mirror of
https://github.com/holub/mame
synced 2025-10-05 08:41:31 +03:00
991bcbd1e5
- Rewritten cart emulation to use slot devices (many "mappers" do not fully work) and unified cart handling among 8bit home computers, XEGS and Atari 5200 - Added support for loading carts with bankswitch to all XL/XE models - Added support for loading XEGS carts in Atari 8bits home computers (XEGS instead will only load XEGS games until support for the keyboard add-on is included) - Big clean up of the driver, simplifying memory map, removing writes to ROM, etc. - Changed NOT_WORKING flag to IMPERFECT_GRAPHICS in 600XL, 65XE, 800XE and XEGS since they should now be working to the same extent of the 800XL, and bugs shall be reported. as a consequence of the above changes, the new softlists a800.xml, a5200.xml and xegs.xml are not compatible anymore with 0.154: keep the old xmls until 0.155 if you don't compile your own exe
201 lines
4.0 KiB
C
201 lines
4.0 KiB
C
/***********************************************************************************************************
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A800 ROM cart emulation
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***********************************************************************************************************/
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#include "emu.h"
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#include "oss.h"
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//-------------------------------------------------
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// constructor
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//-------------------------------------------------
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const device_type A800_ROM_OSS34 = &device_creator<a800_rom_oss34_device>;
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const device_type A800_ROM_OSS43 = &device_creator<a800_rom_oss43_device>;
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const device_type A800_ROM_OSS91 = &device_creator<a800_rom_oss91_device>;
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a800_rom_oss34_device::a800_rom_oss34_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: a800_rom_device(mconfig, A800_ROM_OSS34, "Atari 800 ROM Carts OSS-034M", tag, owner, clock, "a800_034m", __FILE__)
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{
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}
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a800_rom_oss43_device::a800_rom_oss43_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: a800_rom_device(mconfig, A800_ROM_OSS43, "Atari 800 ROM Carts OSS-043M", tag, owner, clock, "a800_043m", __FILE__)
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{
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}
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a800_rom_oss91_device::a800_rom_oss91_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: a800_rom_device(mconfig, A800_ROM_OSS91, "Atari 800 ROM Carts OSS-M091", tag, owner, clock, "a800_m091", __FILE__)
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{
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}
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void a800_rom_oss34_device::device_start()
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{
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save_item(NAME(m_bank));
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}
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void a800_rom_oss34_device::device_reset()
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{
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m_bank = 1;
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}
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void a800_rom_oss43_device::device_start()
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{
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save_item(NAME(m_bank));
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}
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void a800_rom_oss43_device::device_reset()
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{
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m_bank = 0;
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}
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void a800_rom_oss91_device::device_start()
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{
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save_item(NAME(m_bank));
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}
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void a800_rom_oss91_device::device_reset()
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{
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m_bank = 0;
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}
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/*-------------------------------------------------
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mapper specific handlers
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-------------------------------------------------*/
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/*-------------------------------------------------
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OSS 034M
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This apparently comes from a dump with the wrong bank order...
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investigate whether we should remove it!
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-------------------------------------------------*/
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READ8_MEMBER(a800_rom_oss34_device::read_80xx)
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{
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if (offset >= 0x1000)
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return m_rom[(offset & 0xfff) + 0x3000];
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else if (m_bank == 3)
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return 0xff;
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else
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return m_rom[(offset & 0xfff) + (m_bank * 0x1000)];
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}
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WRITE8_MEMBER(a800_rom_oss34_device::write_d5xx)
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{
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switch (offset & 0x0f)
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{
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case 0:
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case 1:
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m_bank = 0;
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break;
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case 2:
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case 6:
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m_bank = 3; // in this case the ROM gets disabled and 0xff is returned in 0xa000-0xafff
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break;
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case 3:
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case 7:
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m_bank = 1;
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break;
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case 4:
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case 5:
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m_bank = 2;
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break;
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default:
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break;
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}
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}
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/*-------------------------------------------------
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OSS 043M
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Same as above but with correct bank order
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-------------------------------------------------*/
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READ8_MEMBER(a800_rom_oss43_device::read_80xx)
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{
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if (offset >= 0x1000)
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return m_rom[(offset & 0xfff) + 0x3000];
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else if (m_bank == 3)
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return 0xff;
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else
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return m_rom[(offset & 0xfff) + (m_bank * 0x1000)];
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}
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WRITE8_MEMBER(a800_rom_oss43_device::write_d5xx)
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{
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switch (offset & 0x0f)
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{
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case 0:
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case 1:
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m_bank = 0;
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break;
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case 2:
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case 6:
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m_bank = 3; // in this case the ROM gets disabled and 0xff is returned in 0xa000-0xafff
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break;
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case 3:
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case 7:
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m_bank = 2;
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break;
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case 4:
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case 5:
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m_bank = 1;
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break;
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default:
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break;
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}
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}
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/*-------------------------------------------------
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OSS M091
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Simplified banking system which only uses two
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address lines (A0 & A3)
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-------------------------------------------------*/
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READ8_MEMBER(a800_rom_oss91_device::read_80xx)
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{
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if (offset >= 0x1000)
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return m_rom[offset & 0xfff];
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else
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return m_rom[(offset & 0xfff) + (m_bank * 0x1000)];
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}
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WRITE8_MEMBER(a800_rom_oss91_device::write_d5xx)
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{
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switch (offset & 0x09)
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{
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case 0:
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m_bank = 1;
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break;
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case 1:
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m_bank = 3;
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break;
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case 9:
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m_bank = 2;
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break;
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default:
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break;
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}
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}
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