diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3aaebda
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+cos-lite-old.tal
+collapseos.bin
+*.rom
+blkfs
+blk0*
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..cf7069c
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "collapseos"]
+	path = collapseos
+	url = https://github.com/schierlm/collapseos
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..40aeefa
--- /dev/null
+++ b/README.md
@@ -0,0 +1,60 @@
+# collapseos-uxn
+
+Port of CollapseOS to uxn Tal
+
+## Description
+
+This is a port of [Collapse OS](http://collapseos.org/) (Snapshot 2022-05-09) to the
+[uxn](https://100r.co/site/uxn.html)/[varvara](https://wiki.xxiivv.com/site/varvara.html)
+virtual machine.
+
+Unlike other Collapse OS ports, it does not try to assemble the whole rom image
+using Collapse OS Forth. Instead it uses a two-step approach.
+
+The core image of the OS is assambled using [uxntal](https://wiki.xxiivv.com/site/uxntal.html),
+and will dynamically load a forth image from `collapseos.bin` at `$0800`, overwriting the
+initialization code that resided at that place previously. As uxntal is self-hosting on UXN,
+this shortcut was deemed acceptable to me. The tooling for uxntal in VS Code as well as UXN32
+debugger support made porting definitely faster for me that way. Also, the ISA/ABI is unstable
+enough to require three different uxnasm builds to compile for three different emulators, so
+building an assembler written in Forth is just not an option for me.
+
+Also note that the port was started at the CVM port and only implements the bare minimum
+of native words - first make it work, then make it faster.
+
+I was considering to use the native operand and return stack for the Forth operand and return
+stack, but ultimately decided against it. The event-driven nature of keyboard input would
+have required the `(key)` word to unwind the stack and store it elsewhere, and later restore
+once a key is pressed or the timer interrupt vector fires.
+
+Therefore, like most other ports, the Forth operand and return stack live in normal system memory;
+the stack pointers live in the zero page among other global variables.
+
+There are two versions. The normal version supports a block filesystem which may either exist as
+a single file named `blkfs`, or multiple files named `blk0000` to `blk9999`. At first startup
+the former file is converted to the latter form and then deleted. This design choice was driven
+by the fact that when *writing* files on varvara, there is no way to seek. Therefore writing each
+block into a separate file gets away with that limitation easily.
+
+The second, *lite* version does not support block filesystems, and does not require filesystem
+access. To use, you have to concatenate the forth image file to the core image file (which is `$0700`
+bytes long, making the forth image end up at `$0800`).
+
+It has been tested in the latest version of the UXN32 emulator (2022-04-26).
+There is also a version of the lite image available, which is built with an older
+version of uxnasm ([commit 8d14b4bbc6f1e50f313293ba301268fbc7d9090e](https://git.sr.ht/~rabbits/uxn/commit/8d14b4bbc6f1e50f313293ba301268fbc7d9090e),
+to be precise), which should work in the [WebUxn](https://aduros.com/webuxn/) emulator.
+
+## Download
+
+Have a look in the file release section if you want to download binaries to try.
+
+## License
+
+GPL3, just like Collapse OS
+
+## Moving forward
+
+Feel free to adopt this project if you find it interesting. I will follow Virgil's route and not update this project regularly.
+(The fact that there are different incompatible versions of uxn images, without even a version number for them, and some emulators
+get updated and some do not, has deterred me from keeping this up to date.)
diff --git a/collapseos b/collapseos
new file mode 160000
index 0000000..1752bf6
--- /dev/null
+++ b/collapseos
@@ -0,0 +1 @@
+Subproject commit 1752bf657a8aa4a641897ab783607501b88389ab
diff --git a/collapseos.tal b/collapseos.tal
new file mode 100644
index 0000000..f89d4b6
--- /dev/null
+++ b/collapseos.tal
@@ -0,0 +1,112 @@
+~common.tal
+
+@blkinit ( initialize blkfs )
+	#00 .File/append DEO
+	#0400 .File/addr(length) DEO2
+	RTN
+
+@blkfile "blk &startpos "000 &endpos "0 00
+
+@setblkname ( stack: blkno )
+	;blkfile/endpos SWP2 ( stack: charpos number )
+	&nameloop
+	#000a DIV2k SWP2 OVR2 MUL2 ROT2 SWP2 SUB2 #0030 ADD2 ROT2
+	( stack: number/10 number%10+'0' charpos )
+	STAk SWP2 POP2
+	DUP2 ;blkfile/startpos NEQ2 #77 ROT2 ROT2 #0001 SUB2 SWP2 ROT2 POP
+	( stack: charpos-1 number/10 cond )
+	,&nameloop JCN POP2 POP2 ( stack empty )
+	RTN
+
+@op-uxnStorage
+	;ppop JSR2 ;ppop JSR2 ;ppop JSR2 .ZP/tmp1 STZ2 ( tmp1 = block number ) .ZP/tmp2 STZ2 ( tmp2 = memory address )
+	SWP POP DUP #01 EQU ,&read JCN
+	#02 EQU ,&write JCN
+	;handler/stop JMP2
+	&read POP
+	.ZP/tmp1 LDZ2 ;setblkname JSR2
+	;blkfile .File/addr(name) DEO2
+	.ZP/tmp2 LDZ2 .File/addr(read) DEO2
+	;handler/next JMP2
+	&write
+	.ZP/tmp1 LDZ2 ;setblkname JSR2
+	;blkfile .File/addr(name) DEO2
+	.ZP/tmp2 LDZ2 .File/addr(write) DEO2
+	;handler/next JMP2
+
+|0800 @ROMSTART
+
+( ### initialization code - will be overwritten by ROM file ### )
+
+( variables used by initialization program )
+@infile "blkfs 00
+@romfile "collapseos.bin 00
+
+@init
+	#0000 .ZP/tmp1 STZ2 ( tmp1 = offset )
+	&copyfile ( copy blkfs to individual files )
+	( read block )
+	;infile .File/addr(name) DEO2
+	#0400 .File/addr(length) DEO2
+	.ZP/tmp1 LDZ2 ( stack: offs )
+	&readloop
+	;COPYBUF .File/addr(read) DEO2
+	DUP2 #0001 SUB2 SWP2 ( stack: offs-1 offs )
+	#0000 NEQ2 ,&readloop JCN POP2 ( stack empty )
+	.File/success DEI2 #0000 EQU2 ,&done JCN ( quit if EOF reached )
+	( now we need to update the file name )
+	.ZP/tmp1 LDZ2 ;setblkname JSR2
+	( write block )
+	;blkfile .File/addr(name) DEO2
+	#00 .File/append DEO
+	#0400 .File/addr(length) DEO2
+	;COPYBUF .File/addr(write) DEO2
+	.ZP/tmp1 LDZ2 INC2 .ZP/tmp1 STZ2
+	;&copyfile JMP2
+	&done
+	;infile .File/addr(name) DEO2
+	#01 .File/delete DEO
+	( initialize zero page )
+	PS_ADDR .ZP/psp STZ2
+	RS_ADDR .ZP/rsp STZ2
+	#ffff .ZP/ir STZ2
+	;ROMSTART .ZP/pc STZ2
+	#00 .KBuf/read STZ
+	#00 .KBuf/write STZ
+	#00 .KBuf/altgr-flag STZ
+	#00 .ZP/curX STZ
+	#00 .ZP/curY STZ
+	( initialize theme )
+	#0f0f .System/r DEO2
+	#0f0f .System/g DEO2
+	#0ff0 .System/b DEO2
+	( initialize and clear screen )
+	#0290 .Screen/width DEO2
+	#00d8 .Screen/height DEO2
+	.EmptySprite #00
+	&clearloop ADDk #00 SWP STZ INC DUP #08 LTH ,&clearloop JCN
+	ADD #fe SWP STZ
+	;EmptySprite .Screen/addr DEO2
+	#00 #00 ( stack: y x )
+	&lineloop
+	OVR INC #00 SWP #0008 MUL2 .Screen/y DEO2
+	&cellloop
+	DUP INC #00 SWP #0008 MUL2 .Screen/x DEO2
+	#49 .Screen/sprite DEO
+	INC DUP #50 LTH ,&cellloop JCN
+	POP INC #00 OVR #19 LTH ,&lineloop JCN
+	POP2
+	( prepare to read ROM )
+	;romfile .File/addr(name) DEO2
+	#2000 .File/addr(length) DEO2
+	;ROMSTART .File/addr(read)
+
+	( go to main program )
+	;main JMP2
+
+( copy buffer )
+|0a00 @COPYBUF $1
+
+( file device )
+|a0 @File [ &vector $2 &success $2 &addr(stat) $2 &delete $1 &append $1
+            &addr(name) $2 &addr(length) $2 &addr(read) $2 &addr(write) $2 ]
diff --git a/common.tal b/common.tal
new file mode 100644
index 0000000..31e781a
--- /dev/null
+++ b/common.tal
@@ -0,0 +1,350 @@
+( constants )
+%SYSVARS+#18 { #fe18 }
+%RS_ADDR { #ff00 }
+%PS_ADDR { #fffa }
+
+( macros )
+%MOD { DIVk MUL SUB }
+%MOD2 { DIV2k MUL2 SUB2 }
+%RTN { JMP2r }
+%HALF2 { DUP2 #8000 AND2 #01 SFT2 ORA2 } ( signed division by 2 )
+
+( zero page )
+|00 @ZP [ &psp $2 &rsp $2 &ir $2 &pc $2 &curX $1 &curY $1 &tmpX $1 &tmpY $1 &tmp1 $2 &tmp2 $2 ]
+
+( keyboard buffer )
+@KBuf [ &read $1 &write $1 &altgr-flag $1 &buf $10 ]
+
+( cursor sprite )
+|f0 @EmptySprite $1 @CursorSprite $8
+
+( devices )
+|00 @System [ &vector $2 &wst $1 &rst $1 &pad $4 &r $2 &g $2 &b $2 &debug $1 &halt $1 ]
+|10 @Console [ &vector $2 &read $1 &pad $5 &write $1 &error $1 ]
+|20 @Screen [ &vector $2 &width $2 &height $2 &pad $2 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1 ]
+|80 @Controller [ &vector $2 &button $1 &key $1 ]
+
+( stable ABI )
+|0100 ;init JMP2
+
+( main program )
+@main
+	( probably read ROM )
+	DEO2
+	( initialize file interface for blkfs )
+	;blkinit JSR2
+	( setup screen vector and keyboard vector )
+	;handler .Screen/vector DEO2
+	;key-handler .Controller/vector DEO2
+	BRK
+
+( utility functions )
+@ppeek ( read PSP and place on stack )
+	.ZP/psp LDZ2 LDA2
+	RTN
+
+@ppop ( read PSP and place on stack, then increment PSP )
+	,ppeek JSR .ZP/psp LDZ2 INC2 INC2 .ZP/psp STZ2
+	RTN
+
+@ppush ( decrement psp then store value from stack there )
+	.ZP/psp LDZ2 #0002 SUB2 DUP2 .ZP/psp STZ2 STA2
+	RTN
+
+@rpop ( read RSP and place on stack, then decrement RSP )
+	.ZP/rsp LDZ2 DUP2 LDA2 SWP2 #0002 SUB2 .ZP/rsp STZ2
+	RTN
+
+@rpush ( increment RSP then store value from stack there )
+	.ZP/rsp LDZ2 INC2 INC2 DUP2 .ZP/rsp STZ2 STA2
+	RTN
+
+@pc16 ( read WORD at PC to stack and increment PC )
+	.ZP/pc LDZ2 DUP2 LDA2 SWP2 INC2 INC2 .ZP/pc STZ2
+	RTN
+
+@jumptable ( jump table for commands )
+	( 00 ) :op-DUP :op-DROP :op-i>, :op-(i)>, :op-SWAP :op-OVER :op-ROT :op-lblnext
+	( 08 ) :op-(?br) :op-(next) :op-CALLi, :op-JMPi, :op-lblxt :op-EXIT :op-?DUP :op-(b)
+	( 10 ) :op-(n) :op-JMP(i), :op-lbldoes :op-lblval :op-uxnCell :op-EXECUTE :op-(key) :op-uxnStorage
+	( 18 ) :op-uxnDEI :op-uxnDEO :op-R~ :op-uxnDEI2 :op-+ :op-- :op-(br) :op-uxnDEO2
+	( 20 ) :op-* :op-< :op-/MOD :op-QUIT :op-ABORT :op-RCNT :op-NOT :op-AND
+	( 28 ) :op-OR :op-XOR :op-SCNT :op-BYE :op-R@ :op-R> :op->R :op-C@
+	( 30 ) :op-@ :op-! :op-C!
+
+@key-handler ( keyboard handler )
+	.Controller/key DEI
+	DUP #00 EQU ,&done JCN ( check for char )
+	.Controller/button DEI
+	( most of the code here is for handling AltGr keys, which create both Ctrl+Alt+X and Ctrl+Alt+special character )
+	DUP #fb AND #03 EQU ,&altgr-char JCN
+	#fb AND #00 EQU ,&normalkey JCN
+	,&done JMP
+	&altgr-char POP ( key is on stack )
+	.KBuf/altgr-flag LDZ #01 EQU ,&normalkey JCN
+	#01 .KBuf/altgr-flag STZ
+	,&done JMP
+	&normalkey
+	( normal key on stack - store to key buffer )
+	#00 .KBuf/altgr-flag STZ
+	.KBuf/write LDZ #01 ADD #10 MOD .KBuf/read LDZ EQU ,&done JCN ( check for room )
+	DUP .KBuf/write LDZ .KBuf/buf ADD STZ ( store char )
+	.KBuf/write LDZ #01 ADD #10 MOD .KBuf/write STZ ( increase pointer )
+	&done POP
+	BRK
+
+@handler ( run next command )
+	.ZP/pc LDZ2 #ffff EQU2 ,&done JCN
+	&next
+	.ZP/pc LDZ2 DUP2 INC2 .ZP/pc STZ2 LDA ( stack: op )
+	DUP #32 GTH ,&stop JCN
+	#00 SWP DUP2 ADD2 ;jumptable ADD2 LDA2 JMP2
+	&stop
+	#ffff .ZP/pc STZ2
+	&done
+	BRK
+
+@op-(br) ( branch IR to offset read at IR )
+	#00 .ZP/ir LDZ2 LDA DUP #80 LTH ,&positive JCN #0100 SUB2
+	&positive .ZP/ir LDZ2 ADD2 .ZP/ir STZ2
+	;handler/next JMP2
+
+@op-(?br)
+	;ppop JSR2 #0000 EQU2 ,op-(br) JCN
+	.ZP/ir LDZ2 INC2 .ZP/ir STZ2
+	;handler/next JMP2
+
+@op-(next)
+	;rpop JSR2 #0001 SUB2 DUP2 #0000 EQU2 ,&zero JCN
+		;rpush JSR2 ,op-(br) JMP
+	&zero POP2 .ZP/ir LDZ2 INC2 .ZP/ir STZ2
+	;handler/next JMP2
+
+@op-DUP
+	;ppeek JSR2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-?DUP
+	;ppeek JSR2 #0000 NEQ2 ,op-DUP JCN
+	;handler/next JMP2
+
+@op-DROP
+	;ppop JSR2 POP2
+	;handler/next JMP2
+
+@op-i>,
+	;pc16 JSR2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-(i)>,
+	;pc16 JSR2 LDA2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-SWAP
+	;ppop JSR2 ;ppop JSR2 SWP2 ;ppush JSR2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-OVER
+	;ppop JSR2 ;ppeek JSR2 SWP2 ;ppush JSR2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-ROT
+	;ppop JSR2 ;ppop JSR2 ;ppop JSR2 ROT2 ROT2 ;ppush JSR2 ;ppush JSR2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-lblnext ( pc = gw(ir); ir += 2 )
+	.ZP/ir LDZ2 DUP2 LDA2 .ZP/pc STZ2 INC2 INC2 .ZP/ir STZ2
+	;handler/next JMP2
+
+@op-CALLi,
+	.ZP/pc LDZ2 INC2 INC2 ;ppush JSR2
+	.ZP/pc LDZ2 LDA2 .ZP/pc STZ2
+	;handler/next JMP2
+
+@op-JMPi,
+	.ZP/pc LDZ2 LDA2 .ZP/pc STZ2
+	;handler/next JMP2
+
+@op-lblxt
+	.ZP/ir LDZ2 ;rpush JSR2
+	;ppop JSR2 DUP2 INC2 INC2 .ZP/ir STZ2
+	LDA2 .ZP/pc STZ2
+	;handler/next JMP2
+
+@op-EXIT
+	;rpop JSR2 .ZP/ir STZ2
+	;handler/next JMP2
+
+@op-(b)
+	.ZP/ir LDZ2 DUP2 LDA #00 SWP ;ppush JSR2 INC2 .ZP/ir STZ2
+	;handler/next JMP2
+
+@op-(n)
+	.ZP/ir LDZ2 DUP2 LDA2 ;ppush JSR2 INC2 INC2 .ZP/ir STZ2
+	;handler/next JMP2
+
+@op-JMP(i),
+	.ZP/pc LDZ2 LDA2 LDA2 .ZP/pc STZ2
+	;handler/next JMP2
+
+@op-lbldoes
+	;ppop JSR2 DUP2 INC2 INC2 ;ppush JSR2
+	LDA2 .ZP/pc STZ2
+	;handler/next JMP2
+
+@op-lblval
+	SYSVARS+#18 LDA #00 EQU ,&zero JCN
+	#00 SYSVARS+#18 STA
+	;ppop JSR2 ;ppop JSR2 SWP2 STA2
+	,&done JMP
+	&zero
+	;ppop JSR2 LDA2 ;ppush JSR2
+	&done
+	.ZP/ir LDZ2 DUP2 LDA2 .ZP/pc STZ2 INC2 INC2 .ZP/ir STZ2
+	;handler/next JMP2
+
+@op-uxnCell
+	;ppop JSR2 .ZP/tmp1 STZ2 ( tmp1 = font address )
+	;ppop JSR2 SWP POP .ZP/tmpY STZ ( tmpY = y coordinate )
+	;ppop JSR2 SWP POP .ZP/tmpX STZ ( tmpX = x coordinate )
+	;ppop JSR2 SWP POP .ZP/tmp2 STZ ( tmp2 = character )
+	.ZP/tmp2 LDZ #20 LTH ,&cursor JCN
+
+	#00 .ZP/tmpY LDZ INC2 #0008 MUL2 .Screen/y DEO2
+	#00 .ZP/tmpX LDZ INC2 #0008 MUL2 .Screen/x DEO2
+	#00 .ZP/tmp2 LDZ #20 SUB #0007 MUL2 .ZP/tmp1 LDZ2 ADD2 .Screen/addr DEO2
+	#49 .Screen/sprite DEO
+	;CursorSprite .Screen/addr DEO2
+	#4a .Screen/sprite DEO
+	,&done JMP
+	&cursor
+	;CursorSprite .Screen/addr DEO2
+	#00 .ZP/curY LDZ INC2 #0008 MUL2 .Screen/y DEO2
+	#00 .ZP/curX LDZ INC2 #0008 MUL2 .Screen/x DEO2
+	#4a .Screen/sprite DEO
+	.ZP/tmpX LDZ .ZP/curX STZ
+	.ZP/tmpY LDZ .ZP/curY STZ
+	#00 .ZP/curY LDZ INC2 #0008 MUL2 .Screen/y DEO2
+	#00 .ZP/curX LDZ INC2 #0008 MUL2 .Screen/x DEO2
+	#4f .Screen/sprite DEO
+
+	&done
+	;handler/next JMP2
+
+@op-EXECUTE
+	;ppop JSR2 .ZP/pc STZ2
+	;handler/next JMP2
+
+@op-(key)
+	.KBuf/read LDZ .KBuf/write LDZ EQU ,&nokey JCN
+	#00 .KBuf/read LDZ DUP INC #10 MOD .KBuf/read STZ .KBuf/buf ADD LDZ ;ppush JSR2
+	#0001 ;ppush JSR2
+	;handler/next JMP2
+	&nokey
+	#0000 ;ppush JSR2
+	;handler/done JMP2
+
+@op-R~
+	;rpop JSR2 POP2
+	;handler/next JMP2
+
+@op-+
+	;ppop JSR2 ;ppop JSR2 ADD2 ;ppush JSR2
+	;handler/next JMP2
+
+@op--
+	;ppop JSR2 ;ppop JSR2 SWP2 SUB2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-<
+	#00 ;ppop JSR2 ;ppop JSR2 GTH2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-NOT
+	#00 ;ppop JSR2 #0000 EQU2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-AND
+	;ppop JSR2 ;ppop JSR2 AND2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-OR
+	;ppop JSR2 ;ppop JSR2 ORA2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-XOR
+	;ppop JSR2 ;ppop JSR2 EOR2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-*
+	;ppop JSR2 ;ppop JSR2 MUL2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-/MOD
+	;ppop JSR2 DUP2 ;ppop JSR2 SWP2 OVR2 SWP2
+	MOD2 ;ppush JSR2 SWP2 DIV2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-QUIT
+	RS_ADDR .ZP/rsp STZ2
+	;handler/next JMP2
+
+@op-ABORT
+	PS_ADDR .ZP/psp STZ2
+	;handler/next JMP2
+
+@op-RCNT
+	.ZP/rsp LDZ2 RS_ADDR SUB2 HALF2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-SCNT
+	PS_ADDR .ZP/psp LDZ2 SUB2 HALF2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-BYE
+	#ffff .ZP/pc STZ2
+	;handler/done JMP2
+
+@op-R@
+	.ZP/rsp LDZ2 LDA2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-R>
+	;rpop JSR2 ;ppush JSR2
+	;handler/next JMP2
+
+@op->R
+	;ppop JSR2 ;rpush JSR2
+	;handler/next JMP2
+
+@op-C@
+	#00 ;ppop JSR2 LDA ;ppush JSR2
+	;handler/next JMP2
+
+@op-@
+	;ppop JSR2 LDA2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-!
+	;ppop JSR2 ;ppop JSR2 SWP2 STA2
+	;handler/next JMP2
+
+@op-C!
+	;ppop JSR2 ;ppop JSR2 SWP2 STA POP
+	;handler/next JMP2
+
+@op-uxnDEI
+	;ppop JSR2 DEI ;ppush JSR2
+	;handler/next JMP2
+
+@op-uxnDEO
+	;ppop JSR2 SWP POP ;ppop JSR2 SWP POP SWP DEO
+	;handler/next JMP2
+
+@op-uxnDEI2
+	;ppop JSR2 SWP POP DEI2 ;ppush JSR2
+	;handler/next JMP2
+
+@op-uxnDEO2
+	;ppop JSR2 ;ppop JSR2 SWP2 SWP POP DEO2
+	;handler/next JMP2
diff --git a/compile.sh b/compile.sh
new file mode 100755
index 0000000..6cbf012
--- /dev/null
+++ b/compile.sh
@@ -0,0 +1,24 @@
+#!/bin/sh -e
+if [ ! -f collapseos/README ]; then
+	git submodule init
+	git submodule update
+fi
+cd collapseos
+if [ ! -f tools/blkpack ]; then
+	git stash push --all
+	cd tools
+	make blkpack
+	cd ../cvm
+	make stage
+	cd ..
+fi
+cd ..
+collapseos/tools/blkpack < collapseos/blk.fs > blkfs
+collapseos/cvm/stage blkfs <xcomp.fs >collapseos.bin
+uxnasm collapseos.tal collapseos.rom
+uxnasm cos-lite.tal cos-lite.rom
+cat common.tal cos-lite.tal >cos-lite-old.tal
+patch <cos-lite-old.patch
+uxnasm-old cos-lite-old.tal cos-lite-old.rom
+cat collapseos.bin >>cos-lite.rom
+cat collapseos.bin >>cos-lite-old.rom
\ No newline at end of file
diff --git a/cos-lite-old.patch b/cos-lite-old.patch
new file mode 100644
index 0000000..26f22d0
--- /dev/null
+++ b/cos-lite-old.patch
@@ -0,0 +1,77 @@
+--- cos-lite-old.tal
++++ cos-lite-old.tal
+@@ -1,3 +1,6 @@
++( collapseOS without filesystem support - for old uxnasm commit 8d14b4bbc6f1e50f313293ba301268fbc7d9090e
++  for https://aduros.com/webuxn/ )
++
+ ( constants )
+ %SYSVARS+#18 { #fe18 }
+ %RS_ADDR { #ff00 }
+@@ -9,6 +12,9 @@
+ %RTN { JMP2r }
+ %HALF2 { DUP2 #8000 AND2 #01 SFT2 ORA2 } ( signed division by 2 )
+ 
++%INC2 { #0001 ADD2 }
++%INC { #01 ADD }
++
+ ( zero page )
+ |00 @ZP [ &psp $2 &rsp $2 &ir $2 &pc $2 &curX $1 &curY $1 &tmpX $1 &tmpY $1 &tmp1 $2 &tmp2 $2 ]
+ 
+@@ -21,7 +27,7 @@
+ ( devices )
+ |00 @System [ &vector $2 &wst $1 &rst $1 &pad $4 &r $2 &g $2 &b $2 &debug $1 &halt $1 ]
+ |10 @Console [ &vector $2 &read $1 &pad $5 &write $1 &error $1 ]
+-|20 @Screen [ &vector $2 &width $2 &height $2 &pad $2 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1 ]
++|20 @Screen [ &vector $2 &width $2 &height $2 &pad $2 &x $2 &y $2 &addr $2 &color $1 ]
+ |80 @Controller [ &vector $2 &button $1 &key $1 ]
+ 
+ ( stable ABI )
+@@ -213,20 +219,20 @@
+ 	#00 .ZP/tmpY LDZ INC2 #0008 MUL2 .Screen/y DEO2
+ 	#00 .ZP/tmpX LDZ INC2 #0008 MUL2 .Screen/x DEO2
+ 	#00 .ZP/tmp2 LDZ #20 SUB #0007 MUL2 .ZP/tmp1 LDZ2 ADD2 .Screen/addr DEO2
+-	#49 .Screen/sprite DEO
++	#29 .Screen/color DEO
+ 	;CursorSprite .Screen/addr DEO2
+-	#4a .Screen/sprite DEO
++	#32 .Screen/color DEO
+ 	,&done JMP
+ 	&cursor
+ 	;CursorSprite .Screen/addr DEO2
+ 	#00 .ZP/curY LDZ INC2 #0008 MUL2 .Screen/y DEO2
+ 	#00 .ZP/curX LDZ INC2 #0008 MUL2 .Screen/x DEO2
+-	#4a .Screen/sprite DEO
++	#32 .Screen/color DEO
+ 	.ZP/tmpX LDZ .ZP/curX STZ
+ 	.ZP/tmpY LDZ .ZP/curY STZ
+ 	#00 .ZP/curY LDZ INC2 #0008 MUL2 .Screen/y DEO2
+ 	#00 .ZP/curX LDZ INC2 #0008 MUL2 .Screen/x DEO2
+-	#4f .Screen/sprite DEO
++	#31 .Screen/color DEO
+ 
+ 	&done
+ 	;handler/next JMP2
+@@ -348,8 +354,6 @@
+ @op-uxnDEO2
+ 	;ppop JSR2 ;ppop JSR2 SWP2 SWP POP DEO2
+ 	;handler/next JMP2
+-( collapseOS without filesystem support )
+-~common.tal
+ 
+ @blkinit RTN
+ 
+@@ -383,12 +387,12 @@
+ 	OVR INC #00 SWP #0008 MUL2 .Screen/y DEO2
+ 	&cellloop
+ 	DUP INC #00 SWP #0008 MUL2 .Screen/x DEO2
+-	#49 .Screen/sprite DEO
++	#29 .Screen/color DEO
+ 	INC DUP #50 LTH ,&cellloop JCN
+ 	POP INC #00 OVR #19 LTH ,&lineloop JCN
+ 	POP2
+ 	( dummy device-out as replacement for loading ROM )
+-	#0000 .System/vector
++	;key-handler .Controller/vector
+ 	( go to main program )
+ 	;main JMP2
+ 
diff --git a/cos-lite.tal b/cos-lite.tal
new file mode 100644
index 0000000..35b3982
--- /dev/null
+++ b/cos-lite.tal
@@ -0,0 +1,45 @@
+( collapseOS without filesystem support )
+~common.tal
+
+@blkinit RTN
+
+@op-uxnStorage ;handler/stop JMP2
+
+@init
+	( initialize zero page )
+	PS_ADDR .ZP/psp STZ2
+	RS_ADDR .ZP/rsp STZ2
+	#ffff .ZP/ir STZ2
+	;ROMSTART .ZP/pc STZ2
+	#00 .KBuf/read STZ
+	#00 .KBuf/write STZ
+	#00 .KBuf/altgr-flag STZ
+	#00 .ZP/curX STZ
+	#00 .ZP/curY STZ
+	( initialize theme )
+	#0f0f .System/r DEO2
+	#0f0f .System/g DEO2
+	#0ff0 .System/b DEO2
+
+	( initialize and clear screen )
+	#0290 .Screen/width DEO2
+	#00d8 .Screen/height DEO2
+	.EmptySprite #00
+	&clearloop ADDk #00 SWP STZ INC DUP #08 LTH ,&clearloop JCN
+	ADD #fe SWP STZ
+	;EmptySprite .Screen/addr DEO2
+	#00 #00 ( stack: y x )
+	&lineloop
+	OVR INC #00 SWP #0008 MUL2 .Screen/y DEO2
+	&cellloop
+	DUP INC #00 SWP #0008 MUL2 .Screen/x DEO2
+	#49 .Screen/sprite DEO
+	INC DUP #50 LTH ,&cellloop JCN
+	POP INC #00 OVR #19 LTH ,&lineloop JCN
+	POP2
+	( dummy device-out as replacement for loading ROM )
+	#0000 .System/vector
+	( go to main program )
+	;main JMP2
+
+|07fe @ROMSTART 00 00
diff --git a/xcomp.fs b/xcomp.fs
new file mode 100644
index 0000000..520258c
--- /dev/null
+++ b/xcomp.fs
@@ -0,0 +1,77 @@
+2 CONSTS $fffa PS_ADDR $ff00 RS_ADDR
+$fe00 VALUE SYSVARS \ synced with vm.c
+SYSVARS $409 - VALUE BLK_MEM
+SYSVARS $80 + VALUE GRID_MEM
+GRID_MEM 2 + VALUE RXTX_MEM
+
+XCOMP FONTC
+
+1 TO BIGEND?
+
+: JMP(i), 17 C, M, ;
+: JMPi, 11 C, M, ;
+: CALLi, 10 C, M, ;
+: i>, 2 C, M, ;
+: (i)>, 3 C, M, ;
+
+XCOMPC
+
+$0800 XSTART
+
+0 JMPi, PC 2 - TO lblboot
+PC TO lblnext PC TO lblcell 7 C,
+PC TO lblxt 12 C,
+PC TO lbldoes 18 C,
+PC TO lblval 19 C,
+
+CODE * 32 C, ;CODE CODE /MOD 34 C, ;CODE
+CODE QUIT PC 35 C, 0 JMPi, PC 2 - TO lblmain
+CODE ABORT 36 C, JMPi, ( to QUIT )
+CODE EXIT 13 C, ;CODE CODE BYE 43 C,
+CODE RCNT 37 C, ;CODE CODE SCNT 42 C, ;CODE
+CODE (br) 30 C, ;CODE CODE (?br) 8 C, ;CODE
+CODE (next) 9 C, ;CODE
+CODE (b) 15 C, ;CODE CODE (n) 16 C, ;CODE
+
+CODE C@ 47 C, ;CODE CODE @ 48 C, ;CODE
+CODE C! 50 C, ;CODE CODE ! 49 C, ;CODE
+CODE NOT 38 C, ;CODE
+CODE AND 39 C, ;CODE CODE OR 40 C, ;CODE
+CODE XOR 41 C, ;CODE
+CODE + 28 C, ;CODE CODE - 29 C, ;CODE
+CODE < 33 C, ;CODE
+CODE R@ 44 C, ;CODE CODE R~ 26 C, ;CODE
+CODE R> 45 C, ;CODE CODE >R 46 C, ;CODE
+
+CODE DUP 0 C, ;CODE CODE DROP 1 C, ;CODE
+CODE ?DUP 14 C, ;CODE
+CODE SWAP 4 C, ;CODE CODE OVER 5 C, ;CODE
+CODE ROT 6 C, ;CODE
+CODE TICKS ;CODE
+CODE EXECUTE 21 C, ;CODE
+CODE uxnDEI 24 C, ;CODE
+CODE uxnDEO 25 C, ;CODE
+CODE uxnDEI2 27 C, ;CODE
+CODE uxnDEO2 31 C, ;CODE
+
+COREL
+
+CREATE ~FNT CPFNT7x7
+
+CODE (key?) 22 C, ;CODE
+CODE uxnStorage 23 C, ;CODE ( n blk( r/w )
+
+: (blk@) 1 uxnStorage ;
+: (blk!) 2 uxnStorage ;
+
+BLKSUB
+
+CODE uxnCell 20 C, ;CODE ( c x y fnt -- )
+
+: COLS 80 ; : LINES 25 ;
+: CELL! ( c pos -- ) COLS /MOD ~FNT uxnCell ;
+: CURSOR! ( new old -- ) DROP 0 SWAP CELL! ;
+
+GRIDSUB
+: INIT BLK$ GRID$ ;
+XWRAP