diff options
Diffstat (limited to 'src/devices/bus/bbc/cart/click.cpp')
-rw-r--r-- | src/devices/bus/bbc/cart/click.cpp | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/src/devices/bus/bbc/cart/click.cpp b/src/devices/bus/bbc/cart/click.cpp new file mode 100644 index 00000000000..175de5eeae3 --- /dev/null +++ b/src/devices/bus/bbc/cart/click.cpp @@ -0,0 +1,113 @@ +// license:BSD-3-Clause +// copyright-holders:Nigel Barnes +/*************************************************************************** + + Slogger Click cartridge emulation + + http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/Slogger_Click.html + + The Master version of the Click cartridge differs from the Electron + version: + Master 128 Electron + ROM 16K 32K + RAM (battery) 8K 32K + + The data lines D1 and D2 are swapped between edge connector and ROM/RAM. + +***************************************************************************/ + +#include "emu.h" +#include "click.h" + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +DEFINE_DEVICE_TYPE(BBC_CLICK, bbc_click_device, "bbc_click", "Slogger Click (Master 128) cartridge") + + +//------------------------------------------------- +// INPUT_PORTS( clickm ) +//------------------------------------------------- + +INPUT_PORTS_START(clickm) + PORT_START("BUTTON") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_BUTTON1) PORT_NAME("Click") PORT_CODE(KEYCODE_HOME) PORT_CHANGED_MEMBER(DEVICE_SELF, bbc_click_device, click_button, 0) +INPUT_PORTS_END + + +//------------------------------------------------- +// input_ports - device-specific input ports +//------------------------------------------------- + +ioport_constructor bbc_click_device::device_input_ports() const +{ + return INPUT_PORTS_NAME(clickm); +} + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// bbc_click_device - constructor +//------------------------------------------------- + +bbc_click_device::bbc_click_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : device_t(mconfig, BBC_CLICK, tag, owner, clock) + , device_bbc_cart_interface(mconfig, *this) +{ +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void bbc_click_device::device_start() +{ +} + + +//------------------------------------------------- +// read - cartridge data read +//------------------------------------------------- + +uint8_t bbc_click_device::read(offs_t offset, int infc, int infd, int romqa, int oe, int oe2) +{ + uint8_t data = 0xff; + + if (oe) + { + if (offset & 0x2000) + { + data = m_nvram[offset & 0x1fff]; + } + else + { + data = m_rom[(offset & 0x1fff) | (romqa << 13)]; + } + } + + return bitswap<8>(data, 7, 6, 5, 4, 3, 1, 2, 0); +} + +//------------------------------------------------- +// write - cartridge data write +//------------------------------------------------- + +void bbc_click_device::write(offs_t offset, uint8_t data, int infc, int infd, int romqa, int oe, int oe2) +{ + if (oe) + { + if (offset & 0x2000) + { + m_nvram[offset & 0x1fff] = bitswap<8>(data, 7, 6, 5, 4, 3, 1, 2, 0); + } + } +} + +INPUT_CHANGED_MEMBER(bbc_click_device::click_button) +{ + m_slot->irq_w(!newval); +} |