diff --git a/Makefile b/Makefile
index 0dacf6a7..e69e5731 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ SRC_KERNAL_ULTIMATE64 = $(SRC_KERNAL_COMMON) $(wildcard c64/kernal/,platform_ult
 
 # Rules - maintainance
 
-all: build/chargen build/newkern_generic build/newbasic_generic build/newkern_mega65 build/newbasic_mega65 build/newkern_ultimate64 build/newbasic_ultimate64
+all: build/chargen build/newkern_generic build/newbasic_generic build/newc65 build/newkern_ultimate64 build/newbasic_ultimate64
 
 clean:
 	@rm -rf build
diff --git a/bin/REEADME.txt b/bin/REEADME.txt
new file mode 100644
index 00000000..d3a254bc
--- /dev/null
+++ b/bin/REEADME.txt
@@ -0,0 +1,14 @@
+
+Follow these rules, or bad things will happen!
+
+
+- Don't mix ROMs for different platforms - use generic BASIC with generic KERNAL, Mega65 BASIC with Mega65 KERNAL, etc.
+
+- Don't mix these ROMs with any other ROMs; the only exception is CHARGEN, this one is fully interchangeable.
+
+- Don't mix ROMs from different builds/versions (again, CHARGEN is an exception).
+
+- The generic ROM set should be compatible with any C64-compatible machine; platform-specific ROMs might not work on other platforms.
+
+
+Have fun!
diff --git a/bin/basic b/bin/basic_generic.rom
similarity index 100%
rename from bin/basic
rename to bin/basic_generic.rom
diff --git a/bin/basic_mega65.rom b/bin/basic_mega65.rom
new file mode 100644
index 00000000..ccea4daf
Binary files /dev/null and b/bin/basic_mega65.rom differ
diff --git a/bin/basic_ultimate64.rom b/bin/basic_ultimate64.rom
new file mode 100644
index 00000000..034b50d0
Binary files /dev/null and b/bin/basic_ultimate64.rom differ
diff --git a/bin/chargen b/bin/chargen.rom
similarity index 100%
rename from bin/chargen
rename to bin/chargen.rom
diff --git a/bin/kernal b/bin/kernal_generic.rom
similarity index 99%
rename from bin/kernal
rename to bin/kernal_generic.rom
index b169ad25..52d24cdc 100644
Binary files a/bin/kernal and b/bin/kernal_generic.rom differ
diff --git a/bin/kernal_mega65.rom b/bin/kernal_mega65.rom
new file mode 100644
index 00000000..52d24cdc
Binary files /dev/null and b/bin/kernal_mega65.rom differ
diff --git a/bin/kernal_ultimate64.rom b/bin/kernal_ultimate64.rom
new file mode 100644
index 00000000..52d24cdc
Binary files /dev/null and b/bin/kernal_ultimate64.rom differ
diff --git a/c64/basic/,platform_generic/,hooks_generic.s b/c64/basic/,platform_generic/,hooks_generic.s
new file mode 100644
index 00000000..4f743e84
--- /dev/null
+++ b/c64/basic/,platform_generic/,hooks_generic.s
@@ -0,0 +1,9 @@
+
+;; Platform-specific hooks
+
+
+.macro PLATFORM_HOOK_BANNER
+
+	.byte $05, "  OPEN ROMS, ", $00
+
+.macend
diff --git a/c64/basic/,platform_generic/.dummy b/c64/basic/,platform_generic/.dummy
deleted file mode 100644
index e69de29b..00000000
diff --git a/c64/basic/,platform_mega65/,hooks_mega65.s b/c64/basic/,platform_mega65/,hooks_mega65.s
new file mode 100644
index 00000000..d8eecbaf
--- /dev/null
+++ b/c64/basic/,platform_mega65/,hooks_mega65.s
@@ -0,0 +1,41 @@
+
+;; Platform-specific hooks
+
+
+.macro PLATFORM_HOOK_BANNER
+
+	;; New banner from Retrofan
+	.byte $9a, $12, $20, $20, $7f, $a9, $20, $20, $1f, $20, $9a, $20, $20, $20
+	.byte $20, $1f, $20, $9a, $a9, $20, $20, $20, $92, $a1, $1f, $12, $20, $9a, $a9, $20
+	.byte $20, $20, $7f, $1f, $20, $20, $9a, $a3, $a3, $a3, $a3, $a3, $a3, $a3, $1f, $20
+	.byte $20, $20, $20, $05, $92, $4d, $45, $47, $41, $9a, $12, $20, $20, $20, $20, $20
+	.byte $20, $1f, $20, $9a, $20, $20, $92, $a2, $bb, $1f, $12, $20, $9a, $20, $20, $92
+	.byte $ac, $a2, $a2, $1f, $12, $20, $9a, $20, $20, $1f, $20, $9a, $20, $20, $1f, $20
+	.byte $20, $1e, $a3, $a3, $a3, $a3, $a3, $a3, $1f, $20, $20, $20, $20, $05, $92, $42
+	.byte $41, $53, $49, $43, $9a, $12, $20, $20, $92, $7f, $a9, $12, $20, $20, $1f, $20
+	.byte $9a, $20, $20, $a2, $92, $be, $1f, $12, $20, $9a, $20, $20, $92, $bc, $12, $20
+	.byte $20, $1f, $20, $9a, $20, $20, $20, $20, $20, $1f, $20, $20, $9e, $a3, $a3, $a3
+	.byte $a3, $a3, $1f, $20, $20, $20, $20, $05, $92, $2d, $2d, $2d, $2d, $2d, $2d, $9a
+	.byte $12, $20, $20, $1f, $20, $20, $9a, $20, $20, $1f, $20, $9a, $20, $20, $20, $20
+	.byte $1f, $20, $9a, $20, $20, $20, $20, $20, $1f, $20, $9a, $20, $20, $1f, $20, $9a
+	.byte $20, $20, $1f, $20, $20, $96, $a3, $a3, $a3, $a3, $1f
+	.byte $92, $0D, $0D, $05, $00
+
+	;; Original Deft-supplied banner
+	;; .byte $9A,$12,$A3,$A3,$A3,$A3,$A3,$A3,$DF,$9B,$92,$20,$05,$12,$A0,$A0
+	;; .byte $DF,$9B,$92,$20,$05,$12,$A0,$A0,$DF,$9B,$92,$20,$05,$12,$A0,$A0
+	;; .byte $DF,$9B,$92,$20,$05,$12,$A0,$A0,$DF,$9A,$92,$20,$05,$20,$20,$20
+	;; .byte $4D,$20,$45,$20,$47,$20,$41,$0D,$99,$12,$A3,$A3,$A3,$A3,$A3,$A3
+	;; .byte $A3,$DF,$92,$7F,$12,$CD,$CD,$DF,$92,$7F,$12,$DF,$05,$92,$20,$20
+	;; .byte $99,$7F,$12,$DF,$05,$92,$20,$20,$99,$7F,$12,$DF,$92,$7F,$12,$DF
+	;; .byte $05,$92,$20,$20,$99,$42,$20,$41,$20,$53,$20,$49,$20,$43,$0D,$9E
+	;; .byte $12,$A3,$A3,$A3,$A3,$A3,$A3,$A3,$A3,$DF,$9B,$92,$7F,$12,$DF,$92
+	;; .byte $7F,$12,$DF,$92,$7F,$12,$CD,$05,$92,$20,$20,$9B,$7F,$12,$CD,$92
+	;; .byte $7F,$12,$DF,$92,$7F,$12,$CD,$92,$7F,$12,$DF,$9A,$92,$20,$05,$20
+	;; .byte $9A,$2D,$2D,$2D,$2D,$2D,$2D,$2D,$0D,$96,$12,$A3,$A3,$A3,$A3,$A3
+	;; .byte $A3,$A3,$A3,$A3,$DF,$9A,$92,$7F,$12,$DF,$92,$7F,$9B,$20,$9A,$7F
+	;; .byte $12,$A0,$A0,$9B,$92,$20,$9A,$7F,$12,$A0,$A0,$9B,$92,$20,$9A,$7F
+	;; .byte $12,$DF,$92,$7F,$9B,$20,$9A,$20,$9B,"0.2.0.0",$0D
+	;; .byte $0D,$05,$92,$00
+
+.macend
diff --git a/c64/basic/,platform_mega65/.dummy b/c64/basic/,platform_mega65/.dummy
deleted file mode 100644
index e69de29b..00000000
diff --git a/c64/basic/,platform_ultimate64/,hooks_ultimate64.s b/c64/basic/,platform_ultimate64/,hooks_ultimate64.s
new file mode 100644
index 00000000..717d70bc
--- /dev/null
+++ b/c64/basic/,platform_ultimate64/,hooks_ultimate64.s
@@ -0,0 +1,9 @@
+
+;; Platform-specific hooks
+
+
+.macro PLATFORM_HOOK_BANNER
+
+	.byte $05, "  OPEN ROMS FOR ULTIMATE 64", $0D, $0D, "  ", $00
+
+.macend
diff --git a/c64/basic/basic_cold_start.s b/c64/basic/basic_cold_start.s
index 6e231458..de4faf76 100644
--- a/c64/basic/basic_cold_start.s
+++ b/c64/basic/basic_cold_start.s
@@ -15,42 +15,7 @@ basic_cold_start:
 ; Used 217 bytes
 startup_banner:
 
-	;; Simple banner
-	.byte $05, "  OPEN ROMS, ", $00
-
-	;; New banner from Retrofan
-	;; .byte $9a, $12, $20, $20, $7f, $a9, $20, $20, $1f, $20, $9a, $20, $20, $20
-	;; .byte $20, $1f, $20, $9a, $a9, $20, $20, $20, $92, $a1, $1f, $12, $20, $9a, $a9, $20
-	;; .byte $20, $20, $7f, $1f, $20, $20, $9a, $a3, $a3, $a3, $a3, $a3, $a3, $a3, $1f, $20
-	;; .byte $20, $20, $20, $05, $92, $4d, $45, $47, $41, $9a, $12, $20, $20, $20, $20, $20
-	;; .byte $20, $1f, $20, $9a, $20, $20, $92, $a2, $bb, $1f, $12, $20, $9a, $20, $20, $92
-	;; .byte $ac, $a2, $a2, $1f, $12, $20, $9a, $20, $20, $1f, $20, $9a, $20, $20, $1f, $20
-	;; .byte $20, $1e, $a3, $a3, $a3, $a3, $a3, $a3, $1f, $20, $20, $20, $20, $05, $92, $42
-	;; .byte $41, $53, $49, $43, $9a, $12, $20, $20, $92, $7f, $a9, $12, $20, $20, $1f, $20
-	;; .byte $9a, $20, $20, $a2, $92, $be, $1f, $12, $20, $9a, $20, $20, $92, $bc, $12, $20
-	;; .byte $20, $1f, $20, $9a, $20, $20, $20, $20, $20, $1f, $20, $20, $9e, $a3, $a3, $a3
-	;; .byte $a3, $a3, $1f, $20, $20, $20, $20, $05, $92, $2d, $2d, $2d, $2d, $2d, $2d, $9a
-	;; .byte $12, $20, $20, $1f, $20, $20, $9a, $20, $20, $1f, $20, $9a, $20, $20, $20, $20
-	;; .byte $1f, $20, $9a, $20, $20, $20, $20, $20, $1f, $20, $9a, $20, $20, $1f, $20, $9a
-	;; .byte $20, $20, $1f, $20, $20, $96, $a3, $a3, $a3, $a3, $1f
-	;; .byte $92, $0D, $0D, $05, $00
-
-	;; Original Deft-supplied banner
-	;; .byte $9A,$12,$A3,$A3,$A3,$A3,$A3,$A3,$DF,$9B,$92,$20,$05,$12,$A0,$A0
-	;; .byte $DF,$9B,$92,$20,$05,$12,$A0,$A0,$DF,$9B,$92,$20,$05,$12,$A0,$A0
-	;; .byte $DF,$9B,$92,$20,$05,$12,$A0,$A0,$DF,$9A,$92,$20,$05,$20,$20,$20
-	;; .byte $4D,$20,$45,$20,$47,$20,$41,$0D,$99,$12,$A3,$A3,$A3,$A3,$A3,$A3
-	;; .byte $A3,$DF,$92,$7F,$12,$CD,$CD,$DF,$92,$7F,$12,$DF,$05,$92,$20,$20
-	;; .byte $99,$7F,$12,$DF,$05,$92,$20,$20,$99,$7F,$12,$DF,$92,$7F,$12,$DF
-	;; .byte $05,$92,$20,$20,$99,$42,$20,$41,$20,$53,$20,$49,$20,$43,$0D,$9E
-	;; .byte $12,$A3,$A3,$A3,$A3,$A3,$A3,$A3,$A3,$DF,$9B,$92,$7F,$12,$DF,$92
-	;; .byte $7F,$12,$DF,$92,$7F,$12,$CD,$05,$92,$20,$20,$9B,$7F,$12,$CD,$92
-	;; .byte $7F,$12,$DF,$92,$7F,$12,$CD,$92,$7F,$12,$DF,$9A,$92,$20,$05,$20
-	;; .byte $9A,$2D,$2D,$2D,$2D,$2D,$2D,$2D,$0D,$96,$12,$A3,$A3,$A3,$A3,$A3
-	;; .byte $A3,$A3,$A3,$A3,$DF,$9A,$92,$7F,$12,$DF,$92,$7F,$9B,$20,$9A,$7F
-	;; .byte $12,$A0,$A0,$9B,$92,$20,$9A,$7F,$12,$A0,$A0,$9B,$92,$20,$9A,$7F
-	;; .byte $12,$DF,$92,$7F,$9B,$20,$9A,$20,$9B,"0.2.0.0",$0D
-	;; .byte $0D,$05,$92,$00
+	`PLATFORM_HOOK_BANNER
 
 	;; Work out free bytes, and display
 	jsr basic_do_new
diff --git a/c64/kernal/,platform_ultimate64/,aliases-ultimate64.s b/c64/kernal/,platform_ultimate64/,aliases-ultimate64.s
deleted file mode 100644
index 1f30e332..00000000
--- a/c64/kernal/,platform_ultimate64/,aliases-ultimate64.s
+++ /dev/null
@@ -1,10 +0,0 @@
-
-;; Registers according to Ultimate 64 Command Interface ddescription,
-;; https://1541u-documentation.readthedocs.io/en/latest/command%20interface.html
-
-	.alias U64_CONTROL           $DF1C ; write
-	.alias U64_STATUS            $DF1C ; read
-	.alias U64_COMMAND_DATA      $DF1D ; write
-	.alias U64_IDENTIFICATION    $DF1D ; read
-	.alias U64_RESPONSE_DATA     $DF1E ; read only
-	.alias U64_STATUS_DATA       $DF1F ; read only
diff --git a/c64/basic/,platform_ultimate64/,aliases-ultimate64.s b/c64/kernal/,platform_ultimate64/,aliases_ultimate64.s
similarity index 100%
rename from c64/basic/,platform_ultimate64/,aliases-ultimate64.s
rename to c64/kernal/,platform_ultimate64/,aliases_ultimate64.s