src/mess/machine/c64_neoram.c
| r0 | r14935 | |
|---|
| 1 | /**********************************************************************
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| 2 | |
| 3 | NeoRAM cartridge emulation
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| 4 | |
| 5 | Copyright MESS Team.
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| 6 | Visit http://mamedev.org for licensing and usage restrictions.
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| 7 | |
| 8 | **********************************************************************/
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| 9 | |
| 10 | #include "c64_neoram.h"
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| 11 | |
| 12 | |
| 13 | |
| 14 | //**************************************************************************
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| 15 | // DEVICE DEFINITIONS
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| 16 | //**************************************************************************
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| 17 | |
| 18 | const device_type C64_NEORAM = &device_creator<c64_neoram_cartridge_device>;
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| 19 | |
| 20 | |
| 21 | |
| 22 | //**************************************************************************
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| 23 | // LIVE DEVICE
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| 24 | //**************************************************************************
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| 25 | |
| 26 | //-------------------------------------------------
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| 27 | // c64_neoram_cartridge_device - constructor
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| 28 | //-------------------------------------------------
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| 29 | |
| 30 | c64_neoram_cartridge_device::c64_neoram_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
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| 31 | device_t(mconfig, C64_NEORAM, "C64 NeoRAM cartridge", tag, owner, clock),
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| 32 | device_c64_expansion_card_interface(mconfig, *this),
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| 33 | device_nvram_interface(mconfig, *this)
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| 34 | {
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| 35 | }
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| 36 | |
| 37 | |
| 38 | //-------------------------------------------------
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| 39 | // device_start - device-specific startup
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| 40 | //-------------------------------------------------
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| 41 | |
| 42 | void c64_neoram_cartridge_device::device_start()
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| 43 | {
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| 44 | // allocate memory
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| 45 | c64_nvram_pointer(machine(), 0x200000);
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| 46 | |
| 47 | // state saving
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| 48 | save_item(NAME(m_bank));
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| 49 | }
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| 50 | |
| 51 | |
| 52 | //-------------------------------------------------
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| 53 | // device_reset - device-specific reset
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| 54 | //-------------------------------------------------
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| 55 | |
| 56 | void c64_neoram_cartridge_device::device_reset()
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| 57 | {
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| 58 | m_bank = 0;
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| 59 | }
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| 60 | |
| 61 | |
| 62 | //-------------------------------------------------
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| 63 | // c64_cd_r - cartridge data read
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| 64 | //-------------------------------------------------
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| 65 | |
| 66 | UINT8 c64_neoram_cartridge_device::c64_cd_r(address_space &space, offs_t offset, int roml, int romh, int io1, int io2)
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| 67 | {
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| 68 | UINT8 data = 0;
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| 69 | |
| 70 | if (!io1)
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| 71 | {
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| 72 | offs_t addr = (m_bank << 8) | (offset & 0xff);
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| 73 | data = m_nvram[addr];
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| 74 | }
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| 75 | |
| 76 | return data;
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| 77 | }
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| 78 | |
| 79 | |
| 80 | //-------------------------------------------------
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| 81 | // c64_cd_w - cartridge data write
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| 82 | //-------------------------------------------------
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| 83 | |
| 84 | void c64_neoram_cartridge_device::c64_cd_w(address_space &space, offs_t offset, UINT8 data, int roml, int romh, int io1, int io2)
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| 85 | {
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| 86 | if (!io1)
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| 87 | {
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| 88 | offs_t addr = (m_bank << 8) | (offset & 0xff);
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| 89 | m_nvram[addr] = data;
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| 90 | }
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| 91 | else if (!io2)
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| 92 | {
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| 93 | if (BIT(offset, 0))
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| 94 | {
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| 95 | m_bank = ((data & 0x7f) << 6) | (m_bank & 0x3f);
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| 96 | }
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| 97 | else
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| 98 | {
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| 99 | m_bank = (m_bank & 0x1fc0) | (data & 0x3f);
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| 100 | }
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| 101 | }
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| 102 | }
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src/mess/machine/c64_neoram.h
| r0 | r14935 | |
|---|
| 1 | /**********************************************************************
|
| 2 | |
| 3 | NeoRAM cartridge emulation
|
| 4 | |
| 5 | Copyright MESS Team.
|
| 6 | Visit http://mamedev.org for licensing and usage restrictions.
|
| 7 | |
| 8 | **********************************************************************/
|
| 9 | |
| 10 | #pragma once
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| 11 | |
| 12 | #ifndef __NEORAM__
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| 13 | #define __NEORAM__
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| 14 | |
| 15 | |
| 16 | #include "emu.h"
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| 17 | #include "machine/c64exp.h"
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| 18 | |
| 19 | |
| 20 | |
| 21 | //**************************************************************************
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| 22 | // TYPE DEFINITIONS
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| 23 | //**************************************************************************
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| 24 | |
| 25 | // ======================> c64_neoram_cartridge_device
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| 26 | |
| 27 | class c64_neoram_cartridge_device : public device_t,
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| 28 | public device_c64_expansion_card_interface,
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| 29 | public device_nvram_interface
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| 30 | {
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| 31 | public:
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| 32 | // construction/destruction
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| 33 | c64_neoram_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
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| 34 | |
| 35 | protected:
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| 36 | // device-level overrides
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| 37 | virtual void device_start();
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| 38 | virtual void device_reset();
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| 39 | virtual void device_config_complete() { m_shortname = "c64_neoram"; }
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| 40 | |
| 41 | // device_nvram_interface overrides
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| 42 | virtual void nvram_default() { }
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| 43 | virtual void nvram_read(emu_file &file) { if (m_nvram != NULL) { file.read(m_nvram, m_nvram_size); } }
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| 44 | virtual void nvram_write(emu_file &file) { if (m_nvram != NULL) { file.write(m_nvram, m_nvram_size); } }
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| 45 | |
| 46 | // device_c64_expansion_card_interface overrides
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| 47 | virtual UINT8 c64_cd_r(address_space &space, offs_t offset, int roml, int romh, int io1, int io2);
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| 48 | virtual void c64_cd_w(address_space &space, offs_t offset, UINT8 data, int roml, int romh, int io1, int io2);
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| 49 | |
| 50 | private:
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| 51 | UINT16 m_bank;
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| 52 | };
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| 53 | |
| 54 | |
| 55 | // device type definition
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| 56 | extern const device_type C64_NEORAM;
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| 57 | |
| 58 | |
| 59 | #endif
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