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// license:BSD-3-Clause
// copyright-holders:Juergen Buchmueller
/*****************************************************************************
*
* Xerox AltoII memory mapped I/O keyboard
*
*****************************************************************************/
#include "alto2cpu.h"
/**
* @brief read the keyboard address matrix
*
* @param addr memory mapped I/O address to be read
* @return keyboard matrix value for address modulo 4
*/
READ16_MEMBER( alto2_cpu_device::kbd_ad_r )
{
UINT16 data = 0177777;
switch (offset & 3) {
case 0:
data = machine().root_device().ioport("ROW0")->read();
break;
case 1:
data = machine().root_device().ioport("ROW1")->read();
break;
case 2:
data = machine().root_device().ioport("ROW2")->read();
break;
case 3:
data = machine().root_device().ioport("ROW3")->read();
break;
}
m_kbd.matrix[offset & 03] = data;
if (!space.debugger_access()) {
LOG((this,LOG_KBD,2," read KBDAD+%o (%#o)\n", offset & 3, data));
}
if (0 == (offset & 3) && (m_kbd.bootkey != 0177777)) {
if (!space.debugger_access()) {
LOG((this,0,2," boot keys (%#o & %#o)\n", data, m_kbd.bootkey));
}
data &= m_kbd.bootkey;
m_kbd.bootkey = 0177777;
}
return data;
}
void alto2_cpu_device::init_kbd(UINT16 bootkey)
{
m_kbd.bootkey = bootkey;
}
void alto2_cpu_device::exit_kbd()
{
// nothing to do yet
}
void alto2_cpu_device::reset_kbd()
{
m_kbd.matrix[0] = 0177777;
m_kbd.matrix[1] = 0177777;
m_kbd.matrix[2] = 0177777;
m_kbd.matrix[3] = 0177777;
}
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