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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
/***************************************************************************
m6510.c
6502 with 6 i/o pins, also known as 8500
***************************************************************************/
#include "emu.h"
#include "m6510.h"
const device_type M6510 = &device_creator<m6510_device>;
m6510_device::m6510_device(const machine_config &mconfig, std::string tag, device_t *owner, UINT32 clock) :
m6502_device(mconfig, M6510, "M6510", tag, owner, clock, "m6510", __FILE__),
read_port(*this),
write_port(*this), dir(0), port(0), drive(0)
{
pullup = 0x00;
floating = 0x00;
}
m6510_device::m6510_device(const machine_config &mconfig, device_type type, const char *name, std::string tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) :
m6502_device(mconfig, type, name, tag, owner, clock, shortname, source),
read_port(*this),
write_port(*this), dir(0), port(0), drive(0)
{
pullup = 0x00;
floating = 0x00;
}
void m6510_device::set_pulls(UINT8 _pullup, UINT8 _floating)
{
pullup = _pullup;
floating = _floating;
}
offs_t m6510_device::disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options)
{
return disassemble_generic(buffer, pc, oprom, opram, options, disasm_entries);
}
void m6510_device::device_start()
{
read_port.resolve_safe(0);
write_port.resolve_safe();
if(direct_disabled)
mintf = new mi_6510_nd(this);
else
mintf = new mi_6510_normal(this);
init();
save_item(NAME(pullup));
save_item(NAME(floating));
save_item(NAME(dir));
save_item(NAME(port));
save_item(NAME(drive));
}
void m6510_device::device_reset()
{
m6502_device::device_reset();
dir = 0x00;
port = 0x00;
drive = 0x00;
update_port();
}
void m6510_device::update_port()
{
drive = (port & dir) | (drive & ~dir);
write_port((port & dir) | (pullup & ~dir));
}
UINT8 m6510_device::get_port()
{
return (port & dir) | (pullup & ~dir);
}
UINT8 m6510_device::dir_r()
{
return dir;
}
UINT8 m6510_device::port_r()
{
return ((read_port() | (floating & drive)) & ~dir) | (port & dir);
}
void m6510_device::dir_w(UINT8 data)
{
dir = data;
update_port();
}
void m6510_device::port_w(UINT8 data)
{
port = data;
update_port();
}
m6510_device::mi_6510_normal::mi_6510_normal(m6510_device *_base)
{
base = _base;
}
UINT8 m6510_device::mi_6510_normal::read(UINT16 adr)
{
UINT8 res = program->read_byte(adr);
if(adr == 0x0000)
res = base->dir_r();
else if(adr == 0x0001)
res = base->port_r();
return res;
}
UINT8 m6510_device::mi_6510_normal::read_sync(UINT16 adr)
{
UINT8 res = sdirect->read_byte(adr);
if(adr == 0x0000)
res = base->dir_r();
else if(adr == 0x0001)
res = base->port_r();
return res;
}
UINT8 m6510_device::mi_6510_normal::read_arg(UINT16 adr)
{
UINT8 res = direct->read_byte(adr);
if(adr == 0x0000)
res = base->dir_r();
else if(adr == 0x0001)
res = base->port_r();
return res;
}
void m6510_device::mi_6510_normal::write(UINT16 adr, UINT8 val)
{
program->write_byte(adr, val);
if(adr == 0x0000)
base->dir_w(val);
else if(adr == 0x0001)
base->port_w(val);
}
m6510_device::mi_6510_nd::mi_6510_nd(m6510_device *_base) : mi_6510_normal(_base)
{
}
UINT8 m6510_device::mi_6510_nd::read_sync(UINT16 adr)
{
UINT8 res = sprogram->read_byte(adr);
if(adr == 0x0000)
res = base->dir_r();
else if(adr == 0x0001)
res = base->port_r();
return res;
}
UINT8 m6510_device::mi_6510_nd::read_arg(UINT16 adr)
{
UINT8 res = program->read_byte(adr);
if(adr == 0x0000)
res = base->dir_r();
else if(adr == 0x0001)
res = base->port_r();
return res;
}
#include "cpu/m6502/m6510.inc"
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