motherboard extras can now be configured

CONFIG.md

@@ -23,6 +23,10 @@ Since Open ROMs is highly modular, it should be possible to add other platforms
 * 8KB ROM area `$A000`-`$BFFF`
 * 8KB ROM area `$E000`-`$FFFF`
 
+### `CONFIG_MB_MEGA_65`, `CONFIG_MB_ULTIMATE_64`
+
+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_GENERIC`
 
 If you don't know which variant to choose - select this one.

c64/,,config_generic.s

@@ -14,6 +14,9 @@
 
 #define CONFIG_PLATFORM_COMMODORE_64
 
+// #define CONFIG_MB_MEGA_65
+// #define CONFIG_MB_ULTIMATE_64
+
 #define CONFIG_BRAND_GENERIC
 // #define CONFIG_BRAND_TESTING
 // #define CONFIG_BRAND_MEGA_65

c64/,,config_mega65.s

@@ -7,6 +7,7 @@
 
 // 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
 
@@ -15,6 +16,9 @@
 
 #define CONFIG_PLATFORM_COMMODORE_64
 
+#define CONFIG_MB_MEGA_65
+// #define CONFIG_MB_ULTIMATE_64
+
 // #define CONFIG_BRAND_GENERIC
 // #define CONFIG_BRAND_TESTING
 #define CONFIG_BRAND_MEGA_65

c64/,,config_testing.s

@@ -7,7 +7,7 @@
 
 // Idea:
 // - enable compatibility-risky features
-// - enable code not normally used yto make sure it still compiles
+// - enable code not normally used - to make sure they still compile
 
 
 
@@ -15,6 +15,9 @@
 
 #define CONFIG_PLATFORM_COMMODORE_64
 
+// #define CONFIG_MB_MEGA_65
+// #define CONFIG_MB_ULTIMATE_64
+
 // #define CONFIG_BRAND_GENERIC
 #define CONFIG_BRAND_TESTING
 // #define CONFIG_BRAND_MEGA_65

c64/,,config_ultimate64.s

@@ -14,6 +14,9 @@
 
 #define CONFIG_PLATFORM_COMMODORE_64
 
+// #define CONFIG_MB_MEGA_65
+#define CONFIG_MB_ULTIMATE_64
+
 // #define CONFIG_BRAND_GENERIC
 // #define CONFIG_BRAND_TESTING
 // #define CONFIG_BRAND_MEGA_65

c64/aliases/,aliases_config.s

@@ -19,7 +19,31 @@
 
 
 
-// Check that platform and brand configuration is correct
+// Check that motherboard extras configuration is correct
+
+{
+	.var selected = 0;
+
+#if CONFIG_MB_MEGA_65
+	.eval selected++
+#endif
+#if CONFIG_MB_ULTIMATE_64
+	.eval selected++
+#endif
+
+	.if (selected > 1) .error "Please select at most one CONFIG_MB_* option"
+
+#if !CONFIG_PLATFORM_COMMODORE_64 && CONFIG_BRAND_MEGA_65 &&
+	.error "CONFIG_BRAND_MEGA_65 can only be used with CONFIG_PLATFORM_COMMODORE_64"
+#endif
+#if !CONFIG_PLATFORM_COMMODORE_64 && CONFIG_BRAND_ULTIMATE_64 &&
+	.error "CONFIG_BRAND_ULTIMATE_64 can only be used with CONFIG_PLATFORM_COMMODORE_64"
+#endif
+}
+
+
+
+// Check that brand configuration is correct
 
 {
 	.var selected = 0;
@@ -39,11 +63,11 @@
 
 	.if (selected != 1) .error "Please select exactly one CONFIG_BRAND_* option"
 
-#if !CONFIG_PLATFORM_COMMODORE_64 && CONFIG_BRAND_MEGA_65 &&
-	.error "CONFIG_BRAND_MEGA_65 can only be used with CONFIG_PLATFORM_COMMODORE_64"
+#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"
 #endif
-#if !CONFIG_PLATFORM_COMMODORE_64 && CONFIG_BRAND_ULTIMATE_64 &&
-	.error "CONFIG_BRAND_ULTIMATE_64 can only be used with CONFIG_PLATFORM_COMMODORE_64"
+#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"
 #endif
 }
 
@@ -121,8 +145,12 @@
 // Check if keyboard options are correct
 
 {
-#if CONFIG_LEGACY_SCNKEY && CONFIG_KEYBOARD_C128
-	.error "CONFIG_LEGACY_SCNKEY and CONFIG_KEYBOARD_C128 are mutually exclusive"
+#if CONFIG_LEGACY_SCNKEY && (CONFIG_KEYBOARD_C128 || CONFIG_KEYBOARD_C128_CAPS_LOCK)
+	.error "CONFIG_LEGACY_SCNKEY and CONFIG_KEYBOARD_C128* are mutually exclusive"
+#endif
+
+#if (CONFIG_MB_MEGA_65 || CONFIG_MB_ULTIMATE_64) && (CONFIG_KEYBOARD_C128 || CONFIG_KEYBOARD_C128_CAPS_LOCK)
+	.error "Selected CONFIG_MB_* is not compatible with CONFIG_KEYBOARD_C128*"
 #endif
 }
 

c64/kernal/init/e5a0.setup_vicii.s

@@ -18,6 +18,8 @@ setup_vicii:
  	dex
  	bpl !-
 
+#if !CONFIG_MB_MEGA_65 && !CONFIG_MB_ULTIMATE_64
+
  	// Disable C128 extra keys - just to be sure they won't interfere with anything
 
  	stx VIC_XSCAN
@@ -26,6 +28,8 @@ setup_vicii:
 
  	stx VIC_CLKRATE
 
+#endif
+
 	// Set up default IO values
 	// - [CM64] page 129       - VIC_SCROLY
 	// - [CM64] pages 140-144  - VIC_SCROLX