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-rw-r--r--src/devices/bus/c64/pagefox.cpp137
1 files changed, 137 insertions, 0 deletions
diff --git a/src/devices/bus/c64/pagefox.cpp b/src/devices/bus/c64/pagefox.cpp
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+++ b/src/devices/bus/c64/pagefox.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ Scanntronik Pagefox cartridge emulation
+
+**********************************************************************/
+
+/*
+
+ PCB Layout
+ ----------
+
+ |===========================|
+ |=| |
+ |=| RAM LS11 |
+ |=| |
+ |=| LS139 |
+ |=| ROM0 |
+ |=| LS273 |
+ |=| |
+ |=| ROM1 LS00 |
+ |===========================|
+
+ RAM - NEC D43256-12L 32Kx8 RAM
+ ROM0 - SGS M27256-2FI 32Kx8 EPROM
+ ROM1 - National Instruments NMC27C256Q 32Kx8 EPROM
+
+*/
+
+#include "pagefox.h"
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type C64_PAGEFOX = &device_creator<c64_pagefox_cartridge_device>;
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// c64_pagefox_cartridge_device - constructor
+//-------------------------------------------------
+
+c64_pagefox_cartridge_device::c64_pagefox_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, C64_PAGEFOX, "C64 Pagefox cartridge", tag, owner, clock, "c64_pagefox", __FILE__),
+ device_c64_expansion_card_interface(mconfig, *this),
+ m_ram(*this, "ram")
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void c64_pagefox_cartridge_device::device_start()
+{
+ // allocate memory
+ m_ram.allocate(0x8000);
+
+ // state saving
+ save_item(NAME(m_bank));
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void c64_pagefox_cartridge_device::device_reset()
+{
+ m_bank = 0;
+}
+
+
+//-------------------------------------------------
+// c64_cd_r - cartridge data read
+//-------------------------------------------------
+
+UINT8 c64_pagefox_cartridge_device::c64_cd_r(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2)
+{
+ if (!roml || !romh)
+ {
+ if (BIT(m_bank, 3))
+ {
+ offs_t addr = (BIT(m_bank, 1) << 14) | (offset & 0x3fff);
+ data = m_ram[addr];
+ }
+ else
+ {
+ int bank = (m_bank >> 1) & 0x07;
+ offs_t addr = (bank << 14) | (offset & 0x3fff);
+ data = m_roml[addr];
+ }
+ }
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// c64_cd_w - cartridge data write
+//-------------------------------------------------
+
+void c64_pagefox_cartridge_device::c64_cd_w(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2)
+{
+ if (offset >= 0x8000 && offset < 0xc000)
+ {
+ if (BIT(m_bank, 3))
+ {
+ offs_t addr = (BIT(m_bank, 1) << 14) | (offset & 0x3fff);
+ m_ram[addr] = data;
+ }
+ }
+ else if (!io1 && BIT(offset, 7))
+ {
+ if (data == 0xff)
+ {
+ m_game = 1;
+ m_exrom = 1;
+ }
+ else
+ {
+ m_game = 0;
+ m_exrom = 0;
+ }
+
+ m_bank = data;
+ }
+}