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ibm/ibm5550.cpp: identify video format a bit

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This commit is contained in:
angelosa 2023-10-20 00:32:43 +02:00
parent 299447c50f
commit e353be43cd
1 changed files with 59 additions and 9 deletions
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68
src/mame/ibm/ibm5550.cpp
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@ -56,6 +56,7 @@ public:
, m_crtc(*this, "crtc")
, m_screen(*this, "screen")
, m_vram(*this, "vram")
, m_gfxram(*this, "gfxram")
, m_palette(*this, "palette")
{ }
@ -71,6 +72,7 @@ private:
required_device<mc6845_device> m_crtc;
required_device<screen_device> m_screen;
required_shared_ptr<uint16_t> m_vram;
required_shared_ptr<uint16_t> m_gfxram;
required_device<palette_device> m_palette;
void main_map(address_map &map);
@ -81,8 +83,52 @@ private:
u8 m_a0_unk = 0;
};
/*
static const gfx_layout kanji_layout =
{
32, 32,
RGN_FRAC(1,1),
1,
{ 0 },
{ STEP16(0,1), STEP16(16, 16) },
{ STEP16(0,16), STEP16(16*16, 16) },
32*32
};
*/
uint32_t ibm5550_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
const u32 pitch = 82;
bitmap.fill(m_palette->black_pen(), cliprect);
for(int y = 0; y < 24; y++)
{
for(int x = 0; x < pitch; x++)
{
const u16 tile = m_vram[x + y * pitch] & 0x1f;
for (int yi = 0; yi < 32; yi ++)
{
u16 color = m_gfxram[tile * 64 + yi];
for (int xi = 0; xi < 16; xi ++)
{
const int res_x = x * 32 + xi;
const int res_y = y * 32 + yi;
if(cliprect.contains(res_x, res_y))
bitmap.pix(res_y, res_x) = m_palette->pen(BIT(color, 15 - xi) ? 2 : 0);
}
color = m_gfxram[tile * 64 + yi + 32];
for (int xi = 0; xi < 16; xi ++)
{
const int res_x = x * 32 + xi + 16;
const int res_y = y * 32 + yi;
if(cliprect.contains(res_x, res_y))
bitmap.pix(res_y, res_x) = m_palette->pen(BIT(color, 15 - xi) ? 2 : 0);
}
}
}
}
return 0;
}
@ -91,8 +137,8 @@ void ibm5550_state::main_map(address_map &map)
map.unmap_value_high();
map(0x00000, 0x3ffff).ram(); // 256 or 512KB
// POST test $f6 expects that all the blocks between $4c000-$ec000 returns 0xff
map(0xd8000, 0xd8fff).ram().share("vram"); // text VRAM?
map(0xe0000, 0xe0fff).ram(); // attribute VRAM?
map(0xd8000, 0xd8fff).ram().share("gfxram");
map(0xe0000, 0xe0fff).ram().share("vram");
map(0xfc000, 0xfffff).rom().region("ipl", 0);
}
@ -105,6 +151,8 @@ void ibm5550_state::main_io(address_map &map)
// tested later, with bit 6 irq from PIC
// map(0x0040, 0x0047).rw(m_pit, FUNC(pit8253_device::read), FUNC(pit8253_device::write));
// map(0x0060, 0x0060) / map(0x0064, 0x0064) standard XT keyboard
// bit 0 on will punt before testing for $20-$21,
// but will be required on after $4c-$ec RAM holes above
// ... RAM protection?
@ -135,8 +183,11 @@ void ibm5550_state::main_io(address_map &map)
);
// TODO: not right, definitely an address/data of some sort (extended regs?)
map(0x3d0, 0x3d0).rw(m_crtc, FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w));
map(0x3d1, 0x3d1).rw(m_crtc, FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
//map(0x3d0, 0x3d0).rw(m_crtc, FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w));
//map(0x3d1, 0x3d1).rw(m_crtc, FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
// TODO: vblank
//map(0x3da, 0x3da).lr8(
}
static INPUT_PORTS_START( ibm5550 )
@ -184,11 +235,11 @@ void ibm5550_state::ibm5550(machine_config &config)
// JDA display board
// CX0-043C @ 40 MHz
// HD46505SP-2
HD6845S(config, m_crtc, XTAL(40'000'000));
// HD46505SP-2, unknown pixel clock
HD6845S(config, m_crtc, XTAL(40'000'000) / 10);
m_crtc->set_screen(m_screen);
// m_crtc->set_show_border_area(true);
m_crtc->set_char_width(8);
m_crtc->set_char_width(16);
// IBM6343870 / MN50015SPG
// IBM6343869 / MN50007SPF
@ -204,8 +255,6 @@ void ibm5550_state::ibm5550(machine_config &config)
PALETTE(config, m_palette, palette_device::MONOCHROME_HIGHLIGHT);
// ibm5160_mb_device &mb(IBM5160_MOTHERBOARD(config, "mb"));
// mb.set_cputag(m_maincpu);
// mb.int_callback().set_inputline(m_maincpu, 0);
@ -233,6 +282,7 @@ ROM_START( ibm5550 )
ROM_REGION16_LE(0x4000, "ipl", 0)
ROM_LOAD("ipl5550.rom", 0x0000, 0x4000, CRC(40cf34c9) SHA1(d41f77fdfa787b0e97ed311e1c084b8699a5b197))
// integrated for later models
ROM_REGION(0x20000, "kanji", ROMREGION_ERASEFF)
ROM_LOAD("chargen.rom", 0x00000, 0x20000, NO_DUMP )
ROM_END