nec/pc8001.cpp: .n80 quickload support

Author: angelosa

src/mame/nec/pc8001.cpp

@@ -46,6 +46,7 @@
 #include "speaker.h"
 #include "utf8.h"
 
+
 void pc8001_base_state::crtc_reverse_w(int state)
 {
 	// rvv acts as a global flip for reverse attribute meaning
@@ -723,6 +724,31 @@ void pc8001mk2sr_state::machine_reset()
 	//membank("bank2")->set_entry(2);
 }
 
+/* Snapquik */
+
+SNAPSHOT_LOAD_MEMBER(pc8001_state::snapshot_cb)
+{
+	if (m_ram->size() < 0x10000)
+		return std::make_pair(image_error::UNSUPPORTED, std::string("Configured RAM size must be 64K"));
+
+	if (image.length() > 0x8000)
+		return std::make_pair(image_error::INVALIDLENGTH, std::string());
+
+	uint8_t *ram = m_ram->pointer();
+
+	std::vector<u8> snapshot(image.length());
+	image.fread(&snapshot[0], image.length());
+
+	std::copy(std::begin(snapshot), std::end(snapshot), &ram[0x8000]);
+	m_maincpu->set_state_int(Z80_SP, ram[0xff3e] | (ram[0xff3f] << 8));
+	m_maincpu->set_pc(0xff3d);
+
+	//m_maincpu->pulse_input_line(INPUT_LINE_RESET, attotime::zero);
+
+	return std::make_pair(std::error_condition(), std::string());
+}
+
+
 /* Machine Drivers */
 
 void pc8001_state::pc8001(machine_config &config)
@@ -778,6 +804,9 @@ void pc8001_state::pc8001(machine_config &config)
 
 	RAM(config, RAM_TAG).set_default_size("16K").set_extra_options("32K,64K");
 
+	snapshot_image_device &snapshot(SNAPSHOT(config, "snapshot", "bin,n80", attotime::from_seconds(1)));
+	snapshot.set_load_callback(FUNC(pc8001_state::snapshot_cb));
+
 	SOFTWARE_LIST(config, "disk_n_list").set_original("pc8001_flop");
 
 	/* sound hardware */

src/mame/nec/pc8001.h

@@ -9,6 +9,7 @@
 #include "bus/nec_fdd/pc80s31k.h"
 #include "cpu/z80/z80.h"
 #include "imagedev/cassette.h"
+#include "imagedev/snapquik.h"
 #include "machine/buffer.h"
 #include "machine/i8251.h"
 #include "machine/i8255.h"
@@ -119,6 +120,8 @@ class pc8001_state : public pc8001_base_state
 	required_device<ram_device> m_ram;
 	required_memory_region m_rom;
 
+	DECLARE_SNAPSHOT_LOAD_MEMBER(snapshot_cb);
+
 private:
 	uint8_t port40_r();
 	void port40_w(uint8_t data);