diff --git a/CONFIG.md b/CONFIG.md
index aace455b..edb75812 100644
--- a/CONFIG.md
+++ b/CONFIG.md
@@ -169,23 +169,13 @@ Allows to assign command to any function key, `RUN` key and `HELP` key (if selec
 
 Needs 25 bytes more space in KERNAL segment for the code. In addition, each configured key takes 3 bytes + length of the command.
 
-## Eye candy
+## Screen editor
 
-### `CONFIG_COLORS_BRAND`
+### `CONFIG_EDIT_STOPQUOTE`
 
-Tries to adjust the color scheme to the selected brand. Some brands might not support this.
+If enabled, STOP key terminates insert/quote mode (like on BlackBox cartridge).
 
-### `CONFIG_BANNER_SIMPLE`, `CONFIG_BANNER_FANCY`, `CONFIG_BANNER_BRAND`
-
-Select startup banner - either a simple one, or with some colorful elements. `CONFIG_BANNER_BRAND` heavily depends on the selected brand, not all the brands support it.
-
-Richer banners need more BASIC segment, varies between brands.
-
-### `CONFIG_BANNER_PAL_NTSC`
-
-If enabled, prints video system on startup banner. Eye candy only.
-
-Feature needs some bytes in BASIC (depending on banner type) and about 25 bytes in KERNAL segment.
+Feature needs 10 bytes in KERNAL segment. If unsure - enable.
 
 ## Software features
 
@@ -207,6 +197,24 @@ On the most widespread CPUs the D flag is not cleared upon entering interrupts.
 
 Feature needs 2 bytes in KERNAL segmment (for CPUs needing the patch), but at the same time allows optimizations allowing to gain some more bytes. If unsure - enable.
 
+## Eye candy
+
+### `CONFIG_COLORS_BRAND`
+
+Tries to adjust the color scheme to the selected brand. Some brands might not support this.
+
+### `CONFIG_BANNER_SIMPLE`, `CONFIG_BANNER_FANCY`, `CONFIG_BANNER_BRAND`
+
+Select startup banner - either a simple one, or with some colorful elements. `CONFIG_BANNER_BRAND` heavily depends on the selected brand, not all the brands support it.
+
+Richer banners need more BASIC segment, varies between brands.
+
+### `CONFIG_BANNER_PAL_NTSC`
+
+If enabled, prints video system on startup banner. Eye candy only.
+
+Feature needs some bytes in BASIC (depending on banner type) and about 25 bytes in KERNAL segment.
+
 ## Debug options
 
 Options in this section are for debug purposes only. If unsure - disable.
diff --git a/c64/,,config_generic.s b/c64/,,config_generic.s
index 9fdebcbd..f6e34b61 100644
--- a/c64/,,config_generic.s
+++ b/c64/,,config_generic.s
@@ -41,6 +41,7 @@
 // I/O devices
 
 #define CONFIG_IEC                // please keep enabled for now
+// #define CONFIG_IEC_JIFFYDOS    // please keep disabled for now
 // #define CONFIG_TAPE_NORMAL     // please keep disabled for now
 // #define CONFIG_TAPE_TURBO      // please keep disabled for now
 // #define CONFIG_RS232_UP2400    // please keep disabled for now
@@ -95,13 +96,9 @@
 .const CONFIG_KEYCMD_F14  = @""
 
 
-// Eye candy
+// Screen editor
 
-#define CONFIG_COLORS_BRAND
-// #define CONFIG_BANNER_SIMPLE
-#define CONFIG_BANNER_FANCY
-// #define CONFIG_BANNER_BRAND
-#define CONFIG_SHOW_PAL_NTSC
+#define CONFIG_EDIT_STOPQUOTE
 
 
 // Software features
@@ -111,6 +108,15 @@
 #define CONFIG_BCD_SAFE_INTERRUPTS
 
 
+// Eye candy
+
+#define CONFIG_COLORS_BRAND
+// #define CONFIG_BANNER_SIMPLE
+#define CONFIG_BANNER_FANCY
+// #define CONFIG_BANNER_BRAND
+#define CONFIG_SHOW_PAL_NTSC
+
+
 // Debug options
 
 // #define CONFIG_DBG_STUBS_BRK
diff --git a/c64/,,config_mega65.s b/c64/,,config_mega65.s
index 1f003c0b..6e9b9c84 100644
--- a/c64/,,config_mega65.s
+++ b/c64/,,config_mega65.s
@@ -43,6 +43,7 @@
 // I/O devices
 
 #define CONFIG_IEC                // please keep enabled for now
+// #define CONFIG_IEC_JIFFYDOS    // please keep disabled for now
 // #define CONFIG_TAPE_NORMAL     // please keep disabled for now
 // #define CONFIG_TAPE_TURBO      // please keep disabled for now
 // #define CONFIG_RS232_UP2400    // please keep disabled for now
@@ -97,13 +98,9 @@
 .const CONFIG_KEYCMD_F14  = @""
 
 
-// Eye candy
+// Screen editor
 
-#define CONFIG_COLORS_BRAND
-// #define CONFIG_BANNER_SIMPLE
-// #define CONFIG_BANNER_FANCY
-#define CONFIG_BANNER_BRAND
-// #define CONFIG_SHOW_PAL_NTSC
+#define CONFIG_EDIT_STOPQUOTE
 
 
 // Software features
@@ -113,6 +110,15 @@
 #define CONFIG_BCD_SAFE_INTERRUPTS
 
 
+// Eye candy
+
+#define CONFIG_COLORS_BRAND
+// #define CONFIG_BANNER_SIMPLE
+// #define CONFIG_BANNER_FANCY
+#define CONFIG_BANNER_BRAND
+// #define CONFIG_SHOW_PAL_NTSC
+
+
 // Debug options
 
 // #define CONFIG_DBG_STUBS_BRK
diff --git a/c64/,,config_testing.s b/c64/,,config_testing.s
index b8364118..01b3142b 100644
--- a/c64/,,config_testing.s
+++ b/c64/,,config_testing.s
@@ -42,6 +42,7 @@
 // I/O devices
 
 #define CONFIG_IEC                // please keep enabled for now
+// #define CONFIG_IEC_JIFFYDOS    // please keep disabled for now
 // #define CONFIG_TAPE_NORMAL     // please keep disabled for now
 // #define CONFIG_TAPE_TURBO      // please keep disabled for now
 // #define CONFIG_RS232_UP2400    // please keep disabled for now
@@ -96,13 +97,9 @@
 .const CONFIG_KEYCMD_F14  = @""
 
 
-// Eye candy
+// Screen editor
 
-// #define CONFIG_COLORS_BRAND
-// #define CONFIG_BANNER_SIMPLE
-#define CONFIG_BANNER_FANCY
-// #define CONFIG_BANNER_BRAND
-// #define CONFIG_SHOW_PAL_NTSC
+#define CONFIG_EDIT_STOPQUOTE
 
 
 // Software features
@@ -112,6 +109,15 @@
 #define CONFIG_BCD_SAFE_INTERRUPTS
 
 
+// Eye candy
+
+// #define CONFIG_COLORS_BRAND
+// #define CONFIG_BANNER_SIMPLE
+#define CONFIG_BANNER_FANCY
+// #define CONFIG_BANNER_BRAND
+// #define CONFIG_SHOW_PAL_NTSC
+
+
 // Debug options
 
 // #define CONFIG_DBG_STUBS_BRK
diff --git a/c64/,,config_ultimate64.s b/c64/,,config_ultimate64.s
index a1209988..3c829b77 100644
--- a/c64/,,config_ultimate64.s
+++ b/c64/,,config_ultimate64.s
@@ -41,6 +41,7 @@
 // I/O devices
 
 #define CONFIG_IEC                // please keep enabled for now
+// #define CONFIG_IEC_JIFFYDOS    // please keep disabled for now
 // #define CONFIG_TAPE_NORMAL     // please keep disabled for now
 // #define CONFIG_TAPE_TURBO      // please keep disabled for now
 // #define CONFIG_RS232_UP2400    // please keep disabled for now
@@ -95,13 +96,9 @@
 .const CONFIG_KEYCMD_F14  = @""
 
 
-// Eye candy
+// Screen editor
 
-#define CONFIG_COLORS_BRAND
-// #define CONFIG_BANNER_SIMPLE
-#define CONFIG_BANNER_FANCY
-// #define CONFIG_BANNER_BRAND
-#define CONFIG_SHOW_PAL_NTSC
+#define CONFIG_EDIT_STOPQUOTE
 
 
 // Software features
@@ -111,6 +108,15 @@
 #define CONFIG_BCD_SAFE_INTERRUPTS
 
 
+// Eye candy
+
+#define CONFIG_COLORS_BRAND
+// #define CONFIG_BANNER_SIMPLE
+#define CONFIG_BANNER_FANCY
+// #define CONFIG_BANNER_BRAND
+#define CONFIG_SHOW_PAL_NTSC
+
+
 // Debug options
 
 // #define CONFIG_DBG_STUBS_BRK
diff --git a/c64/aliases/,aliases_config.s b/c64/aliases/,aliases_config.s
index 3a231e52..23f5d173 100644
--- a/c64/aliases/,aliases_config.s
+++ b/c64/aliases/,aliases_config.s
@@ -109,6 +109,10 @@
 
 // Check that I/O configuration is correct
 {
+#if CONFIG_IEC_JIFFYDOS && !CONFIG_IEC
+	.error "CONFIG_IEC_JIFFYDOS requires CONFIG_IEC"
+#endif
+
 	.var selected_rs232 = 0;
 
 #if CONFIG_RS232_UP2400
diff --git a/c64/aliases/,aliases_ram_lowmem.s b/c64/aliases/,aliases_ram_lowmem.s
index 905446dc..10852ad2 100644
--- a/c64/aliases/,aliases_ram_lowmem.s
+++ b/c64/aliases/,aliases_ram_lowmem.s
@@ -154,8 +154,8 @@
 	.label LDTBL     = $D9  // $D9-$F2  screen line link table, [!] our usage is different  XXX give more details
 	.label USER      = $F3  // $F3-$F4  pointer to current color RAM location
 	.label KEYTAB    = $F5  // $F5-$F6  pointer to keyboard lookup table
-	.label RIBUF     = $F7  // $F7-$F8  -- NOT IMPLEMENTED --
-	.label ROBUF     = $F9  // $F9-$FA  -- NOT IMPLEMENTED --
+	.label RIBUF     = $F7  // $F7-$F8  -- NOT IMPLEMENTED -- XXX WIP
+	.label ROBUF     = $F9  // $F9-$FA  -- NOT IMPLEMENTED -- XXX WIP
 	//                 $FB     $FB-$FE  -- UNUSED --          free for user software
 	.label BASZPT    = $FF  //          -- NOT IMPLEMENTED --
 
@@ -202,10 +202,10 @@
 	.label BITNUM    = $298  //            -- NOT IMPLEMENTED --
 	.label BAUDOF    = $299  // $299-$29A  -- NOT IMPLEMENTED --
 #endif
-	.label RIDBE     = $29B  //            -- NOT IMPLEMENTED --
-	.label RIDBS     = $29C  //            -- NOT IMPLEMENTED --
-	.label RODBS     = $29D  //            -- NOT IMPLEMENTED --
-	.label RODBE     = $29E  //            -- NOT IMPLEMENTED --
+	.label RIDBE     = $29B  //            -- NOT IMPLEMENTED -- XXX WIP
+	.label RIDBS     = $29C  //            -- NOT IMPLEMENTED -- XXX WIP
+	.label RODBS     = $29D  //            -- NOT IMPLEMENTED -- XXX WIP
+	.label RODBE     = $29E  //            -- NOT IMPLEMENTED -- XXX WIP
 	.label IRQTMP    = $29F  // $29F-$2A0  -- NOT IMPLEMENTED --
 	.label ENABL     = $2A1  //            -- NOT IMPLEMENTED --
 	.label TODSNS    = $2A2  //            -- NOT IMPLEMENTED --
diff --git a/c64/kernal/screen/chrout_screen_clr.s b/c64/kernal/screen/chrout_screen_clr.s
new file mode 100644
index 00000000..ab9469dd
--- /dev/null
+++ b/c64/kernal/screen/chrout_screen_clr.s
@@ -0,0 +1,9 @@
+
+//
+// CLR key handling within CHROUT
+//
+
+chrout_screen_CLR:
+
+	jsr clear_screen
+	jmp chrout_screen_done
diff --git a/c64/kernal/screen/chrout_screen_control.s b/c64/kernal/screen/chrout_screen_control.s
index ff4f5706..61fa2f4e 100644
--- a/c64/kernal/screen/chrout_screen_control.s
+++ b/c64/kernal/screen/chrout_screen_control.s
@@ -15,7 +15,7 @@ chrout_screen_control:
 
 chrout_try_RETURN:
 
-	cmp #$0D
+	cmp #KEY_RETURN
 	bne !+
 
 	// RETURN clears quote and insert modes, it also clears reverse flag
@@ -27,156 +27,60 @@ chrout_try_RETURN:
 !:
 chrout_try_DEL:
 
-	cmp #$14
+	cmp #KEY_DEL
 	bne !+
-	jmp chrout_screen_del
+	jmp chrout_screen_DEL
 !:
+#if CONFIG_EDIT_STOPQUOTE
+chrout_try_STOP:
+
+	cmp #KEY_STOP
+	bne !+
+	
+	lda #$00
+	sta QTSW
+	sta INSRT
+	// Let it run, we are saving 3 bytes on JMP this way
+	// and the performance hit is not going to be visible nevertheless
+!:
+#endif
 chrout_try_quote:
 
 	lda QTSW
 	ora INSRT
 	beq !+
+	txa
 	jmp chrout_screen_quote
 !:
 	txa
 
-chrout_try_CRSR_UP:
+chrout_try_jumptable:
 
-	cmp #$91
+	ldx #(__chrout_screen_jumptable_codes_end - chrout_screen_jumptable_codes - 1)
+chrout_try_jumptable_loop:
+	cmp chrout_screen_jumptable_codes, x
 	bne !+
-
-	lda PNTR
-	sec
-	sbc #40
-	sta PNTR
-	jmp chrout_screen_calc_lptr_done
+	// Found, perform a jump to subroutine
+	lda chrout_screen_jumptable_hi, x
+	pha
+	lda chrout_screen_jumptable_lo, x
+	pha
+	rts
 !:
-chrout_try_CRSR_DOWN:
+	dex
+	bpl chrout_try_jumptable_loop
 
-	cmp #$11
-	bne !+
-
-	lda PNTR
-	clc
-	adc #40
-	sta PNTR
-	// We need to advance the pointer manually, as normalising
-	// now will break things. The pointer update is required
-	// so that we can tell if we really are on the bottom phys
-	// screen line or not
-	jsr screen_scroll_up_if_on_last_line
-	jmp chrout_screen_calc_lptr_done
-!:
-chrout_try_CRSR_LEFT:
-
-	cmp #$9D
-	bne !+
-
-	lda TBLX
-	ora PNTR
-	beq crsr_l1 // recalculating pointer is not really necessary, but this is a very rare case nevertheless
-	dec PNTR
-crsr_l1:
-	jmp chrout_screen_calc_lptr_done
-!:
-chrout_try_CRSR_RIGHT:
-
-	cmp #$1D
-	bne !+
-
-	inc PNTR
-	jmp chrout_screen_calc_lptr_done
-!:
-chrout_try_RVS_ON:
-
-	cmp #$12
-	bne !+
-
-	lda #$80
-	bne rvs_l1
-!:
-chrout_try_RVS_OFF:
-
-	cmp #$92
-	bne !+
-
-	lda #$00
-rvs_l1:
-	sta RVS
-	jmp chrout_screen_done
-!:
-chrout_try_MODE_GFX:
-
-	cmp #$8E
-	bne !+
-
-	lda VIC_YMCSB
-	and #$02 // to upper case
-mode_l1:
-	sta VIC_YMCSB
-	jmp chrout_screen_done
-!:
-chrout_try_MODE_TXT:
-
-	cmp #$0E
-	bne !+
-
-	lda VIC_YMCSB
-	ora #$02    // to lower case
-	bne mode_l1 // branch always
-!:
 chrout_try_COLOR:
 
 	ldx #$0F
-colour_check_loop:	
+chrout_try_color_loop:	
 	cmp colour_codes,x
 	bne !+
 	stx COLOR
 	jmp chrout_screen_done
 !:	
 	dex
-	bpl colour_check_loop
-
-chrout_try_SHIFT_ENABLE:
-
-	cmp #$09
-	bne !+
-
-	lda #$00 // enable SHIFT+VENDOR combination
-	sta MODE
+	bpl chrout_try_color_loop
 
+	// Unknown code, or key not requiring any handling
 	jmp chrout_screen_done
-!:
-chrout_try_SHIFT_DISABLE:
-
-	cmp #$08
-	bne !+
-
-	lda #$80 // disable SHIFT+VENDOR combination
-	sta MODE
-
-	jmp chrout_screen_done
-!:
-chrout_try_HOME:
-
-	cmp #$13
-	bne !+
-
-	jsr cursor_home
-	jmp chrout_screen_done
-!:
-chrout_try_CLR:
-
-	cmp #$93
-	bne !+
-
-	jsr clear_screen
-clr_l1:
-	jmp chrout_screen_done
-!:
-chrout_try_INS:
-
-	cmp #$94
-	bne clr_l1 // unknown code or key does not need handling
-
-	jmp chrout_screen_ins
diff --git a/c64/kernal/screen/chrout_screen_crsr.s b/c64/kernal/screen/chrout_screen_crsr.s
new file mode 100644
index 00000000..7f6cbffb
--- /dev/null
+++ b/c64/kernal/screen/chrout_screen_crsr.s
@@ -0,0 +1,40 @@
+
+//
+// Cursor keys handling within CHROUT
+//
+
+
+chrout_screen_CRSR_UP:
+
+	lda PNTR
+	sec
+	sbc #40
+	sta PNTR
+	jmp chrout_screen_calc_lptr_done
+
+chrout_screen_CRSR_DOWN:
+
+	lda PNTR
+	clc
+	adc #40
+	sta PNTR
+	// We need to advance the pointer manually, as normalising
+	// now will break things. The pointer update is required
+	// so that we can tell if we really are on the bottom phys
+	// screen line or not
+	jsr screen_scroll_up_if_on_last_line
+	jmp chrout_screen_calc_lptr_done
+
+chrout_screen_CRSR_LEFT:
+
+	lda TBLX
+	ora PNTR
+	beq !+ // recalculating pointer is not really necessary, but this is a very rare case nevertheless
+	dec PNTR
+!:
+	jmp chrout_screen_calc_lptr_done
+
+chrout_screen_CRSR_RIGHT:
+
+	inc PNTR
+	jmp chrout_screen_calc_lptr_done
diff --git a/c64/kernal/screen/chrout_screen_del.s b/c64/kernal/screen/chrout_screen_del.s
index 135f4777..88a403b2 100644
--- a/c64/kernal/screen/chrout_screen_del.s
+++ b/c64/kernal/screen/chrout_screen_del.s
@@ -3,7 +3,7 @@
 // CHROUT routine - screen support, DEL key handling
 //
 
-chrout_screen_del:
+chrout_screen_DEL:
 
 	// In insert mode it embeds control character
 	ldx INSRT
diff --git a/c64/kernal/screen/chrout_screen_gfxtxt.s b/c64/kernal/screen/chrout_screen_gfxtxt.s
new file mode 100644
index 00000000..e523e03b
--- /dev/null
+++ b/c64/kernal/screen/chrout_screen_gfxtxt.s
@@ -0,0 +1,19 @@
+
+//
+// GFX/TXT mode switch handling within CHROUT
+//
+
+
+chrout_screen_GFX:
+
+	lda VIC_YMCSB
+	and #$02 // to upper case
+!:
+	sta VIC_YMCSB
+	jmp chrout_screen_done
+
+chrout_screen_TXT:
+
+	lda VIC_YMCSB
+	ora #$02    // to lower case
+	bne !-      // branch always
diff --git a/c64/kernal/screen/chrout_screen_home.s b/c64/kernal/screen/chrout_screen_home.s
new file mode 100644
index 00000000..77976bd0
--- /dev/null
+++ b/c64/kernal/screen/chrout_screen_home.s
@@ -0,0 +1,10 @@
+
+//
+// HOME key handling within CHROUT
+//
+
+
+chrout_screen_HOME:
+
+	jsr cursor_home
+	jmp chrout_screen_done
diff --git a/c64/kernal/screen/chrout_screen_ins.s b/c64/kernal/screen/chrout_screen_ins.s
index 8e0e7f63..3082012a 100644
--- a/c64/kernal/screen/chrout_screen_ins.s
+++ b/c64/kernal/screen/chrout_screen_ins.s
@@ -3,7 +3,7 @@
 // CHROUT routine - screen support, INS key handling
 //
 
-chrout_screen_ins:
+chrout_screen_INS:
 
 	// Insert (shift-DELETE)
 	
diff --git a/c64/kernal/screen/chrout_screen_jumptable_codes.s b/c64/kernal/screen/chrout_screen_jumptable_codes.s
new file mode 100644
index 00000000..28bef1cf
--- /dev/null
+++ b/c64/kernal/screen/chrout_screen_jumptable_codes.s
@@ -0,0 +1,55 @@
+
+//
+// Jumptable for screen control coldes support. To improve performance, should be sorted
+// starting from the least probable routine
+//
+
+chrout_screen_jumptable_codes:
+
+	.byte KEY_INS
+	.byte KEY_CLR 
+	.byte KEY_HOME
+	.byte KEY_SHIFT_OFF
+	.byte KEY_SHIFT_ON
+	.byte KEY_TXT
+	.byte KEY_GFX
+	.byte KEY_RVS_OFF
+	.byte KEY_RVS_ON
+	.byte KEY_CRSR_RIGHT
+	.byte KEY_CRSR_LEFT
+	.byte KEY_CRSR_DOWN
+	.byte KEY_CRSR_UP
+
+__chrout_screen_jumptable_codes_end:
+
+chrout_screen_jumptable_lo:
+
+	.byte <(chrout_screen_INS        - 1)
+	.byte <(chrout_screen_CLR        - 1)
+	.byte <(chrout_screen_HOME       - 1)
+	.byte <(chrout_screen_SHIFT_OFF  - 1)
+	.byte <(chrout_screen_SHIFT_ON   - 1)
+	.byte <(chrout_screen_TXT        - 1)
+	.byte <(chrout_screen_GFX        - 1)
+	.byte <(chrout_screen_RVS_OFF    - 1)
+	.byte <(chrout_screen_RVS_ON     - 1)
+	.byte <(chrout_screen_CRSR_RIGHT - 1)
+	.byte <(chrout_screen_CRSR_LEFT  - 1)
+	.byte <(chrout_screen_CRSR_DOWN  - 1)
+	.byte <(chrout_screen_CRSR_UP    - 1)
+
+chrout_screen_jumptable_hi:
+
+	.byte >(chrout_screen_INS        - 1)
+	.byte >(chrout_screen_CLR        - 1)
+	.byte >(chrout_screen_HOME       - 1)
+	.byte >(chrout_screen_SHIFT_OFF  - 1)
+	.byte >(chrout_screen_SHIFT_ON   - 1)
+	.byte >(chrout_screen_TXT        - 1)
+	.byte >(chrout_screen_GFX        - 1)
+	.byte >(chrout_screen_RVS_OFF    - 1)
+	.byte >(chrout_screen_RVS_ON     - 1)
+	.byte >(chrout_screen_CRSR_RIGHT - 1)
+	.byte >(chrout_screen_CRSR_LEFT  - 1)
+	.byte >(chrout_screen_CRSR_DOWN  - 1)
+	.byte >(chrout_screen_CRSR_UP    - 1)
diff --git a/c64/kernal/screen/chrout_screen_rvs.s b/c64/kernal/screen/chrout_screen_rvs.s
new file mode 100644
index 00000000..b1f68b76
--- /dev/null
+++ b/c64/kernal/screen/chrout_screen_rvs.s
@@ -0,0 +1,17 @@
+
+//
+// RVS ON/OFF handling within CHROUT
+//
+
+
+chrout_screen_RVS_ON:
+
+	lda #$80
+	bne !+ // branch always
+
+chrout_screen_RVS_OFF:
+
+	lda #$00
+!:
+	sta RVS
+	jmp chrout_screen_done
diff --git a/c64/kernal/screen/chrout_screen_shift_onoff.s b/c64/kernal/screen/chrout_screen_shift_onoff.s
new file mode 100644
index 00000000..8f16587d
--- /dev/null
+++ b/c64/kernal/screen/chrout_screen_shift_onoff.s
@@ -0,0 +1,16 @@
+
+//
+// SHIFT ON/OFF handling within CHROUT
+//
+
+chrout_screen_SHIFT_ON:
+
+	lda #$00 // enable SHIFT+VENDOR combination
+!:
+	sta MODE
+	jmp chrout_screen_done
+
+chrout_screen_SHIFT_OFF:
+
+	lda #$80 // disable SHIFT+VENDOR combination
+	bne !-   // branch always