diff --git a/CONFIG.md b/CONFIG.md
index 3df98c2d..13effa95 100644
--- a/CONFIG.md
+++ b/CONFIG.md
@@ -3,9 +3,11 @@
 
 It's not possible to provide ROM builds that suit everyone needs - therefore configuration files were introduced, few predefined configurations are provided with sane defaults:
 
+* [`c64/,,config_custom.s`](c64/,,config_custom.s)
 * [`c64/,,config_generic.s`](c64/,,config_generic.s)
 * [`c64/,,config_mega65.s`](c64/,,config_mega65.s)
 * [`c64/,,config_ultimate64.s`](c64/,,config_ultimate64.s)
+* [`c64/,,config_testing.s`](c64/,,config_testing.s)
 
 Just edit them and recompile the project. To enable particular option - uncomment it by removing leading `//` from before `#define` directive (as you probably guessed, commenting out disables it). Some options are followed by constants - you can change them too to further fine-tune the build.
 
@@ -27,6 +29,10 @@ Since Open ROMs is highly modular, it should be possible to add other platforms
 
 Select if the ROM is going to be used exclusively on the specific motherboard. It prevents from enabling options not having sense, skips initialization of C128-only registers, etc.
 
+### `CONFIG_BRAND_CUSTOM`
+
+Intended for custom builds, which are not to be redistributed. Allows to configure branding with `CONFIG_CUSTOM_BRAND` varaible
+
 ### `CONFIG_BRAND_GENERIC`
 
 If you don't know which variant to choose - select this one.
diff --git a/Makefile b/Makefile
index 39733b14..6e5edbf5 100644
--- a/Makefile
+++ b/Makefile
@@ -55,13 +55,14 @@ TOOLS_LIST = $(pathsubst src/tools/%,build/tools/%,$(basename $(SRC_TOOLS)))
 
 # List of targets
 
-STD_TARGET_LIST = build/kernal_generic.rom build/basic_generic.rom \
+STD_TARGET_LIST = build/kernal_custom.rom build/basic_custom.rom \
+                  build/kernal_generic.rom build/basic_generic.rom \
                   build/kernal_testing.rom build/basic_testing.rom \
                   build/kernal_mega65.rom build/basic_mega65.rom \
                   build/kernal_ultimate64.rom build/basic_ultimate64.rom \
                   build/chargen.rom
 
-EXT_TARGET_LIST = build/newc65.rom
+EXT_TARGET_LIST = build/mega65.rom
 
 REL_TARGET_LIST = $(pathsubst build/%,bin/%, $(STD_TARGET_LIST))
 
@@ -85,7 +86,7 @@ clean:
 
 updatebin:
 	$(MAKE) -j64 --output-sync=target $(STD_TARGET_LIST) $(EXT_TARGET_LIST) $(TOOL_RELEASE)
-	$(TOOL_RELEASE) -i ./build -o ./bin basic_generic.rom kernal_generic.rom basic_testing.rom kernal_testing.rom basic_mega65.rom kernal_mega65.rom basic_ultimate64.rom kernal_ultimate64.rom newc65.rom
+	$(TOOL_RELEASE) -i ./build -o ./bin basic_generic.rom kernal_generic.rom basic_testing.rom kernal_testing.rom basic_ultimate64.rom kernal_ultimate64.rom mega65.rom
 	cp build/chargen.rom bin/chargen.rom
 
 # Rules - tools
@@ -113,6 +114,10 @@ build/chargen.rom: $(TOOL_PNGPREPARE) assets/8x8font.png
 
 # Dependencies - BASIC and KERNAL
 
+build/target_custom/OUTB.BIN      build/target_custom/BASIC_combined.vs: \
+    $(TOOL_ASSEMBLER) $(TOOL_BUILD_SEGMENT) $(GEN_BASIC) $(SRCDIR_BASIC) \
+    c64/,,config_custom.s         build/target_custom/KERNAL_combined.sym \
+    $(foreach dir,$(SRCDIR_BASIC),$(wildcard $(dir)/*.s))
 build/target_generic/OUTB.BIN     build/target_generic/BASIC_combined.vs: \
     $(TOOL_ASSEMBLER) $(TOOL_BUILD_SEGMENT) $(GEN_BASIC) $(SRCDIR_BASIC) \
     c64/,,config_generic.s     build/target_generic/KERNAL_combined.sym \
@@ -130,6 +135,10 @@ build/target_ultimate64/OUTB.BIN  build/target_ultimate64/BASIC_combined.vs: \
     c64/,,config_ultimate64.s  build/target_ultimate64/KERNAL_combined.sym \
     $(foreach dir,$(SRCDIR_BASIC),$(wildcard $(dir)/*.s))
 
+build/target_custom/OUTK.BIN      build/target_custom/KERNAL_combined.vs      build/target_custom/KERNAL_combined.sym: \
+    $(TOOL_ASSEMBLER) $(TOOL_BUILD_SEGMENT) $(GEN_KERNAL) $(SRCDIR_KERNAL) \
+    c64/,,config_custom.s \
+    $(foreach dir,$(SRCDIR_KERNAL),$(wildcard $(dir)/*.s))
 build/target_generic/OUTK.BIN     build/target_generic/KERNAL_combined.vs     build/target_generic/KERNAL_combined.sym: \
     $(TOOL_ASSEMBLER) $(TOOL_BUILD_SEGMENT) $(GEN_KERNAL) $(SRCDIR_KERNAL) \
     c64/,,config_generic.s \
@@ -147,21 +156,25 @@ build/target_ultimate64/OUTK.BIN  build/target_ultimate64/KERNAL_combined.vs  bu
     c64/,,config_ultimate64.s \
     $(foreach dir,$(SRCDIR_KERNAL),$(wildcard $(dir)/*.s))
 
+build/target_custom/newrom:       build/target_custom/OUTB.BIN      build/target_custom/OUTK.BIN
 build/target_generic/newrom:      build/target_generic/OUTB.BIN     build/target_generic/OUTK.BIN
 build/target_testing/newrom:      build/target_testing/OUTB.BIN     build/target_testing/OUTK.BIN
 build/target_mega65/newrom:       build/target_mega65/OUTB.BIN      build/target_mega65/OUTK.BIN
 build/target_ultimate64/newrom:   build/target_ultimate64/OUTB.BIN  build/target_ultimate64/OUTK.BIN
 
+build/kernal_custom.rom:          build/target_custom/newrom
 build/kernal_generic.rom:         build/target_generic/newrom
 build/kernal_testing.rom:         build/target_testing/newrom
 build/kernal_mega65.rom:          build/target_mega65/newrom
 build/kernal_ultimate64.rom:      build/target_ultimate64/newrom
 
+build/basic_custom.rom:           build/target_custom/newrom
 build/basic_generic.rom:          build/target_generic/newrom
 build/basic_testing.rom:          build/target_testing/newrom
 build/basic_mega65.rom:           build/target_mega65/newrom
 build/basic_ultimate64.rom:       build/target_ultimate64/newrom
 
+build/symbols_custom.vs:          build/target_custom/BASIC_combined.vs      build/target_custom/KERNAL_combined.vs
 build/symbols_generic.vs:         build/target_generic/BASIC_combined.vs     build/target_generic/KERNAL_combined.vs
 build/symbols_testing.vs:         build/target_testing/BASIC_combined.vs     build/target_testing/KERNAL_combined.vs
 build/symbols_mega65.vs:          build/target_mega65/BASIC_combined.vs      build/target_mega65/KERNAL_combined.vs
@@ -215,11 +228,11 @@ build/symbols_hybrid.vs: build/target_generic/KERNAL_combined.vs
 
 # Rules - platform 'Mega 65' specific
 
-build/newc65.rom: build/kernal_mega65.rom build/basic_mega65.rom build/chargen.rom
-	dd if=/dev/zero bs=4096 count=10 of=build/newc65.rom
-	cat build/basic_mega65.rom build/chargen.rom build/chargen.rom build/kernal_mega65.rom >> build/newc65.rom
+build/mega65.rom: build/kernal_mega65.rom build/basic_mega65.rom build/chargen.rom
+	dd if=/dev/zero bs=4096 count=10 of=build/mega65.rom
+	cat build/basic_mega65.rom build/chargen.rom build/chargen.rom build/kernal_mega65.rom >> build/mega65.rom
 	dd if=/dev/zero bs=65536 count=1 of=build/padding
-	cat build/padding >> build/newc65.rom
+	cat build/padding >> build/mega65.rom
 	rm -f build/padding
 
 # Rules - tests
@@ -229,7 +242,10 @@ build/newc65.rom: build/kernal_mega65.rom build/basic_mega65.rom build/chargen.r
         test_ultimate64 \
         testremote testsimilarity
 
-test: test_generic
+test: test_custom
+
+test_custom: build/kernal_custom.rom build/basic_custom.rom build/symbols_custom.vs
+	x64 -kernal build/kernal_custom.rom -basic build/basic_custom.rom -moncommands build/symbols_custom.vs -1 $(TESTTAPE) -8 $(TESTDISK)
 
 test_generic: build/kernal_generic.rom build/basic_generic.rom build/symbols_generic.vs
 	x64 -kernal build/kernal_generic.rom -basic build/basic_generic.rom -moncommands build/symbols_generic.vs -1 $(TESTTAPE) -8 $(TESTDISK)
@@ -240,11 +256,11 @@ test_generic_x128: build/kernal_generic.rom build/basic_generic.rom build/symbol
 test_testing: build/kernal_testing.rom build/basic_testing.rom build/symbols_testing.vs
 	x64 -kernal build/kernal_testing.rom -basic build/basic_testing.rom -moncommands build/symbols_testing.vs -1 $(TESTTAPE) -8 $(TESTDISK)
 
-test_mega65: build/kernal_mega65.rom build/basic_mega65.rom build/symbols_mega65.vs
+test_mega65_vice: build/kernal_mega65.rom build/basic_mega65.rom build/symbols_mega65.vs
 	x64 -kernal build/kernal_mega65.rom -basic build/basic_mega65.rom -moncommands build/symbols_mega65.vs -1 $(TESTTAPE) -8 $(TESTDISK)
 
-test_mega65_xemu: build/newc65.rom
-	../xemu/build/bin/xmega65.native -dmarev 2 -forcerom -loadrom build/newc65.rom
+test_mega65: build/mega65.rom
+	../xemu/build/bin/xmega65.native -dmarev 2 -forcerom -loadrom build/mega65.rom
 
 test_ultimate64: build/kernal_ultimate64.rom build/basic_ultimate64.rom build/symbols_ultimate64.vs
 	x64 -kernal build/kernal_ultimate64.rom -basic build/basic_ultimate64.rom -moncommands build/symbols_ultimate64.vs -1 $(TESTTAPE) -8 $(TESTDISK)
@@ -258,11 +274,11 @@ test_hybrid: build/kernal_hybrid.rom build/symbols_hybrid.vs
 	@echo $(HYBRID_WARNING)
 	@echo
 
-test_m65: build/newc65.rom
-	m65 -b ../mega65-core/bin/mega65r1.bit -k ../mega65-core/bin/KICKUP.M65 -R build/newc65.rom -4
+test_m65: build/mega65.rom
+	m65 -b ../mega65-core/bin/mega65r1.bit -k ../mega65-core/bin/KICKUP.M65 -R build/mega65.rom -4
 
-testremote: build/kernal_generic.rom build/basic_generic.rom build/symbols_generic.vs
-	x64 -kernal build/kernal_generic.rom -basic build/basic_generic.rom -moncommands build/symbols_generic.vs -remotemonitor
+testremote: build/kernal_custom.rom build/basic_custom.rom build/symbols_custom.vs
+	x64 -kernal build/kernal_custom.rom -basic build/basic_custom.rom -moncommands build/symbols_custom.vs -remotemonitor
 
 testsimilarity: build/target_generic/newrom $(TOOL_SIMILARITY) kernal basic
 	$(TOOL_SIMILARITY) kernal build/target_generic/newrom
diff --git a/bin/basic_generic.rom b/bin/basic_generic.rom
index 3dd8d88d..e5b98544 100644
Binary files a/bin/basic_generic.rom and b/bin/basic_generic.rom differ
diff --git a/bin/basic_mega65.rom b/bin/basic_mega65.rom
deleted file mode 100644
index a80f886a..00000000
Binary files a/bin/basic_mega65.rom and /dev/null differ
diff --git a/bin/basic_testing.rom b/bin/basic_testing.rom
index 8ed46786..0f7c76c6 100644
Binary files a/bin/basic_testing.rom and b/bin/basic_testing.rom differ
diff --git a/bin/basic_ultimate64.rom b/bin/basic_ultimate64.rom
index 0a15cf21..55d8b492 100644
Binary files a/bin/basic_ultimate64.rom and b/bin/basic_ultimate64.rom differ
diff --git a/bin/kernal_generic.rom b/bin/kernal_generic.rom
index af43bd23..06c23b71 100644
Binary files a/bin/kernal_generic.rom and b/bin/kernal_generic.rom differ
diff --git a/bin/kernal_mega65.rom b/bin/kernal_mega65.rom
deleted file mode 100644
index 6f2f40a2..00000000
Binary files a/bin/kernal_mega65.rom and /dev/null differ
diff --git a/bin/kernal_testing.rom b/bin/kernal_testing.rom
index d0b82a3c..b34d40ec 100644
Binary files a/bin/kernal_testing.rom and b/bin/kernal_testing.rom differ
diff --git a/bin/kernal_ultimate64.rom b/bin/kernal_ultimate64.rom
index 79bef138..c1d6bd4f 100644
Binary files a/bin/kernal_ultimate64.rom and b/bin/kernal_ultimate64.rom differ
diff --git a/bin/newc65.rom b/bin/mega65.rom
similarity index 86%
rename from bin/newc65.rom
rename to bin/mega65.rom
index 2da93019..aad0e85b 100644
Binary files a/bin/newc65.rom and b/bin/mega65.rom differ
diff --git a/c64/,,config_custom.s b/c64/,,config_custom.s
new file mode 100644
index 00000000..b3e0bc11
--- /dev/null
+++ b/c64/,,config_custom.s
@@ -0,0 +1,133 @@
+
+.const CONFIG_ID = $00 // should be 1 byte, different for each config file!
+.encoding "petscii_upper"
+
+//
+// Please read CONFIG.md before modifying this file!
+//
+
+// Idea:
+// - configuration for custom builds and for development
+// - file contains options to enable unfinished functionalities
+
+
+// Hardware platform and brand
+
+#define CONFIG_PLATFORM_COMMODORE_64
+
+// #define CONFIG_MB_MEGA_65
+// #define CONFIG_MB_ULTIMATE_64
+
+#define CONFIG_BRAND_CUSTOM_BUILD
+// #define CONFIG_BRAND_GENERIC
+// #define CONFIG_BRAND_TESTING
+// #define CONFIG_BRAND_MEGA_65
+// #define CONFIG_BRAND_ULTIMATE_64
+
+.const CONFIG_CUSTOM_BRAND = @"CUSTOM BUILD"
+
+
+// Processor instruction set
+
+#define CONFIG_CPU_MOS_6502
+// #define CONFIG_CPU_WDC_65C02
+// #define CONFIG_CPU_CSG_65CE02
+// #define CONFIG_CPU_WDC_65816
+
+
+// Memory model
+
+#define CONFIG_MEMORY_MODEL_38K
+// #define CONFIG_MEMORY_MODEL_60K
+
+
+// I/O devices
+
+#define CONFIG_IEC
+#define CONFIG_IEC_BLANK_SCREEN
+// #define CONFIG_IEC_DOLPHINDOS  // please keep disabled for now  
+#define CONFIG_IEC_JIFFYDOS
+
+#define CONFIG_TAPE_NORMAL        // not finished yet!
+#define CONFIG_TAPE_TURBO
+
+// #define CONFIG_RS232_UP2400    // please keep disabled for now
+// #define CONFIG_RS232_UP9600    // please keep disabled for now
+
+
+// Multiple SID support
+
+// #define CONFIG_SID_2ND
+.const CONFIG_SID_2ND_ADDRESS = $D420
+
+// #define CONFIG_SID_3RD 
+.const CONFIG_SID_3RD_ADDRESS = $D440
+
+// #define CONFIG_SID_D4XX
+// #define CONFIG_SID_D5XX
+
+
+// Keyboard settings
+
+// #define CONFIG_LEGACY_SCNKEY
+// #define CONFIG_KEYBOARD_C128
+// #define CONFIG_KEYBOARD_C128_CAPS_LOCK
+// #define CONFIG_KEYBOARD_C65              // untested
+// #define CONFIG_KEYBOARD_C65_CAPS_LOCK    // untested
+// #define CONFIG_KEY_REPEAT_DEFAULT
+// #define CONFIG_KEY_REPEAT_ALWAYS
+#define CONFIG_KEY_FAST_SCAN
+#define CONFIG_JOY1_CURSOR
+#define CONFIG_JOY2_CURSOR
+
+#define CONFIG_PROGRAMMABLE_KEYS
+
+.const CONFIG_KEYCMD_RUN  = @"\$5FL"
+
+.const CONFIG_KEYCMD_F1   = @"@"
+.const CONFIG_KEYCMD_F2   = @""
+.const CONFIG_KEYCMD_F3   = @"RUN:"
+.const CONFIG_KEYCMD_F4   = @""
+.const CONFIG_KEYCMD_F5   = @"LOAD"
+.const CONFIG_KEYCMD_F6   = @""
+.const CONFIG_KEYCMD_F7   = @"@$"
+.const CONFIG_KEYCMD_F8   = @""
+
+.const CONFIG_KEYCMD_HELP = @"LIST"
+
+.const CONFIG_KEYCMD_F9   = @""
+.const CONFIG_KEYCMD_F10  = @""
+.const CONFIG_KEYCMD_F11  = @""
+.const CONFIG_KEYCMD_F12  = @""
+.const CONFIG_KEYCMD_F13  = @""
+.const CONFIG_KEYCMD_F14  = @""
+
+
+// Screen editor
+
+#define CONFIG_EDIT_STOPQUOTE
+#define CONFIG_EDIT_TABULATORS
+
+
+// Software features
+
+#define CONFIG_PANIC_SCREEN
+#define CONFIG_DOS_WEDGE
+#define CONFIG_TAPE_WEDGE
+#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_FEATURES
+#define CONFIG_SHOW_PAL_NTSC
+
+
+// Debug options
+
+// #define CONFIG_DBG_STUBS_BRK
+// #define CONFIG_DBG_PRINTF
diff --git a/c64/,,config_generic.s b/c64/,,config_generic.s
index 14803a88..de3116f0 100644
--- a/c64/,,config_generic.s
+++ b/c64/,,config_generic.s
@@ -1,5 +1,5 @@
 
-.const CONFIG_ID = $00 // should be 1 byte, different for each config file!
+.const CONFIG_ID = $01 // should be 1 byte, different for each config file!
 .encoding "petscii_upper"
 
 //
@@ -42,15 +42,10 @@
 
 #define CONFIG_IEC
 #define CONFIG_IEC_BLANK_SCREEN
-// #define CONFIG_IEC_DOLPHINDOS  // please keep disabled for now  
 #define CONFIG_IEC_JIFFYDOS
 
-#define CONFIG_TAPE_NORMAL        // not finished yet!
 #define CONFIG_TAPE_TURBO
 
-// #define CONFIG_RS232_UP2400    // please keep disabled for now
-// #define CONFIG_RS232_UP9600    // please keep disabled for now
-
 
 // Multiple SID support
 
diff --git a/c64/,,config_mega65.s b/c64/,,config_mega65.s
index 0c04da31..9d1e9de7 100644
--- a/c64/,,config_mega65.s
+++ b/c64/,,config_mega65.s
@@ -1,5 +1,5 @@
 
-.const CONFIG_ID = $01 // should be 1 byte, different for each config file!
+.const CONFIG_ID = $02 // should be 1 byte, different for each config file!
 .encoding "petscii_upper"
 
 //
@@ -9,8 +9,6 @@
 // Idea:
 // - sane defaults for the Mega 65 FPGA computer
 // - do not enable features which are a significant compatibility risk
-// - unless VICE gains Commodore 65 (or at least Flash8 cartridge) emulation support,
-//   do not enable CPU-specific optimizations; ROMs would be hard to test
 
 
 // Hardware platform and brand
@@ -28,9 +26,9 @@
 
 // Processor instruction set
 
-#define CONFIG_CPU_MOS_6502
+// #define CONFIG_CPU_MOS_6502
 // #define CONFIG_CPU_WDC_65C02
-// #define CONFIG_CPU_CSG_65CE02
+#define CONFIG_CPU_CSG_65CE02
 // #define CONFIG_CPU_WDC_65816
 
 
@@ -44,15 +42,10 @@
 
 #define CONFIG_IEC
 #define CONFIG_IEC_BLANK_SCREEN
-// #define CONFIG_IEC_DOLPHINDOS  // please keep disabled for now  
 #define CONFIG_IEC_JIFFYDOS
 
-// #define CONFIG_TAPE_NORMAL     // please keep disabled for now
 // #define CONFIG_TAPE_TURBO
 
-// #define CONFIG_RS232_UP2400    // please keep disabled for now
-// #define CONFIG_RS232_UP9600    // please keep disabled for now
-
 
 // Multiple SID support
 
diff --git a/c64/,,config_ultimate64.s b/c64/,,config_ultimate64.s
index 1ba117be..08741cab 100644
--- a/c64/,,config_ultimate64.s
+++ b/c64/,,config_ultimate64.s
@@ -1,5 +1,5 @@
 
-.const CONFIG_ID = $02 // should be 1 byte, different for each config file!
+.const CONFIG_ID = $03 // should be 1 byte, different for each config file!
 .encoding "petscii_upper"
 
 //
@@ -42,14 +42,10 @@
 
 #define CONFIG_IEC
 #define CONFIG_IEC_BLANK_SCREEN
-// #define CONFIG_IEC_DOLPHINDOS  // please keep disabled for now  
 #define CONFIG_IEC_JIFFYDOS
 
-// #define CONFIG_TAPE_NORMAL     // please keep disabled for now
 #define CONFIG_TAPE_TURBO
 
-// #define CONFIG_RS232_UP2400    // please keep disabled for now
-// #define CONFIG_RS232_UP9600    // please keep disabled for now
 
 
 // Multiple SID support
diff --git a/c64/aliases/,aliases_config.s b/c64/aliases/,aliases_config.s
index f0b303ae..7ed7990a 100644
--- a/c64/aliases/,aliases_config.s
+++ b/c64/aliases/,aliases_config.s
@@ -47,6 +47,9 @@
 {
 	.var selected = 0;
 
+#if CONFIG_BRAND_CUSTOM_BUILD
+	.eval selected++
+#endif
 #if CONFIG_BRAND_GENERIC
 	.eval selected++
 #endif
@@ -62,11 +65,11 @@
 
 	.if (selected != 1) .error "Please select exactly one CONFIG_BRAND_* option"
 
-#if CONFIG_MB_MEGA_65 && !(CONFIG_BRAND_MEGA_65 || CONFIG_BRAND_TESTING)
-	.error "Please select brand either matching the CONFIG_MB_*, or a testing one"
+#if CONFIG_MB_MEGA_65 && !(CONFIG_BRAND_MEGA_65 || CONFIG_BRAND_TESTING || CONFIG_BRAND_CUSTOM_BUILD)
+	.error "Please select brand either matching the CONFIG_MB_*, or a testing/custom one"
 #endif
-#if CONFIG_MB_ULTIMATE_64 && !(CONFIG_BRAND_ULTIMATE_64 || CONFIG_BRAND_TESTING)
-	.error "Please select brand either matching the CONFIG_MB_*, or a testing one"
+#if CONFIG_MB_ULTIMATE_64 && !(CONFIG_BRAND_ULTIMATE_64 || CONFIG_BRAND_TESTING || CONFIG_BRAND_CUSTOM_BUILD)
+	.error "Please select brand either matching the CONFIG_MB_*, or a testing/custom one"
 #endif
 }
 
diff --git a/c64/basic/init/initmsg_real.s b/c64/basic/init/initmsg_real.s
index e919ae04..923b74a6 100644
--- a/c64/basic/init/initmsg_real.s
+++ b/c64/basic/init/initmsg_real.s
@@ -10,6 +10,8 @@ initmsg_real:
 	ldy #>startup_banner
 	jsr STROUT
 
+#if !CONFIG_BRAND_CUSTOM_BUILD
+
 	ldx #$01
 	ldy #$04
 	jsr plot_set
@@ -18,13 +20,23 @@ initmsg_real:
 	ldy #>rom_revision_basic_string
 	jsr STROUT
 
+#endif // no CONFIG_BRAND_CUSTOM_BUILD
+
+#if !CONFIG_BRAND_CUSTOM_BUILD
 	ldx #$03
+#else
+	ldx #$02
+#endif
 	ldy #$04
 	jsr plot_set
 
 	jsr initmsg_bytes_free
 
+#if !CONFIG_BRAND_CUSTOM_BUILD
 	ldx #$06
+#else
+	ldx #$05
+#endif
 	ldy #$00
 #if CONFIG_SHOW_PAL_NTSC && CONFIG_SHOW_FEATURES
 	jsr plot_set
@@ -54,6 +66,8 @@ initmsg_real:
 	ldy #>startup_banner
 	jsr STROUT
 
+#if !CONFIG_BRAND_CUSTOM_BUILD
+
 	ldx #$01
 	ldy #$0A
 	jsr plot_set
@@ -66,13 +80,23 @@ initmsg_real:
 	ldy #>rom_revision_basic_string
 	jsr STROUT
 
+#endif // no CONFIG_BRAND_CUSTOM_BUILD
+
+#if !CONFIG_BRAND_CUSTOM_BUILD
 	ldx #$03
+#else
+	ldx #$02
+#endif
 	ldy #$0A
 	jsr plot_set
 
 	jsr initmsg_bytes_free
 
+#if !CONFIG_BRAND_CUSTOM_BUILD
 	ldx #$06
+#else
+	ldx #$05
+#endif
 	ldy #$00
 #if CONFIG_SHOW_PAL_NTSC && CONFIG_SHOW_FEATURES
 	jsr plot_set
diff --git a/c64/basic/init/startup_banner.s b/c64/basic/init/startup_banner.s
index 8736df64..7543ef0a 100644
--- a/c64/basic/init/startup_banner.s
+++ b/c64/basic/init/startup_banner.s
@@ -8,7 +8,10 @@
 
 .macro BANNER_TEXT() {
 
-#if CONFIG_BRAND_GENERIC
+#if CONFIG_BRAND_CUSTOM_BUILD
+	.text "OPEN ROMS "
+	.text CONFIG_CUSTOM_BRAND
+#elif CONFIG_BRAND_GENERIC
 	.text "OPEN ROMS GENERIC BUILD"
 #elif CONFIG_BRAND_TESTING
 	.text "OPEN ROMS TESTING BUILD"
@@ -61,11 +64,15 @@ rainbow_logo:
     .byte SET_COLOR_0, $00
 }
 
+#if !CONFIG_BRAND_CUSTOM_BUILD
+
 pre_revision_string:
 
 	.text "RELEASE "
 	.byte $00
 
+#endif // no CONFIG_BRAND_CUSTOM_BUILD
+
 #elif CONFIG_BANNER_BRAND && CONFIG_BRAND_MEGA_65
 
 	// Fancy Mega65 banner - from Retrofan
diff --git a/c64/basic/rom_revision/bf52.rom_revision_basic.s b/c64/basic/rom_revision/bf52.rom_revision_basic.s
index 30c9e65d..8fe574c8 100644
--- a/c64/basic/rom_revision/bf52.rom_revision_basic.s
+++ b/c64/basic/rom_revision/bf52.rom_revision_basic.s
@@ -21,7 +21,12 @@ rom_revision_basic_string:
 
 	// $BF55
 
+#if !CONFIG_BRAND_CUSTOM_BUILD
 	.text "(DEVEL SNAPSHOT)"  // actual ROM revision string; up to 16 characters
+#else
+	.text "(CUSTOM BUILD)"
+#endif
+
 	.byte $00                 // marks the end of string
 
 __rom_revision_basic_end:
diff --git a/c64/basic/rom_revision/e4b7.rom_revision_kernal.s b/c64/basic/rom_revision/e4b7.rom_revision_kernal.s
index 996baeec..e98bb1a8 100644
--- a/c64/basic/rom_revision/e4b7.rom_revision_kernal.s
+++ b/c64/basic/rom_revision/e4b7.rom_revision_kernal.s
@@ -35,7 +35,12 @@ rom_revision_kernal_string:
 
 	// $E4BC
 
+#if !CONFIG_BRAND_CUSTOM_BUILD
 	.text "(DEVEL SNAPSHOT)"  // actual ROM revision string; up to 16 characters
+#else
+	.text "(CUSTOM BUILD)"
+#endif
+
 	.byte $00                 // marks the end of string
 
 __rom_revision_kernal_end: