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video/pc_vga_paradise.cpp: bank bit 7 is actually used by Win 95 in 800x600 res

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This commit is contained in:
angelosa 2023-07-10 02:30:32 +02:00
parent a8d33279b8
commit 0cd0dde86a
2 changed files with 4 additions and 3 deletions
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2
src/devices/bus/isa/svga_paradise.cpp
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@ -294,7 +294,7 @@ void isa16_wd90c11_lr_device::device_add_mconfig(machine_config &config)
WD90C11A(config, m_vga, 0);
m_vga->set_screen("screen");
// 512KB (+ option for 1MB? Verify with interlace)
m_vga->set_vram_size(0x80000);
m_vga->set_vram_size(0x100000);
}
void isa16_wd90c11_lr_device::io_isa_map(address_map &map)

5
src/devices/video/pc_vga_paradise.cpp
View File

@ -123,6 +123,7 @@ void pvga1a_vga_device::gc_map(address_map &map)
* [0x09] PR0A Address Offset A
* [0x0a] PR0B Address Offset B
*
* x--- ---- <reserved> according to docs, Win 95 uses this in 800x600 modes for systray
* -xxx xxxx bank selects, in 4KB units
*/
u8 pvga1a_vga_device::address_offset_r(offs_t offset)
@ -130,7 +131,7 @@ u8 pvga1a_vga_device::address_offset_r(offs_t offset)
if (!offset)
{
LOGBANK("PR0A read Address Offset A\n");
return svga.bank_w & 0x7f;
return svga.bank_w & 0xff;
}
// Address Offset B, TBD
LOGBANK("PR0A read Address Offset B\n");
@ -142,7 +143,7 @@ void pvga1a_vga_device::address_offset_w(offs_t offset, u8 data)
if (!offset)
{
LOG("PR0A write Address Offset A %02x\n", data);
svga.bank_w = data & 0x7f;
svga.bank_w = data & 0xff;
}
else
{