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ti85: use direct update handler to remove boot memory mapping hacks

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This allows the flash calculators to properly reset pc to 0x0000 instead
of 0x8000 and properly reset all memory banks to page 0x00.
This commit is contained in:
Jon Sturm 2014-10-27 18:50:42 -05:00
parent 8da3b4f1ef
commit 6f99dba425
2 changed files with 27 additions and 27 deletions
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3
src/mess/includes/ti85.h
View File

@ -86,10 +86,10 @@ public:
UINT8 m_ON_interrupt_status;
UINT8 m_ON_pressed;
UINT8 m_flash_unlocked;
UINT8 m_ti8x_memory_page_0;
UINT8 m_ti8x_memory_page_1;
UINT8 m_ti8x_memory_page_2;
UINT8 m_ti8x_memory_page_3;
bool m_booting;
UINT8 m_LCD_mask;
UINT8 m_power_mode;
UINT8 m_cpu_speed;
@ -217,6 +217,7 @@ public:
void ti85_setup_snapshot (UINT8 * data);
void ti86_setup_snapshot (UINT8 * data);
DECLARE_SNAPSHOT_LOAD_MEMBER( ti8x );
DECLARE_DIRECT_UPDATE_MEMBER( ti83p_direct_update_handler );
ti83pse_timer m_ctimer[3];

51
src/mess/machine/ti85.c
View File

@ -154,7 +154,7 @@ void ti85_state::update_ti83p_memory ()
{
//address_space &space = m_maincpu->space(AS_PROGRAM);
m_membank1->set_bank(0); //Always flash page 0, well allmost
m_membank1->set_bank(m_booting ? 0x1f : 0); //Always flash page 0, well allmost
if (m_ti83p_port4 & 1)
{
@ -182,7 +182,7 @@ void ti85_state::update_ti83pse_memory ()
{
//address_space &space = m_maincpu->space(AS_PROGRAM);
m_membank1->set_bank(m_ti8x_memory_page_0);
m_membank1->set_bank(m_booting ? (m_model==TI84P ? 0x3f : 0x7f) : 0);
if (m_ti83p_port4 & 1)
{
@ -273,30 +273,32 @@ MACHINE_RESET_MEMBER(ti85_state,ti85)
m_PCR = 0xc0;
}
DIRECT_UPDATE_MEMBER(ti85_state::ti83p_direct_update_handler)
{
if (m_booting)
{
if (((m_ti83p_port4 & 1) && (address >= 0x4000 && address < 0xc000)) || (address >= 0x4000 && address < 0x8000))
{
m_booting = false;
update_ti83p_memory();
}
}
return address;
}
MACHINE_RESET_MEMBER(ti85_state,ti83p)
{
m_red_out = 0x00;
m_white_out = 0x00;
m_PCR = 0xc0;
m_ti8x_memory_page_0 = 0;//0x1f;
if (m_model == TI83P)
{
m_ti8x_memory_page_1 = 0x1f;
}
else if (m_model == TI84P)
{
m_ti8x_memory_page_1 = 0x3f;
}
else
{
m_ti8x_memory_page_1 = 0x7f;
}
m_ti8x_memory_page_1 = 0;
m_ti8x_memory_page_2 = 0;
m_ti8x_memory_page_3 = 0;
m_ti83p_port4 = 1;
m_booting = true;
if (m_model == TI83P)
{
update_ti83p_memory();
@ -305,8 +307,6 @@ MACHINE_RESET_MEMBER(ti85_state,ti83p)
{
update_ti83pse_memory();
}
m_maincpu->set_pc(0x8000);
}
MACHINE_START_MEMBER(ti85_state,ti83p)
@ -314,14 +314,14 @@ MACHINE_START_MEMBER(ti85_state,ti83p)
m_model = TI83P;
//address_space &space = m_maincpu->space(AS_PROGRAM);
//m_bios = memregion("flash")->base();
m_maincpu->space(AS_PROGRAM).set_direct_update_handler(direct_update_delegate(FUNC(ti85_state::ti83p_direct_update_handler), this));
m_timer_interrupt_mask = 0;
m_timer_interrupt_status = 0;
m_ON_interrupt_mask = 0;
m_ON_interrupt_status = 0;
m_ON_pressed = 0;
m_ti8x_memory_page_0 = 0;//0x1f;
m_ti8x_memory_page_1 = 0x1f;
m_ti8x_memory_page_1 = 0;
m_ti8x_memory_page_2 = 0;
m_ti8x_memory_page_3 = 0;
m_LCD_memory_base = 0;
@ -334,8 +334,9 @@ MACHINE_START_MEMBER(ti85_state,ti83p)
m_ti83p_port4 = 1;
m_flash_unlocked = 0;
m_booting = true;
ti85_state::update_ti83p_memory();
m_maincpu->set_pc(0x8000); //this is a hack due to incomplete memory mapping emulation
machine().scheduler().timer_pulse(attotime::from_hz(256), timer_expired_delegate(FUNC(ti85_state::ti83_timer1_callback),this));
@ -345,11 +346,11 @@ MACHINE_START_MEMBER(ti85_state,ti83p)
/* save states and debugging */
save_item(NAME(m_timer_interrupt_status));
save_item(NAME(m_timer_interrupt_mask));
save_item(NAME(m_ti8x_memory_page_0));
save_item(NAME(m_ti8x_memory_page_1));
save_item(NAME(m_ti8x_memory_page_2));
save_item(NAME(m_ti8x_memory_page_3));
save_item(NAME(m_ti83p_port4));
save_item(NAME(m_booting));
}
void ti85_state::ti8xpse_init_common()
@ -363,8 +364,7 @@ void ti85_state::ti8xpse_init_common()
m_ON_interrupt_mask = 0;
m_ON_interrupt_status = 0;
m_ON_pressed = 0;
m_ti8x_memory_page_0 = 00;//0x7f;
m_ti8x_memory_page_1 = (m_model != TI84P ) ? 0x7f : 0x3f ;
m_ti8x_memory_page_1 = 0;
m_ti8x_memory_page_2 = 0;
m_ti8x_memory_page_3 = 0;
m_LCD_memory_base = 0;
@ -378,7 +378,7 @@ void ti85_state::ti8xpse_init_common()
m_flash_unlocked = 0;
ti85_state::update_ti83pse_memory();
m_maincpu->set_pc(0x8000);//same as above, hack to work around incomplete memory mapping emulation
m_maincpu->space(AS_PROGRAM).set_direct_update_handler(direct_update_delegate(FUNC(ti85_state::ti83p_direct_update_handler), this));
machine().scheduler().timer_pulse(attotime::from_hz(256), timer_expired_delegate(FUNC(ti85_state::ti83_timer1_callback),this));
@ -391,7 +391,6 @@ void ti85_state::ti8xpse_init_common()
/* save states and debugging */
save_item(NAME(m_ctimer_interrupt_status));
save_item(NAME(m_timer_interrupt_status));
save_item(NAME(m_ti8x_memory_page_0));
save_item(NAME(m_ti8x_memory_page_1));
save_item(NAME(m_ti8x_memory_page_2));
save_item(NAME(m_ti8x_memory_page_3));