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// license:BSD-3-Clause
// copyright-holders:F. Ulivi
/**********************************************************************
i3001.cpp
Intel 3001 Microprogram Control Unit
**********************************************************************/
#include "emu.h"
#include "i3001.h"
// Device type definition
DEFINE_DEVICE_TYPE(I3001, i3001_device, "i3001", "Intel i3001 MCU")
i3001_device::i3001_device(const machine_config &mconfig , const char *tag , device_t *owner , uint32_t clock)
: device_t(mconfig , I3001 , tag , owner , clock)
, m_fo_handler(*this)
, m_px_handler(*this)
, m_sx_handler(*this)
{
}
void i3001_device::fc_w(uint8_t fc)
{
m_fc = fc;
switch (fc & 0b1100) {
case 0:
// FF0
m_fo = false;
break;
case 0b0100:
// FFC
m_fo = m_carry;
break;
case 0b1000:
// FFZ
m_fo = m_zero;
break;
case 0b1100:
// FF1
m_fo = true;
break;
}
m_fo_handler(m_fo);
}
WRITE_LINE_MEMBER(i3001_device::clk_w)
{
update();
}
void i3001_device::device_start()
{
m_fo_handler.resolve_safe();
m_px_handler.resolve_safe(0);
m_sx_handler.resolve_safe(0);
save_item(NAME(m_addr));
save_item(NAME(m_pr));
save_item(NAME(m_ac));
save_item(NAME(m_fc));
save_item(NAME(m_fi));
save_item(NAME(m_carry));
save_item(NAME(m_zero));
save_item(NAME(m_flag));
}
void i3001_device::update()
{
m_flag = m_fi;
// Decode FC10
switch (m_fc & 0b11) {
case 0:
// SCZ
m_carry = m_zero = m_flag;
break;
case 0b01:
// STZ
m_zero = m_flag;
break;
case 0b10:
// STC
m_carry = m_flag;
break;
default:
// HCZ
break;
}
// Decode AC
if ((m_ac & 0b1100000) == 0b0000000) {
// JCC
m_addr = pack_row_col(m_ac & 0b11111 , get_col(m_addr));
} else if ((m_ac & 0b1110000) == 0b0100000) {
// JZR
m_addr = pack_row_col(0 , m_ac & 0b1111);
} else if ((m_ac & 0b1110000) == 0b0110000) {
// JCR
m_addr = pack_row_col(get_row(m_addr) , m_ac & 0b1111);
} else if ((m_ac & 0b1111000) == 0b1110000) {
// JCE
m_addr = pack_row_col((get_row(m_addr) & 0b11000) | (m_ac & 0b00111) , get_col(m_addr));
} else if ((m_ac & 0b1110000) == 0b1000000) {
// JFL
m_addr = pack_row_col((get_row(m_addr) & 0b10000) | (m_ac & 0b01111) , (get_col(m_addr) & 0b1000) | 0b0010 | m_flag);
} else if ((m_ac & 0b1111000) == 0b1010000) {
// JCF
m_addr = pack_row_col((get_row(m_addr) & 0b11000) | (m_ac & 0b00111) , (get_col(m_addr) & 0b1000) | 0b0010 | m_carry);
} else if ((m_ac & 0b1111000) == 0b1011000) {
// JZF
m_addr = pack_row_col((get_row(m_addr) & 0b11000) | (m_ac & 0b00111) , (get_col(m_addr) & 0b1000) | 0b0010 | m_zero);
} else if ((m_ac & 0b1111000) == 0b1100000) {
// JPR
m_addr = pack_row_col((get_row(m_addr) & 0b11000) | (m_ac & 0b00111) , m_pr);
} else if ((m_ac & 0b1111000) == 0b1101000) {
// JLL
m_addr = pack_row_col((get_row(m_addr) & 0b11000) | (m_ac & 0b00111) , 0b0100 | (m_pr >> 2));
} else if ((m_ac & 0b1111100) == 0b1111100) {
// JRL
m_addr = pack_row_col((get_row(m_addr) & 0b11000) | 0b00100 | (m_ac & 0b00011) , 0b1100 | (m_pr & 0b0011));
} else {
// JPX
uint8_t px = m_px_handler() & 0b1111;
m_pr = m_sx_handler() & 0b1111;
m_addr = pack_row_col((get_row(m_addr) & 0b11100) | (m_ac & 0b00011) , px);
}
}
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