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coco3: move GIME logic into gime.cpp (#8085)

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tim lindner 2021-05-22 05:01:01 -07:00 committed by GitHub
parent 6b63e81d7c
commit ae08a2f65d
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4 changed files with 22 additions and 39 deletions
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4
src/mame/includes/coco3.h
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@ -50,10 +50,6 @@ public:
void coco3_mem(address_map &map);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
virtual void update_cart_base(uint8_t *cart_base) override;
// miscellaneous

36
src/mame/machine/coco3.cpp
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@ -46,34 +46,6 @@
#include "emu.h"
#include "includes/coco3.h"
//-------------------------------------------------
// device_start
//-------------------------------------------------
void coco3_state::device_start()
{
// call parent device_start
coco_state::device_start();
// save state support
save_item(NAME(m_pia1b_control_register));
}
//-------------------------------------------------
// device_reset
//-------------------------------------------------
void coco3_state::device_reset()
{
/* call parent device_start */
coco_state::device_reset();
/* reset state */
m_pia1b_control_register = 0;
}
//-------------------------------------------------
// ff20_write
//-------------------------------------------------
@ -82,12 +54,8 @@ void coco3_state::ff20_write(offs_t offset, uint8_t data)
{
coco_state::ff20_write(offset, data);
if (offset == 0x03)
m_pia1b_control_register = data;
/* only pass ff22 to gime if the data register is addressed */
if (offset == 0x02 && ((m_pia1b_control_register & 0x04) == 0x04))
m_gime->ff22_write(data);
/* The GIME monitors writes to the PIA to simulate a VDG */
m_gime->pia_write(offset, data);
}

18
src/mame/video/gime.cpp
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@ -184,6 +184,7 @@ void gime_device::device_start(void)
save_item(NAME(m_mmu));
save_item(NAME(m_sam_state));
save_item(NAME(m_ff22_value));
save_item(NAME(m_ff23_value));
save_item(NAME(m_interrupt_value));
save_item(NAME(m_irq));
save_item(NAME(m_firq));
@ -302,6 +303,7 @@ void gime_device::device_reset(void)
m_displayed_rgb = false;
m_ff22_value = 0;
m_ff23_value = 0;
update_memory();
reset_timer();
@ -611,6 +613,22 @@ uint8_t *gime_device::memory_pointer(uint32_t address)
//-------------------------------------------------
// pia_write - observe writes to pia 1
//-------------------------------------------------
void gime_device::pia_write(offs_t offset, uint8_t data)
{
if (offset == 0x03)
m_ff23_value = data;
/* only cache writes to $FF22 if the data register is addressed */
if (offset == 0x02 && ((m_ff23_value & 0x04) == 0x04))
m_ff22_value = data;
}
//-------------------------------------------------
// update_cart_rom
//-------------------------------------------------

3
src/mame/video/gime.h
View File

@ -40,7 +40,7 @@ public:
bool spare_chip_select_enabled(void) { return m_gime_registers[0] & 0x04 ? true : false; }
// the GIME seems to intercept writes to $FF22 (not precisely sure how)
void ff22_write(uint8_t data) { m_ff22_value = data; }
void pia_write(offs_t offset, uint8_t data);
// updates the cart ROM
void update_cart_rom(void);
@ -141,6 +141,7 @@ protected:
uint8_t m_gime_registers[16];
uint8_t m_mmu[16];
uint8_t m_ff22_value;
uint8_t m_ff23_value;
uint8_t m_interrupt_value;
uint8_t m_irq;
uint8_t m_firq;