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looking at ttchamp backupram (via PIC?) not yet working (nw)

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This commit is contained in:
mamehaze 2015-03-27 01:43:24 +00:00
parent c165d011b5
commit e9e40f1d56
1 changed files with 103 additions and 4 deletions
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107
src/mame/drivers/ttchamp.c
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@ -53,17 +53,21 @@ Dumped by tirino73
- works in a very similar way to 'Spider' (twins.c)
including the blitter (seems to be doubled up hardware tho, twice as many layers?)
- PIC is not for sound, what is is for?
- eeprom? (I don't see one, maybe PIC is used for settings?)
- Convert this to a blitter device, and share it with twins.c
- A bunch of spurious RAM writes to ROM area (genuine bug? left-overs?)
Notes
I think the PIC is used to interface with battry backed RAM instead of an EEPROM,
we currently attempt to simulate this as the PIC is read protected.
*/
#include "emu.h"
#include "cpu/nec/nec.h"
#include "sound/okim6295.h"
#include "machine/nvram.h"
class ttchamp_state : public driver_device
{
@ -87,6 +91,8 @@ public:
DECLARE_READ16_MEMBER(port1e_r);
DECLARE_READ16_MEMBER(ttchamp_pic_r);
DECLARE_WRITE16_MEMBER(ttchamp_pic_w);
UINT16 m_port10;
UINT8 m_rombank;
@ -99,10 +105,26 @@ public:
DECLARE_WRITE16_MEMBER(ttchamp_mem_w);
UINT16 m_videoram0[0x10000 / 2];
// UINT16 m_videoram1[0x10000 / 2];
UINT16 m_videoram2[0x10000 / 2];
enum picmode
{
PIC_IDLE = 0,
PIC_SET_READADDRESS = 1,
PIC_SET_WRITEADDRESS = 2,
PIC_SET_WRITELATCH = 3,
PIC_SET_READLATCH = 4,
} picmodex;
int m_pic_readaddr;
int m_pic_writeaddr;
int m_pic_latched;
int m_pic_writelatched;
UINT8* m_bakram;
UINT16 m_mainram[0x10000 / 2];
@ -125,6 +147,12 @@ void ttchamp_state::machine_start()
{
m_rom16 = (UINT16*)memregion("maincpu")->base();
m_rom8 = memregion("maincpu")->base();
picmodex = PIC_IDLE;
m_bakram = auto_alloc_array(machine(), UINT8, 0x100);
machine().device<nvram_device>("backram")->set_base(m_bakram, 0x100);
}
void ttchamp_state::video_start()
@ -231,6 +259,75 @@ WRITE16_MEMBER(ttchamp_state::paldat_w)
m_palette->set_pen_color(m_paloff & 0x3ff,pal5bit(data>>0),pal5bit(data>>5),pal5bit(data>>10));
}
READ16_MEMBER(ttchamp_state::ttchamp_pic_r)
{
// printf("%06x: read from PIC (%04x)\n", space.device().safe_pc(),mem_mask);
if (picmodex == PIC_SET_READLATCH)
{
printf("read data %02x from %02x\n", m_pic_latched, m_pic_readaddr);
picmodex = PIC_IDLE;
return m_pic_latched;
}
return 0x00;
}
WRITE16_MEMBER(ttchamp_state::ttchamp_pic_w)
{
// printf("%06x: write to PIC %04x (%04x) (%d)\n", space.device().safe_pc(),data,mem_mask, picmodex);
if (picmodex == PIC_IDLE)
{
if (data == 0x11)
{
picmodex = PIC_SET_READADDRESS;
// printf("state = SET_READADDRESS\n");
}
else if (data == 0x12)
{
picmodex = PIC_SET_WRITELATCH;
// printf("latch write data.. \n" );
}
else if (data == 0x20)
{
picmodex = PIC_SET_WRITEADDRESS;
// printf("state = PIC_SET_WRITEADDRESS\n");
}
else if (data == 0x21) // write latched data
{
picmodex = PIC_IDLE;
m_bakram[m_pic_writeaddr] = m_pic_writelatched;
printf("wrote %02x to %02x\n", m_pic_writelatched, m_pic_writeaddr);
}
else if (data == 0x22) // next data to latch
{
m_pic_latched = m_bakram[m_pic_readaddr];
// printf("latch read data %02x from %02x\n",m_pic_latched, m_pic_readaddr );
picmodex = PIC_SET_READLATCH; // waiting to read...
}
else
{
// printf("unknown\n");
}
}
else if (picmodex == PIC_SET_READADDRESS)
{
m_pic_readaddr = data;
picmodex = PIC_IDLE;
}
else if (picmodex == PIC_SET_WRITEADDRESS)
{
m_pic_writeaddr = data;
picmodex = PIC_IDLE;
}
else if (picmodex == PIC_SET_WRITELATCH)
{
m_pic_writelatched = data;
picmodex = PIC_IDLE;
}
}
READ16_MEMBER(ttchamp_state::ttchamp_mem_r)
{
@ -440,7 +537,7 @@ static ADDRESS_MAP_START( ttchamp_io, AS_IO, 16, ttchamp_state )
AM_RANGE(0x0020, 0x0021) AM_WRITE(port20_w)
// AM_RANGE(0x0034, 0x0035) AM_READ(peno_rand) AM_WRITENOP // eeprom (PIC?) / settings?
AM_RANGE(0x0034, 0x0035) AM_READWRITE(ttchamp_pic_r, ttchamp_pic_w)
AM_RANGE(0x0062, 0x0063) AM_WRITE(port62_w)
@ -535,6 +632,8 @@ static MACHINE_CONFIG_START( ttchamp, ttchamp_state )
MCFG_SCREEN_PALETTE("palette")
MCFG_PALETTE_ADD("palette", 0x400)
MCFG_NVRAM_ADD_0FILL("backram")
MCFG_SPEAKER_STANDARD_MONO("mono")