some more bits for exotic hardware support

c64/kernal/init/cartridge_check.s

@@ -1,4 +1,5 @@
 // #LAYOUT# STD *        #TAKE
+// #LAYOUT# X16 *        #IGNORE
 // #LAYOUT# *   KERNAL_0 #TAKE
 // #LAYOUT# *   *        #IGNORE
 

c64/kernal/init/fce2.hw_entry_reset.s

@@ -19,6 +19,8 @@ hw_entry_reset:
 	ldx #$FF
 	txs
 
+#if CONFIG_PLATFORM_COMMODORE_64
+
 	// The following routine is based on reading the public KERNAL jumptable routine
 	// list, and making unimaginative assumptions about what should be done on reset.
 	// Also, https://codebase64.org/doku.php?id=base:assembling_your_own_cart_rom_image was used
@@ -30,10 +32,10 @@ hw_entry_reset:
 	jmp (ICART_COLD_START)
 !:
 
-#if CONFIG_PLATFORM_COMMODORE_64
 	// Disable the screen (and set 40 columns) to prevent visual glitches later
 	ldx #$28
 	stx VIC_SCROLX
+
 #endif
 
 	// Initialising IO is obviously required. Also indicated by c64 prg p269.

c64/kernal/init/fd50.ramtas.s

@@ -49,6 +49,8 @@ RAMTAS:
 	ldx #>$033C
 	stx TAPE1+1
 
+#if CONFIG_PLATFORM_COMMODORE_64
+
 	// Set screen address pointer ("Compute's Mapping the 64" p238)
 	// This is obvious boiler plate containing no creative input, but to avoid
 	// unnecessarily similarity to the C64 KERNAL, we use X instead of A to do this,
@@ -95,4 +97,19 @@ ramtas_32k:
 	ldy #$80
 	bne !- // branch always
 
+#elif CONFIG_PLATFORM_COMMANDER_X16
+
+	ldx #>$0800
+	stx MEMSTR+1
+
+	ldy #$9F
+	sty MEMSIZK+1
+
+#else
+
+	.error "Please fill-in RAMTAS"
+
+#endif // platform
+
+
 #endif // ROM layout