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zexall: get rid of unrealistic overclock, get rid of logerroring exactly what's already on the video terminal, add savestates, small cleanups (nw)

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hap 2017-10-23 15:50:22 +02:00
parent 1af9a994e6
commit e8e072d534
1 changed files with 54 additions and 55 deletions
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109
src/mame/drivers/zexall.cpp
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@ -12,22 +12,19 @@
Ram 0000-FFFF (preloaded with binary)
Special calls take place for three ram values (this interface was designed by kevtris):
FFFD - 'ack' - shared ram with output device; z80 reads from here and considers the byte at FFFF read if this value incremented
FFFE - 'req' - shared ram with output device; z80 writes an incrementing value to FFFE to indicate that there is a byte waiting at FFFF and hence requesting the output device on the other end do something about it, until FFFD is incremented by the output device to acknowledge receipt
FFFE - 'req' - shared ram with output device; z80 writes an incrementing value to FFFE to indicate that there is a byte waiting at FFFF
and hence requesting the output device on the other end do something about it, until FFFD is incremented by the
output device to acknowledge receipt
FFFF - 'data' - shared ram with output device; z80 writes the data to be sent to output device here
One i/o port is used:
0001 - bit 0 controls whether interrupt timer is enabled (1) or not (0), this is a holdover from a project of kevtris' and can be ignored.
******************************************************************************/
/* Core includes */
#include "emu.h"
#include "cpu/z80/z80.h"
#include "machine/terminal.h"
#include <sstream>
#define TERMINAL_TAG "terminal"
class zexall_state : public driver_device
{
@ -35,18 +32,18 @@ public:
zexall_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_terminal(*this, TERMINAL_TAG),
m_terminal(*this, "terminal"),
m_main_ram(*this, "main_ram")
{
}
DECLARE_READ8_MEMBER( zexall_output_ack_r );
DECLARE_READ8_MEMBER( zexall_output_req_r );
DECLARE_READ8_MEMBER( zexall_output_data_r );
DECLARE_WRITE8_MEMBER( zexall_output_ack_w );
DECLARE_WRITE8_MEMBER( zexall_output_req_w );
DECLARE_WRITE8_MEMBER( zexall_output_data_w );
DECLARE_DRIVER_INIT(zexall);
DECLARE_READ8_MEMBER( output_ack_r );
DECLARE_READ8_MEMBER( output_req_r );
DECLARE_READ8_MEMBER( output_data_r );
DECLARE_WRITE8_MEMBER( output_ack_w );
DECLARE_WRITE8_MEMBER( output_req_w );
DECLARE_WRITE8_MEMBER( output_data_w );
private:
required_device<cpu_device> m_maincpu;
required_device<generic_terminal_device> m_terminal;
@ -55,73 +52,82 @@ private:
uint8_t m_out_req; // byte written to 0xFFFE
uint8_t m_out_req_last; // old value at 0xFFFE before the most recent write
uint8_t m_out_ack; // byte written to 0xFFFC
virtual void machine_start() override;
virtual void machine_reset() override;
std::ostringstream m_outstring;
};
DRIVER_INIT_MEMBER(zexall_state,zexall)
/******************************************************************************
Machine Start/Reset
******************************************************************************/
void zexall_state::machine_start()
{
m_out_ack = 0;
m_out_req = 0;
m_out_req_last = 0;
m_out_data = 0;
// register for savestates
save_item(NAME(m_out_ack));
save_item(NAME(m_out_req));
save_item(NAME(m_out_req_last));
save_item(NAME(m_out_data));
}
void zexall_state::machine_reset()
{
// rom is self-modifying, so need to refresh it on each run
// zerofill
m_out_ack = 0;
m_out_req = 0;
m_out_req_last = 0;
m_out_data = 0;
// program is self-modifying, so need to refresh it on each run
uint8_t *rom = memregion("romcode")->base();
uint8_t *ram = m_main_ram;
/* fill main ram with zexall code */
memcpy(ram, rom, 0x228a);
m_outstring.str("");
memcpy(m_main_ram, rom, 0x228a);
}
READ8_MEMBER( zexall_state::zexall_output_ack_r )
/******************************************************************************
I/O Handlers
******************************************************************************/
READ8_MEMBER( zexall_state::output_ack_r )
{
// spit out the byte in out_byte if out_req is not equal to out_req_last
// spit out the byte in out_byte if out_req is not equal to out_req_last
if (m_out_req != m_out_req_last)
{
m_terminal->write(space,0,m_out_data);
// turn text into a string for logerror
m_outstring.put(char(m_out_data));
if (m_out_data == 0x0a)
{
logerror("%s", m_outstring.str());
m_outstring.str("");
}
m_terminal->write(space, 0, m_out_data);
m_out_req_last = m_out_req;
m_out_ack++;
}
return m_out_ack;
}
WRITE8_MEMBER( zexall_state::zexall_output_ack_w )
WRITE8_MEMBER( zexall_state::output_ack_w )
{
m_out_ack = data;
}
READ8_MEMBER( zexall_state::zexall_output_req_r )
READ8_MEMBER( zexall_state::output_req_r )
{
return m_out_req;
}
WRITE8_MEMBER( zexall_state::zexall_output_req_w )
WRITE8_MEMBER( zexall_state::output_req_w )
{
m_out_req_last = m_out_req;
m_out_req = data;
}
READ8_MEMBER( zexall_state::zexall_output_data_r )
READ8_MEMBER( zexall_state::output_data_r )
{
return m_out_data;
}
WRITE8_MEMBER( zexall_state::zexall_output_data_w )
WRITE8_MEMBER( zexall_state::output_data_w )
{
m_out_data = data;
}
/******************************************************************************
Address Maps
******************************************************************************/
@ -129,40 +135,34 @@ WRITE8_MEMBER( zexall_state::zexall_output_data_w )
static ADDRESS_MAP_START(z80_mem, AS_PROGRAM, 8, zexall_state)
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x0000, 0xfffc) AM_RAM AM_SHARE("main_ram")
AM_RANGE(0xfffd, 0xfffd) AM_READWRITE(zexall_output_ack_r,zexall_output_ack_w)
AM_RANGE(0xfffe, 0xfffe) AM_READWRITE(zexall_output_req_r,zexall_output_req_w)
AM_RANGE(0xffff, 0xffff) AM_READWRITE(zexall_output_data_r,zexall_output_data_w)
ADDRESS_MAP_END
static ADDRESS_MAP_START(z80_io, AS_IO, 8, zexall_state)
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x0001, 0x0001) AM_NOP // really a disable/enable for some sort of interrupt timer on kev's hardware, which is completely irrelevant for the zexall test
AM_RANGE(0xfffd, 0xfffd) AM_READWRITE(output_ack_r,output_ack_w)
AM_RANGE(0xfffe, 0xfffe) AM_READWRITE(output_req_r,output_req_w)
AM_RANGE(0xffff, 0xffff) AM_READWRITE(output_data_r,output_data_w)
ADDRESS_MAP_END
/******************************************************************************
Input Ports
******************************************************************************/
static INPUT_PORTS_START( zexall )
INPUT_PORTS_END
/******************************************************************************
Machine Drivers
******************************************************************************/
static MACHINE_CONFIG_START( zexall )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", Z80, XTAL_3_579545MHz*10)
MCFG_CPU_ADD("maincpu", Z80, XTAL_3_579545MHz)
MCFG_CPU_PROGRAM_MAP(z80_mem)
MCFG_CPU_IO_MAP(z80_io)
MCFG_QUANTUM_TIME(attotime::from_hz(60))
/* video hardware */
MCFG_DEVICE_ADD(TERMINAL_TAG, GENERIC_TERMINAL, 0)
MCFG_DEVICE_ADD("terminal", GENERIC_TERMINAL, 0)
MACHINE_CONFIG_END
/******************************************************************************
ROM Definitions
******************************************************************************/
@ -173,10 +173,9 @@ ROM_START(zexall)
ROM_END
/******************************************************************************
Drivers
******************************************************************************/
// YEAR NAME PARENT COMPAT MACHINE INPUT STATE INIT COMPANY FULLNAME FLAGS
COMP( 2009, zexall, 0, 0, zexall, zexall, zexall_state, zexall, "Frank Cringle & MESSDEV", "ZEXALL Z80 instruction set exerciser (modified for MESS)", MACHINE_NO_SOUND_HW )
COMP( 2009, zexall, 0, 0, zexall, zexall, zexall_state, 0, "Frank Cringle & MESSDEV", "ZEXALL Z80 instruction set exerciser (modified for MESS)", MACHINE_NO_SOUND_HW | MACHINE_SUPPORTS_SAVE )