 # Used in spin-type loops
 #
-pause
+pause 0
 
 #
 # Get timestamp in µseconds
@@ -50,7 +50,7 @@ ytime 0
 #
 # Clear all GPR registers except RBP/RSP
 #
-cls
+cls 0
 
 #---------------------------------------------------------------------------#
 # Byte-wise / bit-wise manipulation instructions                            #
diff --git a/vm/in/SUPER b/vm/in/SUPER
index fc5f541..17639ca 100644
--- a/vm/in/SUPER
+++ b/vm/in/SUPER
@@ -58,9 +58,6 @@ trap 1
 #
 iret 0
 
-cli 0
-sti 0
-
 #---------------------------------------------------------------------------#
 # Device control instructions                                               #
 #---------------------------------------------------------------------------#
diff --git a/vm/in/alu.c b/vm/in/alu.c
index fb3f037..04ead26 100644
--- a/vm/in/alu.c
+++ b/vm/in/alu.c
@@ -9,6 +9,7 @@
 //----------------------------------------------------------------------------//
 
 IMPL_START(not, 1) { SRCP(p1); *r1 = ~p1->val; return 1; }
+IMPL_START(not, 2) { SRCP(p2); *r1 = ~p2->val; return 1; }
 
 IMPL_START(or, 2) { SRCP(p1); SRCP(p2); *r1 = p1->val | p2->val; return 1; }
 IMPL_START(or, 3) { SRCP(p2); SRCP(p3); *r1 = p2->val | p3->val; return 1; }
@@ -41,6 +42,8 @@ IMPL_START(sar, 3) {
 //----------------------------------------------------------------------------//
 
 IMPL_START(neg, 1) { SRCP(p1); *r1 = ~p1->val + 1; return 1; }
+IMPL_START(neg, 2) { SRCP(p2); *r1 = ~p2->val + 1; return 1; }
+
 IMPL_START(negv, 1) {
     SRCP(p1);
 
@@ -52,6 +55,19 @@ IMPL_START(negv, 1) {
     return 1;
 }
 
+IMPL_START(negv, 2) {
+    SRCP(p2);
+
+    if (p2->val == (1ul<<63))
+        _except(E_OVF, "Ineffective NEG operation (NEGV)");
+
+    *r1 = ~p2->val + 1;
+
+    return 1;
+}
+
+//----------------------------------------------------------------------------//
+
 IMPL_START(add, 2) { SRCP(p1); SRCP(p2); *r1 = p1->val + p2->val; return 1; }
 IMPL_START(add, 3) { SRCP(p2); SRCP(p3); *r1 = p2->val + p3->val; return 1; }
 
diff --git a/vm/in/super.c b/vm/in/super.c
index b760666..28db13a 100644
--- a/vm/in/super.c
+++ b/vm/in/super.c
@@ -56,9 +56,6 @@ IMPL_START(iret, 0) {
     return 0;
 }
 
-IMPL_START(cli, 0) { CHK_SUPERV(); R(CR0) &= ~IF; return 0; }
-IMPL_START(sti, 0) { CHK_SUPERV(); R(CR0) |= IF; return 0; }
-
 //----------------------------------------------------------------------------//
 
 //