Merge pull request #1630 from TomHarte/DNFS

Add DFS 0.9 to ROM catalogue; restrict CRTC pointer size.

Components/6845/CRTC6845.hpp

@@ -76,7 +76,7 @@ public:
 	CRTC6845(BusHandlerT &bus_handler) noexcept :
 		bus_handler_(bus_handler), status_(0) {}
 
-	void select_register(uint8_t r) {
+	void select_register(const uint8_t r) {
 		selected_register_ = r;
 	}
 
@@ -101,11 +101,11 @@ public:
 		// Per the BBC Wiki, attempting to read such a register results in 0.
 		if(selected_register_ < 12 || selected_register_ > 17) return 0x00;
 
-		return registers_[selected_register_];
+		return registers_[selected_register_.get()];
 	}
 
 	void set_register(const uint8_t value) {
-		switch(selected_register_) {
+		switch(selected_register_.get()) {
 			case 0:	layout_.horizontal.total = value;		break;
 			case 1: layout_.horizontal.displayed = value;	break;
 			case 2:	layout_.horizontal.start_sync = value;	break;
@@ -168,9 +168,9 @@ public:
 		};
 
 		if(selected_register_ < 16) {
-			registers_[selected_register_] = value & masks[selected_register_];
+			registers_[selected_register_.get()] = value & masks[selected_register_.get()];
 		}
-		if(selected_register_ == 31 && personality == Personality::UM6845R) {
+		if(selected_register_.get() == 31 && personality == Personality::UM6845R) {
 			dummy_register_ = value;
 		}
 	}
@@ -492,9 +492,6 @@ private:
 		/// Provide interlaced sync and scan even/odd lines depending on field.
 		SyncAndVideo,
 	};
-	enum class BlinkMode {
-		// TODO.
-	};
 
 	// Comments on the right provide the corresponding signal name in hoglet's VHDL implementation.
 	struct {
@@ -527,7 +524,7 @@ private:
 
 	uint8_t registers_[18]{};
 	uint8_t dummy_register_ = 0;
-	int selected_register_ = 0;
+	Numeric::SizedInt<5> selected_register_ = 0;
 
 	CharacterAddress character_counter_;		// h_counter
 	Numeric::SizedInt<3> character_reset_history_;	// sol

Machines/Acorn/BBCMicro/BBCMicro.cpp

@@ -766,7 +766,7 @@ public:
 
 		auto request = Request(Name::AcornBASICII) && Request(Name::BBCMicroMOS12);
 		if(target.has_1770dfs || tube_processor != TubeProcessor::None) {
-			request = request && Request(Name::BBCMicroDFS226);
+			request = request && Request(Name::BBCMicro1770DFS226);
 		}
 		if(target.has_adfs) {
 			request = request && Request(Name::BBCMicroADFS130);
@@ -794,13 +794,13 @@ public:
 			install_sideways(fs_slot--, roms.find(name)->second, false);
 		};
 		if(target.has_1770dfs) {
-			add_sideways(Name::BBCMicroDFS226);
+			add_sideways(Name::BBCMicro1770DFS226);
 		}
 		if(target.has_adfs) {
 			add_sideways(Name::BBCMicroADFS130);
 		}
 		if(!target.has_1770dfs && tube_processor != TubeProcessor::None) {
-			add_sideways(Name::BBCMicroDFS226);
+			add_sideways(Name::BBCMicro1770DFS226);
 		}
 
 		// Throw the tube ROM to its target.
@@ -1195,8 +1195,12 @@ private:
 		rom_write_masks_[slot] = is_writeable;
 		rom_inserted_[slot] = true;
 
-		assert(source.size() == roms_[slot].size());
+		assert(roms_[slot].size() % source.size() == 0);
-		std::copy(source.begin(), source.end(), roms_[slot].begin());
+		auto begin = roms_[slot].begin();
+		while(begin != roms_[slot].end()) {
+			std::copy(source.begin(), source.end(), begin);
+			std::advance(begin, source.size());
+		}
 	}
 
 	// MARK: - Components.

Machines/Utility/ROMCatalogue.cpp

@@ -430,7 +430,15 @@ const std::vector<Description> &Description::all_roms() {
 			0x3c14fc70u
 		},
 		{
-			BBCMicroDFS226,
+			BBCMicro8271DFS09,
+			"BBCMicro",
+			"the Acorn 8271 DFS 0.9 ROM",
+			"dfs09.rom",
+			8_kb,
+			0x3ce609cfu
+		},
+		{
+			BBCMicro1770DFS226,
 			"BBCMicro",
 			"the Acorn 1770 DFS 2.26 ROM",
 			"dfs-2.26.rom",

Machines/Utility/ROMCatalogue.hpp

@@ -82,7 +82,8 @@ enum Name {
 
 	// BBC Micro.
 	BBCMicroMOS12,
-	BBCMicroDFS226,
+	BBCMicro8271DFS09,
+	BBCMicro1770DFS226,
 	BBCMicroADFS130,
 	BBCMicroAdvancedDiscToolkit140,
 	BBCMicro6502Tube110,