mirror of
https://github.com/holub/mame
synced 2025-06-03 11:26:56 +03:00
08b42aabaa
(MESS) vic20: Added floating bus read support to VIC and cartridge interface. (MESS) vic10: Added floating bus read support to VIC-II and cartridge interface. (MESS) c64: Added floating bus read support to cartridge interface. [Curt Coder] (MESS) plus4: Added floating bus read support to TED and cartridge interface. Implemented some Diag264 test cartridge loopback connectors. [Curt Coder] (MESS) c16: Added PAL/NTSC variants. (nw) (MESS) v364: Fixed speech ROM mapping. (nw) (MESS) compis: Separated keyboard to its own file. (nw) (MESS) huebler: Cleanup. (nw)
134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
/**********************************************************************
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SilverRock Productions cartridge emulation
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Copyright MESS Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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**********************************************************************/
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/*
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PCB Layout
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----------
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e9048
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|=============|
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|=| LS00 |
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|=| LS273|
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|=| ROM |
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|=============|
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ROM - Atmel AT27C010-25PC 128Kx8 OTP EPROM "HUGO 2012"
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*/
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#include "c64_silverrock.h"
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//**************************************************************************
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// MACROS/CONSTANTS
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//**************************************************************************
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#define UNSCRAMBLE_ADDRESS(_offset) \
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BITSWAP16(_offset,15,14,13,12,1,0,2,3,11,10,9,8,7,6,5,4)
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#define UNSCRAMBLE_DATA(_data) \
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BITSWAP8(_data,7,6,5,4,0,1,2,3)
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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const device_type C64_SILVERROCK = &device_creator<c64_silverrock_cartridge_device>;
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// c64_silverrock_cartridge_device - constructor
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//-------------------------------------------------
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c64_silverrock_cartridge_device::c64_silverrock_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
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device_t(mconfig, C64_SILVERROCK, "C64 SilverRock cartridge", tag, owner, clock),
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device_c64_expansion_card_interface(mconfig, *this)
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void c64_silverrock_cartridge_device::device_start()
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{
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// state saving
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save_item(NAME(m_bank));
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}
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//-------------------------------------------------
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// device_reset - device-specific reset
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//-------------------------------------------------
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void c64_silverrock_cartridge_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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// c64_cd_r - cartridge data read
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//-------------------------------------------------
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UINT8 c64_silverrock_cartridge_device::c64_cd_r(address_space &space, offs_t offset, UINT8 data, int ba, int roml, int romh, int io1, int io2)
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{
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if (!roml)
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{
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offs_t addr = (m_bank << 13) | (offset & 0x1fff);
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addr = (addr & 0x10000) | UNSCRAMBLE_ADDRESS(addr);
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data = UNSCRAMBLE_DATA(m_roml[addr]);
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}
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return data;
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}
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//-------------------------------------------------
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// c64_cd_w - cartridge data write
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//-------------------------------------------------
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void c64_silverrock_cartridge_device::c64_cd_w(address_space &space, offs_t offset, UINT8 data, int ba, int roml, int romh, int io1, int io2)
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{
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if (!io1)
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{
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/*
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bit description
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0
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1
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2
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3
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4 A14
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5 A15
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6 A16
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7 A13
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*/
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m_bank = ((data >> 3) & 0x0e) | BIT(data, 7);
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}
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}
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