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video/pc_vga_paradise.cpp: fix boot regression with PVGA1A

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This commit is contained in:
angelosa 2023-07-12 18:07:22 +02:00
parent 5e5bd2c06b
commit 04961b2ff5
2 changed files with 29 additions and 8 deletions
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36
src/devices/video/pc_vga_paradise.cpp
View File

@ -77,9 +77,10 @@ void pvga1a_vga_device::device_reset()
m_memory_size = 0;
m_video_control = 0; // Really &= 0x8; at POR according to docs
m_video_select = 0;
m_ega_compatible = false;
m_crtc_lock = 0;
m_ext_gc_unlock = false;
m_ext_gc_view.select(0);
m_ext_gc_view.select(1);
}
uint8_t pvga1a_vga_device::mem_r(offs_t offset)
@ -110,12 +111,28 @@ void pvga1a_vga_device::gc_map(address_map &map)
LOGLOCKED("Attempt to R ext. GC register offset %02x while locked\n", offset + 9);
return 0xff;
})
).unmapw();
m_ext_gc_view[1](0x09, 0x0a).r(FUNC(pvga1a_vga_device::address_offset_r)).unmapw();
m_ext_gc_view[1](0x0b, 0x0b).r(FUNC(pvga1a_vga_device::memory_size_r)).unmapw();
m_ext_gc_view[1](0x0c, 0x0c).r(FUNC(pvga1a_vga_device::video_select_r)).unmapw();
m_ext_gc_view[1](0x0d, 0x0d).r(FUNC(pvga1a_vga_device::crtc_lock_r)).unmapw();
m_ext_gc_view[1](0x0e, 0x0e).r(FUNC(pvga1a_vga_device::video_control_r)).unmapw();
m_ext_gc_view[2](0x09, 0x0e).lr8(
NAME([this] (offs_t offset) {
LOGLOCKED("Attempt to R ext. GC register offset %02x while locked\n", offset + 9);
return 0xff;
})
);
m_ext_gc_view[1](0x09, 0x0a).rw(FUNC(pvga1a_vga_device::address_offset_r), FUNC(pvga1a_vga_device::address_offset_w));
m_ext_gc_view[1](0x0b, 0x0b).rw(FUNC(pvga1a_vga_device::memory_size_r), FUNC(pvga1a_vga_device::memory_size_w));
m_ext_gc_view[1](0x0c, 0x0c).rw(FUNC(pvga1a_vga_device::video_select_r), FUNC(pvga1a_vga_device::video_select_w));
m_ext_gc_view[1](0x0d, 0x0d).rw(FUNC(pvga1a_vga_device::crtc_lock_r), FUNC(pvga1a_vga_device::crtc_lock_w));
m_ext_gc_view[1](0x0e, 0x0e).rw(FUNC(pvga1a_vga_device::video_control_r), FUNC(pvga1a_vga_device::video_control_w));
m_ext_gc_view[2](0x09, 0x0a).w(FUNC(pvga1a_vga_device::address_offset_w));
m_ext_gc_view[2](0x0b, 0x0b).w(FUNC(pvga1a_vga_device::memory_size_w));
m_ext_gc_view[2](0x0c, 0x0c).w(FUNC(pvga1a_vga_device::video_select_w));
m_ext_gc_view[2](0x0d, 0x0d).w(FUNC(pvga1a_vga_device::crtc_lock_w));
m_ext_gc_view[2](0x0e, 0x0e).w(FUNC(pvga1a_vga_device::video_control_w));
m_ext_gc_view[3](0x09, 0x0a).rw(FUNC(pvga1a_vga_device::address_offset_r), FUNC(pvga1a_vga_device::address_offset_w));
m_ext_gc_view[3](0x0b, 0x0b).rw(FUNC(pvga1a_vga_device::memory_size_r), FUNC(pvga1a_vga_device::memory_size_w));
m_ext_gc_view[3](0x0c, 0x0c).rw(FUNC(pvga1a_vga_device::video_select_r), FUNC(pvga1a_vga_device::video_select_w));
m_ext_gc_view[3](0x0d, 0x0d).rw(FUNC(pvga1a_vga_device::crtc_lock_r), FUNC(pvga1a_vga_device::crtc_lock_w));
m_ext_gc_view[3](0x0e, 0x0e).rw(FUNC(pvga1a_vga_device::video_control_r), FUNC(pvga1a_vga_device::video_control_w));
map(0x0f, 0x0f).rw(FUNC(pvga1a_vga_device::ext_gc_status_r), FUNC(pvga1a_vga_device::ext_gc_unlock_w));
}
@ -225,7 +242,7 @@ u8 pvga1a_vga_device::crtc_lock_r(offs_t offset)
void pvga1a_vga_device::crtc_lock_w(offs_t offset, u8 data)
{
LOG("PR3 CRTC lock W\n", data);
LOG("PR3 CRTC lock W %02x\n", data);
m_crtc_lock = data;
}
@ -252,6 +269,9 @@ void pvga1a_vga_device::video_control_w(offs_t offset, u8 data)
LOG("PR4 Video Control W %02x\n", data);
m_video_control = data;
svga.rgb8_en = BIT(data, 0);
m_ega_compatible = bool(BIT(data, 1));
m_ext_gc_view.select(m_ext_gc_unlock << 1 | !m_ega_compatible);
}
/*
@ -271,7 +291,7 @@ void pvga1a_vga_device::ext_gc_unlock_w(offs_t offset, u8 data)
{
m_ext_gc_unlock = (data & 0x7) == 5;
LOGLOCKED("PR5 %s state (%02x)\n", m_ext_gc_unlock ? "unlock" : "lock", data);
m_ext_gc_view.select(m_ext_gc_unlock);
m_ext_gc_view.select(m_ext_gc_unlock << 1 | !m_ega_compatible);
}
/**************************************

1
src/devices/video/pc_vga_paradise.h
View File

@ -45,6 +45,7 @@ private:
u8 m_memory_size = 0;
u8 m_video_control = 0;
bool m_ext_gc_unlock = false;
bool m_ega_compatible = false;
};
class wd90c00_vga_device : public pvga1a_vga_device