(MESS) c128: MMU fixes. (nw)

This commit is contained in:
Curt Coder 2012-10-15 14:03:10 +00:00
parent b84f06da74
commit ab1a064e29
2 changed files with 171 additions and 129 deletions

View File

@ -55,7 +55,7 @@ enum
#define CR_ROM_LO BIT(m_reg[CR], 1)
#define CR_ROM_MID ((m_reg[CR] >> 2) & 0x03)
#define CR_ROM_HI ((m_reg[CR] >> 4) & 0x03)
#define CR_RAM ((m_reg[CR] >> 6) & 0x03)
#define CR_A16 BIT(m_reg[CR], 6)
// mode configuration register
@ -161,13 +161,15 @@ void mos8722_device::device_start()
void mos8722_device::device_reset()
{
for (int i = 0; i < 12; i++)
for (int i = 0; i < 16; i++)
{
m_reg[i] = 0;
}
m_p0l_written = false;
m_p1l_written = false;
m_reg[P1L] = 0x01;
m_p0h_latch = 0;
m_p1h_latch = 0;
m_out_z80en_func(MCR_8500);
m_out_fsdir_func(MCR_FSDIR);
@ -180,32 +182,44 @@ void mos8722_device::device_reset()
UINT8 mos8722_device::read(offs_t offset, UINT8 data)
{
if (!MCR_C64)
if (MCR_C64) return data;
if (!CR_IO && offset >= 0xd500 && offset < 0xd50c)
{
if (!CR_IO && offset >= 0xd500 && offset < 0xd50c)
switch (offset & 0x0f)
{
switch (offset & 0x0f)
{
case MCR:
data = m_reg[MCR] & 0x49;
case CR:
data = m_reg[CR] | 0x80;
break;
data |= m_in_game_func() << 4;
data |= m_in_exrom_func() << 5;
data |= m_in_sense40_func() << 7;
break;
case MCR:
data = m_reg[MCR] | 0x06;
case VR:
data = 0x20;
break;
data &= ((m_in_game_func() << 4) | ~0x10);
data &= ((m_in_exrom_func() << 5) | ~0x20);
data &= ((m_in_sense40_func() << 7) | ~0x80);
break;
default:
data = m_reg[offset & 0x0f];
break;
}
case VR:
data = 0x20;
break;
default:
data = m_reg[offset & 0x0f];
break;
}
else if (offset == 0xff00)
}
else if (offset >= 0xff00 && offset < 0xff05)
{
switch (offset & 0x0f)
{
return m_reg[CR];
case CR:
data = m_reg[CR] | 0x80;
break;
default:
data = m_reg[offset & 0x0f];
break;
}
}
@ -219,52 +233,76 @@ UINT8 mos8722_device::read(offs_t offset, UINT8 data)
WRITE8_MEMBER( mos8722_device::write )
{
if (!MCR_C64)
if (MCR_C64) return;
if (!CR_IO && offset >= 0xd500 && offset < 0xd50c)
{
if (!CR_IO && offset >= 0xd500 && offset < 0xd50c)
if (LOG) logerror("MOS8722 '%s' Write %01x : %02x\n", tag(), offset & 0x0f, data);
switch (offset & 0x0f)
{
if (LOG) logerror("MOS8722 '%s' Write %01x : %02x\n", tag(), offset & 0x0f, data);
case CR:
m_reg[CR] = data & 0x7f;
break;
m_reg[offset & 0x0f] = data;
case PCRA:
case PCRB:
case PCRC:
case PCRD:
m_reg[offset & 0x0f] = data & 0x7f;
break;
switch (offset & 0x0f)
{
case MCR:
m_out_z80en_func(MCR_8500);
m_out_fsdir_func(MCR_FSDIR);
break;
case MCR:
{
int _8500 = MCR_8500;
int fsdir = MCR_FSDIR;
case P0L:
m_p0l_written = true;
break;
case P0H:
m_p0l_written = false;
break;
case P1L:
m_p1l_written = true;
break;
case P1H:
m_p1l_written = false;
break;
}
m_reg[MCR] = data;
if (_8500 != MCR_8500) m_out_z80en_func(MCR_8500);
if (fsdir != MCR_FSDIR) m_out_fsdir_func(MCR_FSDIR);
break;
}
else if (offset >= 0xff00 && offset < 0xff05)
case RCR:
m_reg[RCR] = data & 0x4f;
break;
case P0L:
m_reg[P0L] = data;
m_reg[P0H] = m_p0h_latch;
break;
case P0H:
m_p0h_latch = data & 0x01;
break;
case P1L:
m_reg[P1L] = data;
m_reg[P1H] = m_p1h_latch;
break;
case P1H:
m_p1h_latch = data & 0x01;
break;
default:
m_reg[offset & 0x0f] = data;
}
}
else if (offset >= 0xff00 && offset < 0xff05)
{
if (LOG) logerror("MOS8722 '%s' Write %01x : %02x\n", tag(), offset & 0x0f, data);
switch (offset & 0x0f)
{
if (LOG) logerror("MOS8722 '%s' Write %01x : %02x\n", tag(), offset & 0x0f, data);
case CR:
m_reg[CR] = data & 0x7f;
break;
switch (offset & 0x0f)
{
case CR:
m_reg[CR] = data;
break;
default:
m_reg[CR] = m_reg[offset & 0x0f];
break;
}
default:
m_reg[CR] = m_reg[offset & 0x0f];
break;
}
}
}
@ -286,100 +324,104 @@ READ_LINE_MEMBER( mos8722_device::fsdir_r )
offs_t mos8722_device::ta_r(offs_t offset, int aec, int *ms0, int *ms1, int *ms2, int *ms3, int *cas0, int *cas1)
{
offs_t ta = offset & 0xff00;
offs_t ta;
if (!aec)
*ms0 = 1;
*ms1 = 1;
*ms2 = CR_IO;
*ms3 = !MCR_C64;
if (aec)
{
ta = 0xf000 | (offset & 0xf00);
}
// CPU access
ta = offset & 0xff00;
if (!MCR_C64)
{
*ms0 = 1;
*ms1 = 1;
*ms2 = CR_IO;
*cas0 = CR_A16;
*cas1 = !*cas0;
if (offset < 0x1000 && !MCR_8500)
if (!MCR_C64)
{
ta = 0xd000 | (offset & 0xf00);
*ms0 = 0;
*ms1 = 0;
}
else if (offset >= 0x4000 && offset < 0x8000)
{
*ms0 = CR_ROM_LO;
*ms1 = CR_ROM_LO;
}
else if (offset >= 0x8000 && offset < 0xc000)
{
*ms0 = BIT(CR_ROM_MID, 0);
*ms1 = BIT(CR_ROM_MID, 1);
}
else if (offset >= 0xc000)
{
*ms0 = BIT(CR_ROM_HI, 0);
*ms1 = BIT(CR_ROM_HI, 1);
}
if (*ms0 == 1 && *ms1 == 1)
{
if (aec)
if (offset >= 0xff00 && offset < 0xff05)
{
*cas0 = BIT(CR_RAM, 0);
*cas1 = BIT(CR_RAM, 1);
// MMU registers
*cas0 = 1;
*cas1 = 1;
}
else if (!MCR_8500 && !CR_A16 && offset < 0x1000)
{
// Z80 ROM
ta = 0xd000 | (offset & 0xf00);
*ms0 = 0;
*ms1 = 0;
}
else
{
if (offset < 0x0100)
{
if (m_p0l_written && m_reg[P0L])
{
ta = m_reg[P0L] << 8;
// page 0 pointer
ta = m_reg[P0L] << 8;
*cas0 = P0H_A16 ? 1 : 0;
*cas1 = P0H_A16 ? 0 : 1;
}
*cas0 = P0H_A16;
*cas1 = !*cas0;
}
else if (offset < 0x0200)
{
if (m_p1l_written && m_reg[P1L])
{
ta = m_reg[P1L] << 8;
// page 1 pointer
ta = m_reg[P1L] << 8;
*cas0 = P1H_A16 ? 1 : 0;
*cas1 = P1H_A16 ? 0 : 1;
*cas0 = P1H_A16;
*cas1 = !*cas0;
}
else if (offset >= 0x4000 && offset < 0x8000)
{
// low ROM
*ms0 = CR_ROM_LO;
*ms1 = CR_ROM_LO;
}
else if (offset >= 0x8000 && offset < 0xc000)
{
// middle ROM
*ms0 = BIT(CR_ROM_MID, 0);
*ms1 = BIT(CR_ROM_MID, 1);
}
else if (offset >= 0xc000)
{
// high ROM
*ms0 = BIT(CR_ROM_HI, 0);
*ms1 = BIT(CR_ROM_HI, 1);
}
if (*ms0 && *ms1)
{
if ((offset >> 8) == m_reg[P0L])
{
ta = 0x0000;
}
else if ((offset >> 8) == m_reg[P1L])
{
ta = 0x0100;
}
}
if ((RCR_BOTTOM && offset < RCR_BOTTOM_ADDRESS[RCR_SHARE]) ||
(RCR_TOP && offset >= RCR_TOP_ADDRESS[RCR_SHARE]))
{
// RAM sharing
*cas0 = 0;
*cas1 = 1;
*cas1 = !*cas0;
}
}
else
{
*cas0 = RCR_VA16 ? 1 : 0;
*cas1 = RCR_VA16 ? 0 : 1;
}
}
else
{
*cas0 = 1;
*cas1 = 1;
}
}
else
{
*ms0 = 1;
*ms1 = 1;
*ms2 = 1;
// VIC access
ta = 0xf000 | (offset & 0xf00);
*cas0 = 0;
*cas1 = 1;
*cas0 = RCR_VA16;
*cas1 = !*cas0;
}
*ms3 = !MCR_C64;
return ta;
}

View File

@ -102,10 +102,10 @@ private:
devcb_resolved_read_line m_in_exrom_func;
devcb_resolved_read_line m_in_sense40_func;
UINT8 m_reg[12];
UINT8 m_reg[16];
bool m_p0l_written;
bool m_p1l_written;
UINT8 m_p0h_latch;
UINT8 m_p1h_latch;
};