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Diffstat (limited to 'src/mame/access/acvirus.cpp')
-rw-r--r-- | src/mame/access/acvirus.cpp | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/mame/access/acvirus.cpp b/src/mame/access/acvirus.cpp new file mode 100644 index 00000000000..cd14ae6690a --- /dev/null +++ b/src/mame/access/acvirus.cpp @@ -0,0 +1,161 @@ +// 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 switching 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 communicating 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" + + +namespace { + +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") + { } + + void virus(machine_config &config); + + void init_virus(); + +private: + virtual void machine_start() override ATTR_COLD; + virtual void machine_reset() override ATTR_COLD; + + void virus_map(address_map &map) ATTR_COLD; + + required_device<cpu_device> m_maincpu; + required_memory_bank m_rombank; +}; + +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() +{ +} + +void acvirus_state::virus_map(address_map &map) +{ + map(0x0000, 0x7fff).rom().region("maincpu", 0); // fixed 32K of flash image + map(0x8000, 0xffff).bankr("rombank"); +} + +void acvirus_state::virus(machine_config &config) +{ + SAB80C535(config, m_maincpu, XTAL(12'000'000)); + m_maincpu->set_addrmap(AS_PROGRAM, &acvirus_state::virus_map); + + SPEAKER(config, "speaker", 2).front(); +} + +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 + +} // anonymous namespace + + +CONS( 1997, virusa, 0, 0, virus, virus, acvirus_state, empty_init, "Access", "Virus A", MACHINE_NOT_WORKING|MACHINE_NO_SOUND ) +CONS( 1999, virusb, 0, 0, virus, virus, acvirus_state, empty_init, "Access", "Virus B (Ver. T)", MACHINE_NOT_WORKING|MACHINE_NO_SOUND ) +CONS( 2002, virusc, 0, 0, virus, virus, acvirus_state, empty_init, "Access", "Virus C", MACHINE_NOT_WORKING|MACHINE_NO_SOUND ) +CONS( 2001, virusrck, 0, 0, virus, virus, acvirus_state, empty_init, "Access", "Virus Rack (Ver. T)", MACHINE_NOT_WORKING|MACHINE_NO_SOUND ) +CONS( 2002, virusrckxl, 0, 0, virus, virus, acvirus_state, empty_init, "Access", "Virus Rack XL", MACHINE_NOT_WORKING|MACHINE_NO_SOUND ) +CONS( 2004, viruscl, 0, 0, virus, virus, acvirus_state, empty_init, "Access", "Virus Classic", MACHINE_NOT_WORKING|MACHINE_NO_SOUND ) |