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hds200: Slightly better SCN2674 hookup

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This commit is contained in:
Dirk Best 2021-12-14 13:48:58 +01:00
parent 1835f9b1a8
commit 221fc74515
1 changed files with 28 additions and 13 deletions
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41
src/mame/drivers/hds200.cpp
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@ -86,9 +86,12 @@ private:
required_shared_ptr<uint8_t> m_vram;
required_memory_bank m_rombank;
void rowbuffer_map(address_map &map);
uint8_t attr_r(offs_t offset);
void attrram_map(address_map &map);
uint8_t char_r(offs_t offset);
void charram_map(address_map &map);
SCN2674_DRAW_CHARACTER_MEMBER(draw_character);
uint8_t avdc_videoram_r(offs_t offset);
uint8_t dma_mreq_r(offs_t offset);
void dma_mreq_w(offs_t offset, uint8_t data);
@ -130,10 +133,28 @@ void hds200_state::io_map(address_map &map)
// VIDEO EMULATION
//**************************************************************************
void hds200_state::rowbuffer_map(address_map &map)
uint8_t hds200_state::attr_r(offs_t offset)
{
map.global_mask(0xff);
map(0x00, 0xff).ram();
offs_t addr = ((offset << 1) + 0) & 0x7ff;
//logerror("attr_r %04x -> %04x = %02x\n", offset, addr, m_vram[addr]);
return m_vram[addr];
}
void hds200_state::attrram_map(address_map &map)
{
map(0x0000, 0xffff).r(FUNC(hds200_state::attr_r));
}
uint8_t hds200_state::char_r(offs_t offset)
{
offs_t addr = ((offset << 1) + 1) & 0x7ff;
//logerror("char_r %04x -> %04x = %02x\n", offset, addr, m_vram[addr]);
return m_vram[addr];
}
void hds200_state::charram_map(address_map &map)
{
map(0x0000, 0xffff).r(FUNC(hds200_state::char_r));
}
SCN2674_DRAW_CHARACTER_MEMBER( hds200_state::draw_character )
@ -150,12 +171,6 @@ SCN2674_DRAW_CHARACTER_MEMBER( hds200_state::draw_character )
bitmap.pix(y, x + i) = BIT(data, 8 - i) ? fg : bg;
}
uint8_t hds200_state::avdc_videoram_r(offs_t offset)
{
logerror("avdc_videoram_r %04x = %02x\n", offset, m_vram[offset & 0x7ff]);
return m_vram[offset & 0x7ff];
}
static const gfx_layout char_layout =
{
8,16,
@ -264,11 +279,11 @@ void hds200_state::hds200(machine_config &config)
SCN2674(config, m_avdc, 22.680_MHz_XTAL / 9);
m_avdc->intr_callback().set("irqs", FUNC(input_merger_device::in_w<0>));
m_avdc->mbc_callback().set(FUNC(hds200_state::nmi_w));
m_avdc->set_addrmap(0, &hds200_state::rowbuffer_map);
m_avdc->set_addrmap(0, &hds200_state::charram_map);
m_avdc->set_addrmap(1, &hds200_state::attrram_map);
m_avdc->set_character_width(9);
m_avdc->set_screen("screen");
m_avdc->set_display_callback(FUNC(hds200_state::draw_character));
m_avdc->mbc_char_callback().set(FUNC(hds200_state::avdc_videoram_r));
SCN2681(config, m_duart[0], 3.6864_MHz_XTAL);
m_duart[0]->irq_cb().set("irqs", FUNC(input_merger_device::in_w<1>));