diff --git a/.build.yml b/.build.yml
index db70ad3..fdf6d47 100644
--- a/.build.yml
+++ b/.build.yml
@@ -1,17 +1,23 @@
 image: archlinux
 packages:
-  - mono
   - make
-  - sass
   - mktiupgrade
   - genkfs
   - mkrom
   - patchrom
 sources:
   - https://github.com/KnightOS/kernel
+  - https://github.com/KnightOS/scas
 environment:
   project: kernel
 tasks:
+  - scas: |
+      cd scas
+      mkdir build
+      cd build
+      cmake ..
+      make
+      sudo make install
   - ti73: |
       cd ${project}
       make TI73
diff --git a/LICENSE b/LICENSE
index d785a5c..33ca992 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2014 The KnightOS Group
+Copyright (c) 2014-2020 The KnightOS Group
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 
diff --git a/Makefile b/Makefile
index 404a655..6577714 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,13 @@
 # Makefile for KnightOS kernel
-AS=sass
-ASFLAGS=--encoding "Windows-1252"
+AS=scas
+ASFLAGS=-v
 .DEFAULT_GOAL=TI84pSE
 PLATFORM:=TI84pSE
-TAG:=$(shell git describe --abbrev=0)
+TAG:=$(shell git describe --abbrev=0 --dirty=+)
 OUTDIR=bin/
 
+KERNEL_VERSION = -DKERNEL_VERSION=$(TAG)
+
 # Platforms:
 # Variables (all in hex):
 #	PRIVILEGED: The address of the privileged page
@@ -65,7 +67,7 @@ TI84pCSE: BOOT := 3FC000
 TI84pCSE: LENGTH := 0x400000
 TI84pCSE: kernel $(OUTDIR)
 
-DEFINES=--define $(PLATFORM)
+DEFINES=--define $(PLATFORM) $(KERNEL_VERSION)
 BINDIR=$(OUTDIR)$(PLATFORM)/
 INCLUDE=include/;$(BINDIR)
 
@@ -109,28 +111,18 @@ baserom:
 	mkdir -p $(BINDIR)
 	mkrom $(BINDIR)kernel.rom $(LENGTH) /dev/null:0x00
 
-$(OUTDIR)$(PLATFORM)/00.bin: src/00/*.asm include/constants.asm src/00/jumptable.config
-	@mkdir -p $(BINDIR)
-	$(AS) $(ASFLAGS) $(DEFINES) --include "$(INCLUDE);src/00/" --symbols $(BINDIR)00.sym --listing $(BINDIR)00.list src/00/base.asm $(BINDIR)00.bin
-	patchrom src/00/jumptable.config $(BINDIR)kernel.rom 00 < $(BINDIR)00.sym > $(BINDIR)00.inc
-
-$(OUTDIR)$(PLATFORM)/01.bin: $(OUTDIR)$(PLATFORM)/00.bin src/01/*.asm include/constants.asm src/01/jumptable.config
+$(OUTDIR)$(PLATFORM)/%.bin: src/%/*.asm include/constants.asm src/%/jumptable.config
 	@mkdir -p $(BINDIR)
-	$(AS) $(ASFLAGS) $(DEFINES) --include "$(INCLUDE);src/01/" --symbols $(BINDIR)01.sym --listing $(BINDIR)01.list src/01/base.asm $(BINDIR)01.bin
-	patchrom src/01/jumptable.config $(BINDIR)kernel.rom 01 < $(BINDIR)01.sym > $(BINDIR)01.inc
-
-$(OUTDIR)$(PLATFORM)/02.bin: $(OUTDIR)$(PLATFORM)/00.bin src/02/*.asm include/constants.asm src/02/jumptable.config
-	@mkdir -p $(BINDIR)
-	$(AS) $(ASFLAGS) $(DEFINES) --include "$(INCLUDE);src/02/" --symbols $(BINDIR)02.sym --listing $(BINDIR)02.list src/02/base.asm $(BINDIR)02.bin
-	patchrom src/02/jumptable.config $(BINDIR)kernel.rom 02 < $(BINDIR)02.sym > $(BINDIR)02.inc
+	$(AS) $(ASFLAGS) $(DEFINES) --include "$(INCLUDE);src/$*/" --symbols $(BINDIR)$*.sym --listing $(BINDIR)$*.list src/$*/base.asm -o $(BINDIR)$*.bin
+	patchrom src/$*/jumptable.config $(BINDIR)kernel.rom $* < $(BINDIR)$*.sym > $(BINDIR)$*.inc
 
 $(OUTDIR)$(PLATFORM)/privileged.bin: src/privileged/*.asm include/constants.asm $(OUTDIR)$(PLATFORM)/00.bin
 	@mkdir -p $(BINDIR)
-	$(AS) $(ASFLAGS) $(DEFINES) --include "$(INCLUDE);src/privileged/" --listing $(BINDIR)priviledged.list src/privileged/base.asm $(BINDIR)privileged.bin
+	$(AS) $(ASFLAGS) $(DEFINES) --include "$(INCLUDE);src/privileged/" --listing $(BINDIR)priviledged.list src/privileged/base.asm -o $(BINDIR)privileged.bin
 
 $(OUTDIR)$(PLATFORM)/boot.bin: src/boot/*.asm include/constants.asm
 	@mkdir -p $(BINDIR)
-	$(AS) $(ASFLAGS) $(DEFINES) --include "$(INCLUDE);src/boot/" --listing $(BINDIR)boot.list src/boot/base.asm $(BINDIR)boot.bin
+	$(AS) $(ASFLAGS) $(DEFINES) --include "$(INCLUDE);src/boot/" --listing $(BINDIR)boot.list src/boot/base.asm -o $(BINDIR)boot.bin
 
 clean:
 	rm -rf $(OUTDIR)
diff --git a/mkfile b/mkfile
new file mode 100644
index 0000000..93f6739
--- /dev/null
+++ b/mkfile
@@ -0,0 +1,39 @@
+PLATFORM=TI73
+TAG=0.6.12
+AS=knightos/scas
+
+OUTDIR=bin/$PLATFORM
+ASFLAGS=-D$PLATFORM -DKERNEL_VERSION=$TAG -I include/ -I $OUTDIR/
+
+LENGTH=`{switch($PLATFORM){case TI84pCSE; echo 400000; case *pSE; echo 200000; case TI84p; echo 100000; case * ; echo 80000}}
+BOOT=`{echo 'ibase=16;obase=10;'^$LENGTH^'-4000'|bc}
+PRIV=`{echo 'ibase=16;obase=10;'^$LENGTH^'-10000'|bc}
+
+$OUTDIR/kernel.inc: include/kernel.inc include/defines.inc include/kernelmem.inc $OUTDIR/00.inc $OUTDIR/01.inc $OUTDIR/02.inc
+	cat $prereq > $target
+
+kernel:V: $OUTDIR/00.inc $OUTDIR/02.inc $OUTDIR/01.inc $OUTDIR/kernel.inc
+
+$OUTDIR/kernel.rom: $OUTDIR/00.bin $OUTDIR/01.bin $OUTDIR/02.bin $OUTDIR/boot.bin $OUTDIR/privileged.bin
+	knightos/mkrom $OUTDIR/kernel.rom 0x$LENGTH $OUTDIR/00.bin:0x00 $OUTDIR/01.bin:0x4000 $OUTDIR/02.bin:0x8000 $OUTDIR/boot.bin:0x$BOOT $OUTDIR/privileged.bin:0x$PRIV
+
+$OUTDIR/01.bin: $OUTDIR/00.bin
+$OUTDIR/02.bin: $OUTDIR/00.bin
+$OUTDIR/boot.bin: $OUTDIR/00.bin
+$OUTDIR/privileged.bin: $OUTDIR/00.bin
+
+00_SOURCES:V:src/00/base.asm src/00/boot.asm src/00/concurrency.asm src/00/crc.asm src/00/display-color.asm src/00/display.asm src/00/filestreams.asm src/00/filesystem.asm src/00/flash.asm src/00/header.asm src/00/interrupt.asm src/00/jumptable.config src/00/keyboard.asm src/00/libraries.asm src/00/link.asm src/00/locks.asm src/00/math.asm src/00/memory.asm src/00/panic.asm src/00/random.asm src/00/restarts.asm src/00/signals.asm src/00/strings.asm src/00/thread.asm src/00/util.asm
+01_SOURCES:V:src/01/base.asm src/01/font.asm src/01/jumptable.config src/01/text.asm 
+02_SOURCES:V:src/02/base.asm src/02/compression.asm src/02/crypto.asm src/02/fp-math.asm src/02/graphics.asm src/02/jumptable.config src/02/sort.asm src/02/strings.asm src/02/time.asm
+boot_SOURCES:V:src/boot/base.asm
+privileged_SOURCES:V:src/privileged/base.asm
+
+$OUTDIR/%.inc: $OUTDIR/%.bin $OUTDIR/kernel.rom
+	knightos/patchrom src/$stem/jumptable.config $OUTDIR/kernel.rom $stem < $OUTDIR/$stem.sym > $OUTDIR/$stem.inc
+
+$OUTDIR/%.bin:D:%_SOURCES include/constants.asm
+	mkdir -p $OUTDIR
+	$AS $ASFLAGS -I src/$stem/ --symbols $OUTDIR/$stem.sym --listing $OUTDIR/$stem.list src/$stem/base.asm -o $OUTDIR/$stem.bin
+
+clean:V:
+	rm -r $OUTDIR
diff --git a/src/00/header.asm b/src/00/header.asm
index 677f6d7..8efb5b1 100644
--- a/src/00/header.asm
+++ b/src/00/header.asm
@@ -44,5 +44,4 @@ rlcall:
 ; 0x0056
 .db 0xFF, 0xA5, 0xFF
 .fill 0x64-$
-.exec git describe --dirty=+ ; Version string
-.db 0
+.asciiz "KERNEL_VERSION"
diff --git a/src/00/locks.asm b/src/00/locks.asm
index 830e726..dd4a704 100644
--- a/src/00/locks.asm
+++ b/src/00/locks.asm
@@ -90,7 +90,7 @@ hasUSBLock:
     push hl
     push af
         call getCurrentThreadId
-        ld hl, hwLockUsb
+        ld hl, hwLockUSB
         cp (hl)
     pop hl
     ld a, h
diff --git a/src/00/random.asm b/src/00/random.asm
index 16f6088..75a53cd 100644
--- a/src/00/random.asm
+++ b/src/00/random.asm
@@ -47,7 +47,7 @@ getRandom:
         add hl, hl \ rl c \ rl b
         ld (random_seed+6), bc
         sbc a, a
-        and %11000101
+        and 0b11000101
         xor l
         ld l, a
         ld (random_seed+4), hl
diff --git a/src/02/crypto.asm b/src/02/crypto.asm
index eb4fd06..1b4f6b9 100644
--- a/src/02/crypto.asm
+++ b/src/02/crypto.asm
@@ -44,7 +44,7 @@ sha1Init:
 .defaultMemblock:
 
 ; Holds the completed hash.
-sha1_hash .equ $ - .defaultMemblock
+.equ sha1_hash, $ - .defaultMemblock
     .db 0x67,0x45,0x23,0x01
     .db 0xEF,0xCD,0xAB,0x89
     .db 0x98,0xBA,0xDC,0xFE
@@ -107,13 +107,13 @@ sha1Pad_noPush:
     ; append the bit '1' to the message
     ; append 0 <= k < 512 bits '0', so that the resulting message length (in bits)
     ;    is congruent to 448 = -64 (mod 512)
-    ld a, $80
+    ld a, 0x80
 .zero:
     call sha1AddByte_noLength
     ld a, (ix + sha1_block_front_ptr)
     add a, 56
     cp (ix + sha1_block_ptr)
-    ld a, $00
+    ld a, 0x00
     jr nz, .zero
     ; append length of message (before padding), in bits, as 64-bit big-endian integer
     push ix \ pop hl
@@ -223,10 +223,10 @@ sha1ProcessBlock:
         dec hl
         ld (ix + sha1_block_ptr), l
         ld (ix + sha1_block_ptr + 1), h
-        ld hl, sha1Operation_mux \ call sha1Do20Rounds \ .db $5A,$82,$79,$99
-        ld hl, sha1Operation_xor \ call sha1Do20Rounds \ .db $6E,$D9,$EB,$A1
-        ld hl, sha1Operation_maj \ call sha1Do20Rounds \ .db $8F,$1B,$BC,$DC
-        ld hl, sha1Operation_xor \ call sha1Do20Rounds \ .db $CA,$62,$C1,$D6
+        ld hl, sha1Operation_mux \ call sha1Do20Rounds \ .db 0x5A,0x82,0x79,0x99
+        ld hl, sha1Operation_xor \ call sha1Do20Rounds \ .db 0x6E,0xD9,0xEB,0xA1
+        ld hl, sha1Operation_maj \ call sha1Do20Rounds \ .db 0x8F,0x1B,0xBC,0xDC
+        ld hl, sha1Operation_xor \ call sha1Do20Rounds \ .db 0xCA,0x62,0xC1,0xD6
 
         ;    Add this chunk's hash to result so far
         ;    h0 += a
diff --git a/src/boot/base.asm b/src/boot/base.asm
index 7741975..854f2d4 100644
--- a/src/boot/base.asm
+++ b/src/boot/base.asm
@@ -1,7 +1,7 @@
 #include "constants.asm"
 ; Dummy boot page to get emulators to boot the OS
     jr _
-    .fill 0x0F - $
+    .block 0x0F - $
     .db "Emulated", 0
 _:
     in a, (PORT_FLASHRAMSIZE)