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Merge pull request #2255 from BartmanAbyss/hd6345

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added (partial) correct register mappings to HD6345
This commit is contained in:
R. Belmont 2017-04-25 16:13:35 -04:00 committed by GitHub
commit 15af4432bc
2 changed files with 64 additions and 4 deletions
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60
src/devices/video/mc6845.cpp
View File

@ -1,5 +1,5 @@
// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
// copyright-holders:Wilbert Pol, Bartman/Abyss (HD6345)
/**********************************************************************
Motorola MC6845 and compatible CRT controller emulation
@ -419,6 +419,60 @@ WRITE8_MEMBER( mos8563_device::register_w )
recompute_parameters(false);
}
WRITE8_MEMBER( hd6345_device::address_w )
{
m_register_address_latch = data & 0x3f;
}
READ8_MEMBER( hd6345_device::register_r )
{
uint8_t ret = 0xff;
switch (m_register_address_latch)
{
case 0x0c: ret = m_supports_disp_start_addr_r ? (m_disp_start_addr >> 8) & 0xff : 0; break;
case 0x0d: ret = m_supports_disp_start_addr_r ? (m_disp_start_addr >> 0) & 0xff : 0; break;
case 0x0e: ret = (m_cursor_addr >> 8) & 0xff; break;
case 0x0f: ret = (m_cursor_addr >> 0) & 0xff; break;
case 0x10: ret = (m_light_pen_addr >> 8) & 0xff; m_light_pen_latched = false; break;
case 0x11: ret = (m_light_pen_addr >> 0) & 0xff; m_light_pen_latched = false; break;
// TODO: REST
}
return ret;
}
WRITE8_MEMBER( hd6345_device::register_w )
{
if (LOG) logerror("%s:HD6345 reg 0x%02x = 0x%02x\n", machine().describe_context(), m_register_address_latch, data);
switch (m_register_address_latch)
{
case 0x00: m_horiz_char_total = data & 0xff; break;
case 0x01: m_horiz_disp = data & 0xff; break;
case 0x02: m_horiz_sync_pos = data & 0xff; break;
case 0x03: m_sync_width = data & 0xff; break;
case 0x04: m_vert_char_total = data & 0xff; break;
case 0x05: m_vert_total_adj = data & 0x1f; break;
case 0x06: m_vert_disp = data & 0xff; break;
case 0x07: m_vert_sync_pos = data & 0xff; break;
case 0x08: m_mode_control = data & 0xff; break;
case 0x09: m_max_ras_addr = data & 0x1f; break;
case 0x0a: m_cursor_start_ras = data & 0x7f; break;
case 0x0b: m_cursor_end_ras = data & 0x1f; break;
case 0x0c: m_disp_start_addr = ((data & 0x3f) << 8) | (m_disp_start_addr & 0x00ff); break;
case 0x0d: m_disp_start_addr = ((data & 0xff) << 0) | (m_disp_start_addr & 0xff00); break;
case 0x0e: m_cursor_addr = ((data & 0x3f) << 8) | (m_cursor_addr & 0x00ff); break;
case 0x0f: m_cursor_addr = ((data & 0xff) << 0) | (m_cursor_addr & 0xff00); break;
case 0x10: /* read-only */ break;
case 0x11: /* read-only */ break;
// TODO: rest
}
recompute_parameters(false);
}
inline uint8_t mos8563_device::read_videoram(offs_t offset)
{
@ -533,7 +587,7 @@ void mc6845_device::recompute_parameters(bool postload)
else
visarea.set(0 + m_visarea_adjust_min_x, max_visible_x + m_visarea_adjust_max_x, 0 + m_visarea_adjust_min_y, max_visible_y + m_visarea_adjust_max_y);
if (LOG) logerror("M6845 config screen: HTOTAL: 0x%x VTOTAL: 0x%x MAX_X: 0x%x MAX_Y: 0x%x HSYNC: 0x%x-0x%x VSYNC: 0x%x-0x%x Freq: %ffps\n",
if (LOG) logerror("M6845 config screen: HTOTAL: %d VTOTAL: %d MAX_X: %d MAX_Y: %d HSYNC: %d-%d VSYNC: %d-%d Freq: %ffps\n",
horiz_pix_total, vert_pix_total, max_visible_x, max_visible_y, hsync_on_pos, hsync_off_pos - 1, vsync_on_pos, vsync_off_pos - 1, 1 / ATTOSECONDS_TO_DOUBLE(refresh));
if ( m_screen != nullptr )
@ -1222,7 +1276,7 @@ void hd6345_device::device_start()
m_supports_status_reg_d5 = true;
m_supports_status_reg_d6 = true;
m_supports_status_reg_d7 = true;
m_supports_transparent = true;
//m_supports_transparent = true;
}

8
src/devices/video/mc6845.h
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@ -1,5 +1,5 @@
// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
// copyright-holders:Wilbert Pol, Bartman/Abyss (HD6345)
/**********************************************************************
Motorola MC6845 and compatible CRT controller emulation
@ -395,11 +395,17 @@ protected:
virtual void device_reset() override;
};
// HD6345/HD6445 CRTC-II
// http://bitsavers.informatik.uni-stuttgart.de/pdf/hitachi/_dataBooks/1987_Hitachi_8_16_Bit_Peripheral_LSI_Data_Book.pdf, pp. 99
class hd6345_device : public mc6845_device
{
public:
hd6345_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
DECLARE_WRITE8_MEMBER(address_w);
DECLARE_READ8_MEMBER(register_r);
DECLARE_WRITE8_MEMBER(register_w);
protected:
virtual void device_start() override;
virtual void device_reset() override;