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Diffstat (limited to 'src/mess/machine/6883sam.h')
-rw-r--r-- | src/mess/machine/6883sam.h | 266 |
1 files changed, 0 insertions, 266 deletions
diff --git a/src/mess/machine/6883sam.h b/src/mess/machine/6883sam.h deleted file mode 100644 index 772fe38d63f..00000000000 --- a/src/mess/machine/6883sam.h +++ /dev/null @@ -1,266 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Nathan Woods -/*************************************************************************** - - 6883sam.h - - Motorola 6883 Synchronous Address Multiplexer - -***************************************************************************/ - -#pragma once - -#ifndef __6883SAM__ -#define __6883SAM__ - -#include "emu.h" - -#define MCFG_SAM6883_ADD(_tag, _clock, _cputag, _cpuspace) \ - MCFG_DEVICE_ADD(_tag, SAM6883, _clock) \ - sam6883_device::configure_cpu(*device, _cputag, _cpuspace); - -#define MCFG_SAM6883_RES_CALLBACK(_read) \ - devcb = &sam6883_device::set_res_rd_callback(*device, DEVCB_##_read); - - -//************************************************************************** -// SAM6883 CORE -//************************************************************************** - -// base class so that GIME emulation can use some functionality -class sam6883_friend_device -{ -public: - sam6883_friend_device() { m_cpu = NULL; m_sam_state = 0x0000; } - -protected: - // SAM state constants - static const UINT16 SAM_STATE_TY = 0x8000; - static const UINT16 SAM_STATE_M1 = 0x4000; - static const UINT16 SAM_STATE_M0 = 0x2000; - static const UINT16 SAM_STATE_R1 = 0x1000; - static const UINT16 SAM_STATE_R0 = 0x0800; - static const UINT16 SAM_STATE_P1 = 0x0400; - static const UINT16 SAM_STATE_F6 = 0x0200; - static const UINT16 SAM_STATE_F5 = 0x0100; - static const UINT16 SAM_STATE_F4 = 0x0080; - static const UINT16 SAM_STATE_F3 = 0x0040; - static const UINT16 SAM_STATE_F2 = 0x0020; - static const UINT16 SAM_STATE_F1 = 0x0010; - static const UINT16 SAM_STATE_F0 = 0x0008; - static const UINT16 SAM_STATE_V2 = 0x0004; - static const UINT16 SAM_STATE_V1 = 0x0002; - static const UINT16 SAM_STATE_V0 = 0x0001; - - // incidentals - cpu_device * m_cpu; - - // device state - UINT16 m_sam_state; - - ATTR_FORCE_INLINE UINT16 display_offset(void) - { - return ((m_sam_state & (SAM_STATE_F0|SAM_STATE_F1|SAM_STATE_F2|SAM_STATE_F3|SAM_STATE_F4|SAM_STATE_F5|SAM_STATE_F6)) / SAM_STATE_F0) << 9; - } - - ATTR_FORCE_INLINE UINT16 alter_sam_state(offs_t offset) - { - /* determine the mask */ - UINT16 mask = 1 << (offset >> 1); - - /* determine the new state */ - UINT16 new_state; - if (offset & 0x0001) - new_state = m_sam_state | mask; - else - new_state = m_sam_state & ~mask; - - /* specify the new state */ - UINT16 xorval = m_sam_state ^ new_state; - m_sam_state = new_state; - return xorval; - } - - void update_cpu_clock(void); -}; - -class sam6883_device : public device_t, public sam6883_friend_device -{ -public: - sam6883_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); - - template<class _Object> static devcb_base &set_res_rd_callback(device_t &device, _Object object) { return downcast<sam6883_device &>(device).m_read_res.set_callback(object); } - - static void configure_cpu(device_t &device, const char *tag, address_spacenum space) - { - sam6883_device &dev = downcast<sam6883_device &>(device); - dev.m_cpu_tag = tag; - dev.m_cpu_space_ref = space; - } - - // called to configure banks - void configure_bank(int bank, UINT8 *memory, UINT32 memory_size, bool is_read_only); - void configure_bank(int bank, read8_delegate rhandler, write8_delegate whandler); - - // typically called by VDG - ATTR_FORCE_INLINE DECLARE_READ8_MEMBER( display_read ) - { - if (offset == (offs_t) ~0) - { - /* the VDG is telling the counter to reset */ - m_counter = display_offset(); - m_counter_xdiv = 0; - m_counter_ydiv = 0; - } - else if ((offset & 1) != (m_counter & 0x0001)) - { - /* DA0 has been toggled - first bump B0-B3 of the counter */ - bool bit3_carry = (m_counter & 0x000F) == 0x000F; - m_counter = (m_counter & ~0x000F) | ((m_counter + 1) & 0x000F); - - /* and apply the carry (if applicable */ - if (bit3_carry) - counter_carry_bit3(); - } - return m_read_res((m_counter & m_counter_mask) | m_counter_or); - } - - DECLARE_WRITE_LINE_MEMBER( hs_w ); - - // typically called by machine - address_space *mpu_address_space(void) const { return m_cpu_space; } - void set_bank_offset(int bank, offs_t offset); - -protected: - // device-level overrides - virtual void device_start(); - virtual void device_reset(); - virtual void device_post_load(); - -private: - // represents an external memory bank - memory or IO that the SAM - // points to with the S2/S1/S0 output - struct sam_bank - { - UINT8 * m_memory; - UINT32 m_memory_size; - offs_t m_memory_offset; - bool m_memory_read_only; - read8_delegate m_rhandler; - write8_delegate m_whandler; - }; - - // represents one of the memory "spaces" (e.g. - $8000-$9FFF) that - // can ultimately point to a bank - template<UINT16 _addrstart, UINT16 _addrend> - class sam_space - { - public: - sam_space(sam6883_device &owner); - void point(const sam_bank *bank, UINT16 offset, UINT16 mask); - - private: - sam6883_device & m_owner; - memory_bank * m_read_bank; - memory_bank * m_write_bank; - UINT16 m_mask; - - address_space &cpu_space() const; - void point_specific_bank(const sam_bank *bank, UINT16 offset, UINT16 mask, memory_bank *&memory_bank, INT32 addrstart, INT32 addrend, bool is_write); - }; - - const char * m_cpu_tag; - address_spacenum m_cpu_space_ref; - - // incidentals - address_space * m_cpu_space; - devcb_read8 m_read_res; - sam_bank m_banks[8]; - sam_space<0x0000, 0x7FFF> m_space_0000; - sam_space<0x8000, 0x9FFF> m_space_8000; - sam_space<0xA000, 0xBFFF> m_space_A000; - sam_space<0xC000, 0xFEFF> m_space_C000; - sam_space<0xFF00, 0xFF1F> m_space_FF00; - sam_space<0xFF20, 0xFF3F> m_space_FF20; - sam_space<0xFF40, 0xFF5F> m_space_FF40; - sam_space<0xFF60, 0xFFBF> m_space_FF60; - sam_space<0xFFE0, 0xFFFF> m_space_FFE0; - UINT16 m_counter_mask; - UINT16 m_counter_or; - - // SAM state - UINT16 m_counter; - UINT8 m_counter_xdiv; - UINT8 m_counter_ydiv; - - // dummy scratch memory - UINT8 m_dummy[0x8000]; - - // typically called by CPU - DECLARE_READ8_MEMBER( read ); - DECLARE_WRITE8_MEMBER( write ); - - // called when there is a carry out of bit 3 on the counter - ATTR_FORCE_INLINE void counter_carry_bit3(void) - { - UINT8 x_division; - switch((m_sam_state & (SAM_STATE_V2|SAM_STATE_V1|SAM_STATE_V0)) / SAM_STATE_V0) - { - case 0x00: x_division = 1; break; - case 0x01: x_division = 3; break; - case 0x02: x_division = 1; break; - case 0x03: x_division = 2; break; - case 0x04: x_division = 1; break; - case 0x05: x_division = 1; break; - case 0x06: x_division = 1; break; - case 0x07: x_division = 1; break; - default: - fatalerror("Should not get here\n"); - return; - } - - if (++m_counter_xdiv >= x_division) - { - m_counter_xdiv = 0; - m_counter ^= 0x0010; - if ((m_counter & 0x0010) == 0x0000) - counter_carry_bit4(); - } - } - - // called when there is a carry out of bit 4 on the counter - ATTR_FORCE_INLINE void counter_carry_bit4(void) - { - UINT8 y_division; - switch((m_sam_state & (SAM_STATE_V2|SAM_STATE_V1|SAM_STATE_V0)) / SAM_STATE_V0) - { - case 0x00: y_division = 12; break; - case 0x01: y_division = 1; break; - case 0x02: y_division = 3; break; - case 0x03: y_division = 1; break; - case 0x04: y_division = 2; break; - case 0x05: y_division = 1; break; - case 0x06: y_division = 1; break; - case 0x07: y_division = 1; break; - default: - fatalerror("Should not get here\n"); - return; - } - - if (++m_counter_ydiv >= y_division) - { - m_counter_ydiv = 0; - m_counter += 0x0020; - } - } - - // other members - void configure_bank(int bank, UINT8 *memory, UINT32 memory_size, bool is_read_only, read8_delegate rhandler, write8_delegate whandler); - void horizontal_sync(void); - void update_state(void); - void update_memory(void); -}; - -extern const device_type SAM6883; - -#endif /* __6883SAM__ */ |