diff --git a/TODO.md b/TODO.md
new file mode 100644
index 0000000..4a4cb69
--- /dev/null
+++ b/TODO.md
@@ -0,0 +1,11 @@
+TODO:
+
+- fix setting of pointer @45 (new uridium fails to run!)
+- *DONE* properly save & restore device number (now set to 8)
+- finish the INSTALL utility program: all blocks
+- bootctl, prefs
+
+end 64  = 41349 = $a185 @45
+end 128 = 46469 = $b585 @174
+
+
diff --git a/defs.inc b/defs.inc
index 2cf1612..1d64f8c 100644
--- a/defs.inc
+++ b/defs.inc
@@ -1,31 +1,31 @@
-VIC2      = $D000  ; VIC-II base
-COLORAM   = $D800  ; color ram
+VIC2      = $D000   ; VIC-II register base
+COLORAM   = $D800   ; color memory
 
 SCROLY  = VIC2+$11
 RASTER  = VIC2+$12
 SCROLX  = VIC2+$16
-VICIRQ  = VIC2+$19 ; VIC Interrupt Flag Register
-IRQMASK = VIC2+$1A ; VIC IRQ Mask Register
-EXTCOL  = VIC2+$20 ; border color
-BGCOL0  = VIC2+$21 ; background color
+VICIRQ  = VIC2+$19  ; VIC Interrupt Flag Register
+IRQMASK = VIC2+$1A  ; VIC IRQ Mask Register
+EXTCOL  = VIC2+$20  ; border color
+BGCOL0  = VIC2+$21  ; background color
 BGCOL1  = VIC2+$22
 BGCOL2  = VIC2+$23
 
-CHROUT    = $FFD2  ; output character
-STOP      = $FFE1  ; check for stop key
+CHROUT    = $FFD2   ; output character
+STOP      = $FFE1   ; check for stop key
 
-T1     = $9E    ; Tape pass 1 error log index
-T2     = $9F    ; Tape pass 2 error log correction index
+T1     = $9E        ; Tape pass 1 error log index
+T2     = $9F        ; Tape pass 2 error log correction index
 
-TIME   = $A0    ; Software Jiffy Clock (2)
-SAL    = $AC    ; Pointer to the Starting Address of a Load/Screen Scrolling (2) (temporary)
-EAL    = $AE    ; Pointer to Ending Address of Load (2) (End of Program)
+TIME   = $A0        ; (3) Software Jiffy Clock 
+SAL    = $AC        ; (2) Pointer to the Starting Address of a Load/Screen Scrolling (temporary)
+EAL    = $AE        ; (2) Pointer to Ending Address of Load (End of Program)
 
-FA     = $BA    ; Current Device Number
-FNLEN  = $B7    ; Length of Current Filename
-FNADDR = $BB    ; Pointer: Current Filename (2)
+FA     = $BA        ; Current Device Number
+FNLEN  = $B7        ; Length of Current Filename
+FNADDR = $BB        ; (2) Pointer: Current Filename
 
-VICSCN  = $0400
+VICSCN  = $0400     ; default screen memory
 
 VICGO64 = VICSCN + 40*22
 VICAS64 = VICSCN + 40*15
diff --git a/raster.s b/raster.s
index e8c6135..65cdf57 100644
--- a/raster.s
+++ b/raster.s
@@ -18,49 +18,18 @@ print:  lda msg, x
         bne print
 done:
 
-; print end program address
-        lda TXTTAB+1
-        jsr hexout
-        lda TXTTAB
-        jsr hexout
-        lda #'-'
-        jsr CHROUT
-        lda VARTAB+1
-        jsr hexout
-        lda VARTAB
-        jsr hexout
-        lda #13
-        jsr CHROUT
-
         jsr raster_setup
 exit:
         lda #0
         sta resultRegister
         rts
 
-; print hex A
-hexout:
-        pha
-        lsr
-        lsr
-        lsr
-        lsr
-        jsr hexdig
-        pla
-        and #$0f
-hexdig:
-        cmp #$0a
-        bcc hdsk1
-        adc #$06
-hdsk1:  adc #$30
-        jsr CHROUT
-        rts
-
 .rodata
 msg:    .asciiz "HELLO RASTER WORLD "
 
 ; --------------------------
 
+.code
 raster_setup:
         sei
 
@@ -123,27 +92,32 @@ raster_chk_wait:
         bcs raster_do_call ; not a wait instruction
 raster_do_wait:
         cmp #0
-        beq raster_list_restart
+        beq raster_list_restart ; end of list reached
         stx RASTER
         iny
         sty T1
-        bne raster_rti
+        bne raster_rti          ; always, return from IRQ
         brk
 
 raster_do_call:
-        ; not implemented
+        ; not implemented yet
         iny
         sty T1
-        bne raster_exec
+        bne raster_exec         ; always
         brk
 
 raster_list_restart:
         ldy #0
         sty T1
-        beq raster_exec       ; always
+        beq raster_exec         ; always
 
 raster_rti:
-        jmp raster_cont
+        pla
+        tay
+        pla
+        tax
+        pla
+        rti
 
 raster_not:
         inc EXTCOL
@@ -152,11 +126,11 @@ raster_cont:
         jmp $ea31
 
 raster_list: 
-        .word 100 ; wait for line 100
-        .word $d020 ; set border to color 2
+        .word 100       ; wait for line 100
+        .word $d020     ; set border to color 2
         .byte 2
-        .word 200 ; wait for line 200
-        .word $d020 ; set border to color 3
+        .word 200       ; wait for line 200
+        .word $d020     ; set border to color 3
         .byte 2
         .word 0 ; end