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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/******************************************************************************
Psion ASIC7
******************************************************************************/
#include "emu.h"
#include "psion_asic7.h"
#define VERBOSE 0
//#define LOG_OUTPUT_FUNC osd_printf_info
#include "logmacro.h"
DEFINE_DEVICE_TYPE(PSION_ASIC7, psion_asic7_device, "psion_asic7", "Psion ASIC7")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
psion_asic7_device::psion_asic7_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, PSION_ASIC7, tag, owner, clock)
, m_as2rd_callback(*this, 0)
, m_as2wr_callback(*this)
, m_pgsel_callback(*this)
, m_lcdcom_callback(*this)
, m_caps_callback(*this)
, m_numl_callback(*this)
, m_scrl_callback(*this)
, m_batt_callback(*this)
, m_stby_callback(*this)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void psion_asic7_device::device_start()
{
save_item(NAME(m_a7_control));
save_item(NAME(m_a7_key_command));
save_item(NAME(m_a7_access_key));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void psion_asic7_device::device_reset()
{
m_a7_control = 0x08; // STBY
m_a7_key_command = 0x00;
m_a7_access_key = 0x00;
m_pgsel_callback(0);
}
//**************************************************************************
// READ/WRITE HANDLERS
//**************************************************************************
uint8_t psion_asic7_device::io_r(offs_t offset, uint8_t mem_mask)
{
uint8_t data = 0x00;
if (m_a7_access_key == 0x5aa5)
{
switch (offset & 8)
{
case 0x00:
data = m_as2rd_callback(offset);
break;
case 0x08:
switch (offset)
{
case 0x08: // System Control
// b0 RamEnable
// b1 PageSel
// b2 MaximEnable
// b3 StandEnable
// b4 CapsLockLcd
// b5 NumLockLcd
// b6 ScrlLockLcd
// b7 BatLowLcd
data = m_a7_control;
LOG("%s io_r: A7Control => %02x\n", machine().describe_context(), data);
break;
case 0x09: // Keyboard Command Busy Flag
// b0 KeyBusy
data = 0;
LOG("%s io_r: A7KeyStatus => %02x\n", machine().describe_context(), data);
break;
}
}
}
return data;
}
void psion_asic7_device::io_w(offs_t offset, uint8_t data, uint8_t mem_mask)
{
if (m_a7_access_key == 0x5aa5 || (offset & 0x0e) == 0x0a)
{
switch (offset & 0x08)
{
case 0x00:
m_as2wr_callback(offset, data);
break;
case 0x08:
switch (offset)
{
case 0x08: // System Control
// b0 RamEnable
// b1 PageSel
// b2 MaximEnable
// b3 StandEnable
// b4 CapsLockLcd
// b5 NumLockLcd
// b6 ScrlLockLcd
// b7 BatLowLcd
LOG("%s io_w: A7Control <= %02x\n", machine().describe_context(), data);
m_pgsel_callback(BIT(data, 1));
m_lcdcom_callback(BIT(data, 2));
if (BIT(data, 3) != BIT(m_a7_control, 3))
m_stby_callback(BIT(data, 3));
if (BIT(data, 4) != BIT(m_a7_control, 4))
m_caps_callback(BIT(data, 4));
if (BIT(data, 5) != BIT(m_a7_control, 5))
m_numl_callback(BIT(data, 5));
if (BIT(data, 6) != BIT(m_a7_control, 6))
m_scrl_callback(BIT(data, 6));
if (BIT(data, 7) != BIT(m_a7_control, 7))
m_batt_callback(BIT(data, 7));
m_a7_control = data;
break;
case 0x09: // Keyboard Command
LOG("%s io_w: A7KeyCommand <= %02x\n", machine().describe_context(), data);
m_a7_key_command = data;
break;
case 0x0a: // Access Key 0
case 0x0b: // Access Key 1
LOG("%s io_w: A7KeyAccess%d <= %02x\n", machine().describe_context(), (offset & 1) + 1, data);
switch (offset & 1)
{
case 0:
m_a7_access_key = (m_a7_access_key & 0xff00) | (data << 0);
break;
case 1:
m_a7_access_key = (m_a7_access_key & 0x00ff) | (data << 8);
break;
}
break;
}
}
}
}
void psion_asic7_device::update_ramen()
{
if (m_intr_state || m_nmi_state)
m_a7_control |= 0x01;
else
m_a7_control &= ~0x01;
}
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