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(MESS) itt3030: preliminary bankswitching setup using bankdev [R. Belmont]

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This commit is contained in:
R. Belmont 2013-12-06 04:26:55 +00:00
parent 32689882b2
commit c772fe08d8
1 changed files with 82 additions and 6 deletions
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88
src/mess/drivers/itt3030.c
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@ -193,6 +193,7 @@ Beeper Circuit, all ICs shown:
#include "cpu/z80/z80.h"
#include "machine/wd_fdc.h"
#include "machine/bankdev.h"
#include "machine/ram.h"
#include "formats/itt3030_dsk.h"
#include "video/tms9927.h" //Display hardware
#include "sound/beep.h"
@ -207,21 +208,29 @@ public:
itt3030_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_ram(*this, "mainram")
, m_crtc(*this, "crt5027")
, m_48kbank(*this, "lowerbank")
, m_fdc (*this, "fdc")
, m_floppy0(*this, "fdc:0")
, m_floppy1(*this, "fdc:1")
, m_beep(*this, "beeper")
, m_vram(*this, "vram")
{ }
// devices
required_device<cpu_device> m_maincpu;
required_device<ram_device> m_ram;
required_device<crt5027_device> m_crtc;
required_device<address_map_bank_device> m_48kbank;
required_device<fd1791_t> m_fdc;
required_device<floppy_connector> m_floppy0;
required_device<floppy_connector> m_floppy1;
required_device<beep_device> m_beep;
// shared pointers
required_shared_ptr<UINT8> m_vram;
// screen updates
UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
@ -236,11 +245,16 @@ public:
DECLARE_READ8_MEMBER(vsync_r);
DECLARE_READ8_MEMBER(unk2_r);
DECLARE_WRITE8_MEMBER( beep_w );
DECLARE_WRITE8_MEMBER(bank_w);
DECLARE_READ8_MEMBER(bankl_r);
DECLARE_WRITE8_MEMBER(bankl_w);
DECLARE_READ8_MEMBER(bankh_r);
DECLARE_WRITE8_MEMBER(bankh_w);
DECLARE_FLOPPY_FORMATS(itt3030_floppy_formats);
private:
UINT8 m_unk;
UINT8 m_bank;
floppy_image_device *m_floppy;
};
void itt3030_state::video_start()
@ -263,6 +277,45 @@ WRITE8_MEMBER( itt3030_state::beep_w )
m_beep->set_state(data&0x32);
}
WRITE8_MEMBER(itt3030_state::bank_w)
{
int bank;
m_bank = data>>4;
if (data & 1) // bank 8
{
bank = 8;
}
else
{
bank = m_bank >> 1;
}
// printf("bank_w: new value %02x, m_bank %x, bank %x\n", data, m_bank, bank);
m_48kbank->set_bank(bank);
}
READ8_MEMBER(itt3030_state::bankl_r)
{
return m_ram->read(offset);
}
WRITE8_MEMBER(itt3030_state::bankl_w)
{
m_ram->write(offset, data);
}
READ8_MEMBER(itt3030_state::bankh_r)
{
return m_ram->read(((m_bank>>1)*0x10000) + offset + 0xc000);
}
WRITE8_MEMBER(itt3030_state::bankh_w)
{
m_ram->write(((m_bank>>1)*0x10000) + offset + 0xc000, data);
}
UINT32 itt3030_state::screen_update( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
address_space &space = m_maincpu->space(AS_PROGRAM);
@ -271,7 +324,7 @@ UINT32 itt3030_state::screen_update( screen_device &screen, bitmap_ind16 &bitmap
{
for(int x = 0; x < 80; x++ )
{
UINT8 code = space.read_byte(0x3000 + x + y*128);
UINT8 code = m_vram[0x3000 + x + y*128];
drawgfx_opaque(bitmap, cliprect, machine().gfx[0], code , 0, 0,0, x*8,y*16);
}
}
@ -279,12 +332,24 @@ UINT32 itt3030_state::screen_update( screen_device &screen, bitmap_ind16 &bitmap
return 0;
}
// The lower 48K is switchable among the first 48K of each of 8 64K banks numbered 0-7 or "bank 8" which is the internal ROM and VRAM
// The upper 16K is always the top 16K of the selected bank 0-7, which allows bank/bank copies and such
// Port F6 bits 7-5 select banks 0-7, bit 4 enables bank 8
static ADDRESS_MAP_START( itt3030_map, AS_PROGRAM, 8, itt3030_state )
AM_RANGE(0x0000, 0x07ff) AM_ROM AM_REGION("maincpu", 0)
AM_RANGE(0x0800, 0x0fff) AM_ROM AM_REGION("maincpu", 0)
AM_RANGE(0x1000, 0xffff) AM_RAM
AM_RANGE(0x0000, 0xbfff) AM_DEVICE("lowerbank", address_map_bank_device, amap8)
AM_RANGE(0xc000, 0xffff) AM_READWRITE(bankh_r, bankh_w)
ADDRESS_MAP_END
static ADDRESS_MAP_START( lower48_map, AS_PROGRAM, 8, itt3030_state )
AM_RANGE(0x00000, 0x7ffff) AM_READWRITE(bankl_r, bankl_w) // pages 0-7
// AM_RANGE(0x00000, 0x7ffff) AM_DEVREADWRITE("mainram", ram_device, read, write) // should work in theory, but compiler blows up spectacularly?
AM_RANGE(0x80000, 0x807ff) AM_ROM AM_REGION("maincpu", 0) // begin "page 8"
AM_RANGE(0x80800, 0x80fff) AM_ROM AM_REGION("maincpu", 0)
AM_RANGE(0x81000, 0x810ff) AM_RAM AM_MIRROR(0x100) // only 256 bytes, but ROM also clears 11xx?
AM_RANGE(0x83000, 0x83fff) AM_RAM AM_SHARE("vram")
ADDRESS_MAP_END
static ADDRESS_MAP_START( itt3030_io, AS_IO, 8, itt3030_state )
ADDRESS_MAP_GLOBAL_MASK(0xff)
@ -293,7 +358,7 @@ static ADDRESS_MAP_START( itt3030_io, AS_IO, 8, itt3030_state )
AM_RANGE(0x32, 0x32) AM_WRITE(beep_w)
AM_RANGE(0x35, 0x35) AM_READ(vsync_r)
AM_RANGE(0x50, 0x55) AM_DEVREADWRITE("fdc", fd1791_t, read, write)
AM_RANGE(0xf6, 0xf6) AM_WRITE(bank_w)
ADDRESS_MAP_END
static INPUT_PORTS_START( itt3030 )
@ -322,6 +387,8 @@ void itt3030_state::machine_start()
void itt3030_state::machine_reset()
{
m_bank = 1;
m_48kbank->set_bank(8);
}
FLOPPY_FORMATS_MEMBER( itt3030_state::itt3030_floppy_formats )
@ -356,6 +423,11 @@ static MACHINE_CONFIG_START( itt3030, itt3030_state )
MCFG_SCREEN_VISIBLE_AREA(0, 80*8-1, 0, 24*16-1)
/* devices */
MCFG_DEVICE_ADD("lowerbank", ADDRESS_MAP_BANK, 0)
MCFG_DEVICE_PROGRAM_MAP(lower48_map)
MCFG_ADDRESS_MAP_BANK_ENDIANNESS(ENDIANNESS_LITTLE)
MCFG_ADDRESS_MAP_BANK_DATABUS_WIDTH(8)
MCFG_ADDRESS_MAP_BANK_STRIDE(0x10000)
MCFG_DEVICE_ADD("crt5027", CRT5027, XTAL_6MHz)
MCFG_DEVICE_CONFIG(crtc_intf)
MCFG_FD1791x_ADD("fdc", XTAL_20MHz / 20)
@ -368,6 +440,10 @@ static MACHINE_CONFIG_START( itt3030, itt3030_state )
MCFG_PALETTE_LENGTH(2)
MCFG_PALETTE_INIT_OVERRIDE(driver_device, black_and_white)
/* internal ram */
MCFG_RAM_ADD("mainram")
MCFG_RAM_DEFAULT_SIZE("512K")
/* sound hardware */
MCFG_SPEAKER_STANDARD_MONO( "mono" )
MCFG_SOUND_ADD( "beeper", BEEP, 0 )