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+// license:BSD-3-Clause
+// copyright-holders:R. Belmont
+/***************************************************************************
+
+ acvirus.cpp - Access Virus series
+
+ Skeleton driver by R. Belmont
+
+ Hardware in brief:
+ Virus A: SAB 80C535-N (12 MHz), DSP56303 @ 66 MHz
+ Virus B: SAB 80C535-N (12 MHz), DSP56311 @ ??? MHz (illegible on PCB photo I've seen)
+ Virus C: SAF 80C515-L24N (24 MHz), DSP56362 @ 120 MHz
+
+ Virus Rack is same h/w as B, Rack XL is the same h/w as C.
+ Virus Classic is supposed to be the same h/w as B but not proven.
+
+ The various 80C5xx chips are i8051-based SoCs with additional I/O ports,
+ 256 bytes of internal RAM like the 8052, and an analog/digital converter.
+
+ The top 4 bits of port P5 select the bank at 0x8000. P5 is not implemented in
+ any of the MCS-51 variants we support yet.
+
+ Hardware Notes:
+ The DSP has three SRAM chips, probably 128 kbyte each
+ for a total of 128 kwords, mapped to address 0x20000. All three DSP
+ buses (P, X, Y) point to the same external memory. There's another 128
+ kbyte of battery backed SRAM for the 8051.
+
+ The firmware image fits exactly in an AM29F040-120PC flash chip, and is
+ bank switched into the 8051 program address space. The lower 0x8000
+ bytes of the address space always points to the first 0x8000 bytes of
+ flash (except during firmware upgrade, as I assume the programming
+ routine has do run from RAM). The upper 0x8000 bytes of the address
+ space can point to any 0x8000 sized bank in flash. A bank switch routine
+ is at 0x64B8, and will switch to e.g. bank 2 (offset 0x10000) when A =
+ 0x20. The low nibble is usually zero, but not always, and I don't know
+ how it's interpreted.
+
+ Banks 0-2 contain OS code and data, banks 3-6 contain DSP code and data,
+ and banks 8-14 seem to contain factory default settings. There are flash
+ programming routines at the beginning of banks 7 and 15, and two at the
+ end of bank 6. Not sure why there are so many, and not all are
+ identical, so there's probably additional bank swithing logic to match.
+ All display a charming "DO NOT TOUCH ME" message while programming. :)
+
+ The same bank switching also seems to affect external memory, but I'm
+ not sure how the smaller SRAM is mapped. Some external memory locations
+ are used for other tasks, like communicatng with the DSP.
+
+ The initial DSP program and data upload routine is at 0x1FAA. After
+ setting up the bus, it churns out all the 24-bit words in banks 3-6
+ (except for headers) as one stream. The DSP will interpret the first
+ word as a length, the second as address, and the following "length"
+ words will be stored at that address in program memory before execution
+ starts there. This is just a very short bootstrap program, which takes
+ care of receiving the remaining words in chunks. Each chunks starts with
+ three words - a command, an address, and optionally length. Commands 0-2
+ store data in P, X, or Y memory respectively. Command 3 splits each
+ 24-bit word into two 12-bit values and store each of them as a 24-bit
+ word in Y memory. Command 4 starts execution at the specified address,
+ and doesn't have a length.
+
+***************************************************************************/
+
+#include "emu.h"
+#include "cpu/mcs51/mcs51.h"
+#include "machine/intelfsh.h"
+#include "speaker.h"
+
+class acvirus_state : public driver_device
+{
+public:
+ acvirus_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag),
+ m_maincpu(*this, "maincpu"),
+ m_rombank(*this, "rombank")
+ { }
+
+ required_device<cpu_device> m_maincpu;
+ required_memory_bank m_rombank;
+
+ virtual void machine_start() override;
+ virtual void machine_reset() override;
+
+ DECLARE_DRIVER_INIT(virus);
+};
+
+void acvirus_state::machine_start()
+{
+ m_rombank->configure_entries(0, 15, memregion("maincpu")->base(), 0x8000);
+ m_rombank->set_entry(3);
+}
+
+void acvirus_state::machine_reset()
+{
+}
+
+static ADDRESS_MAP_START( virus_map, AS_PROGRAM, 8, acvirus_state )
+ AM_RANGE(0x0000, 0x7fff) AM_ROM AM_REGION("maincpu", 0) // fixed 32K of flash image
+ AM_RANGE(0x8000, 0xffff) AM_ROMBANK("rombank")
+ADDRESS_MAP_END
+
+static MACHINE_CONFIG_START( virus )
+ MCFG_CPU_ADD("maincpu", I8052, XTAL_12MHz)
+ MCFG_CPU_PROGRAM_MAP(virus_map)
+
+ MCFG_SPEAKER_STANDARD_STEREO("lspeaker", "rspeaker")
+MACHINE_CONFIG_END
+
+static INPUT_PORTS_START( virus )
+INPUT_PORTS_END
+
+ROM_START( virusa )
+ ROM_REGION(0x80000, "maincpu", 0)
+ ROM_LOAD( "virus_a_28.bin", 0x000000, 0x080000, CRC(087cd808) SHA1(fe3310a165c208473822455c75ee5b2a6de34bc8) )
+ROM_END
+
+ROM_START( virusb )
+ ROM_REGION(0x80000, "maincpu", 0)
+ ROM_LOAD( "virus_bt_490x049.bin", 0x000000, 0x080000, CRC(4ffc928a) SHA1(ee4b83e2eb1f01c73e37e2ff1d2edd653a0dcf5b) )
+ROM_END
+
+ROM_START( virusc )
+ ROM_REGION(0x80000, "maincpu", 0)
+ ROM_LOAD( "virus_c_650x352.bin", 0x000000, 0x080000, CRC(d44a9468) SHA1(fad9b896b39a43a1d46acb1d780b78b775a609b8) )
+ROM_END
+
+ROM_START( virusrck )
+ ROM_REGION(0x80000, "maincpu", 0)
+ ROM_LOAD( "virus_rt_210x071.bin", 0x000000, 0x080000, CRC(62b2bcc1) SHA1(241467bcb563736472a6e61f6c9c532590664500) )
+ROM_END
+
+ROM_START( virusrckxl )
+ ROM_REGION(0x80000, "maincpu", 0)
+ ROM_LOAD( "virus_xl_650x079.bin", 0x000000, 0x080000, CRC(d0721c46) SHA1(b7c292b66ba3690a4a50592e17321b9c4147621d) )
+ROM_END
+
+ROM_START( viruscl )
+ ROM_REGION(0x80000, "maincpu", 0)
+ ROM_LOAD( "virus_cl_061_release.bin", 0x000000, 0x080000, CRC(a202e443) SHA1(33d5f4ebbacc817ab1e5dd572e8dc755f6c5e253) )
+ROM_END
+
+CONS( 1997, virusa, 0, 0, virus, virus, acvirus_state, 0, "Access", "Virus A", MACHINE_NOT_WORKING|MACHINE_NO_SOUND )
+CONS( 1999, virusb, 0, 0, virus, virus, acvirus_state, 0, "Access", "Virus B (Ver. T)", MACHINE_NOT_WORKING|MACHINE_NO_SOUND )
+CONS( 2002, virusc, 0, 0, virus, virus, acvirus_state, 0, "Access", "Virus C", MACHINE_NOT_WORKING|MACHINE_NO_SOUND )
+CONS( 2001, virusrck, 0, 0, virus, virus, acvirus_state, 0, "Access", "Virus Rack (Ver. T)", MACHINE_NOT_WORKING|MACHINE_NO_SOUND )
+CONS( 2002, virusrckxl, 0, 0, virus, virus, acvirus_state, 0, "Access", "Virus Rack XL", MACHINE_NOT_WORKING|MACHINE_NO_SOUND )
+CONS( 2004, viruscl, 0, 0, virus, virus, acvirus_state, 0, "Access", "Virus Classic", MACHINE_NOT_WORKING|MACHINE_NO_SOUND )