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video/pc_vga_tseng: implement extended start address register

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This commit is contained in:
angelosa 2024-11-16 15:50:57 +01:00
parent 6908e70132
commit f8458dbb29
3 changed files with 42 additions and 5 deletions
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4
src/devices/bus/isa/svga_tseng.cpp
View File

@ -163,7 +163,7 @@ isa16_svga_et4k_w32i_device::isa16_svga_et4k_w32i_device(const machine_config &m
ROM_START( et4kw32i )
ROM_REGION(0x8000,"vga_rom", 0)
ROM_SYSTEM_BIOS(0, "v800n", "Tseng Version 8.00N 04/28/95")
ROM_SYSTEM_BIOS(0, "v800n", "Tseng Version 8.00N 04/28/95 ISA 06/17/95")
ROMX_LOAD("et4kw32i.vbi", 0x00000, 0x8000, CRC(14542962) SHA1(d5aee7205af8bd1fef0ecf1db2c07308a2b10b17), ROM_BIOS(0) )
ROM_END
@ -189,7 +189,7 @@ void isa16_svga_et4k_w32i_device::device_start()
set_isa_device();
remap(AS_PROGRAM, 0, 0xfffff);
remap(AS_IO, 0, 0x3ff);
remap(AS_IO, 0, 0xffff);
}
void isa16_svga_et4k_w32i_device::device_reset()

37
src/devices/video/pc_vga_tseng.cpp
View File

@ -22,8 +22,8 @@
DEFINE_DEVICE_TYPE(TSENG_VGA, tseng_vga_device, "tseng_vga", "Tseng Labs ET4000AX VGA i/f")
tseng_vga_device::tseng_vga_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: svga_device(mconfig, TSENG_VGA, tag, owner, clock)
tseng_vga_device::tseng_vga_device(const machine_config &mconfig, const char *tag, device_type type, device_t *owner, uint32_t clock)
: svga_device(mconfig, type, tag, owner, clock)
{
m_main_if_space_config = address_space_config("io_regs", ENDIANNESS_LITTLE, 8, 4, 0, address_map_constructor(FUNC(tseng_vga_device::io_3bx_3dx_map), this));
m_crtc_space_config = address_space_config("crtc_regs", ENDIANNESS_LITTLE, 8, 8, 0, address_map_constructor(FUNC(tseng_vga_device::crtc_map), this));
@ -31,6 +31,11 @@ tseng_vga_device::tseng_vga_device(const machine_config &mconfig, const char *ta
m_atc_space_config = address_space_config("attribute_regs", ENDIANNESS_LITTLE, 8, 8, 0, address_map_constructor(FUNC(tseng_vga_device::attribute_map), this));
}
tseng_vga_device::tseng_vga_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: tseng_vga_device(mconfig, tag, TSENG_VGA, owner, clock)
{
}
void tseng_vga_device::device_start()
{
svga_device::device_start();
@ -120,7 +125,23 @@ void tseng_vga_device::crtc_map(address_map &map)
// map(0x30, 0x30) System Segment Map Comparator
// map(0x31, 0x31) General Purpose (& Clock Select 3/4)
// map(0x32, 0x32) RAS/CAS Configuration (RCCONF)
// map(0x33, 0x33) Extended Start Address
/*
* ---- xx-- Cursor address bits 16-17
* ---- --xx Start address bits 16-17
*/
// Extended Start Address
map(0x33, 0x33).lrw8(
NAME([this] (offs_t offset) {
return et4k.crtc_ext_start;
}),
NAME([this] (offs_t offset, u8 data) {
et4k.crtc_ext_start = data;
vga.crtc.start_addr_latch &= ~0x30000;
vga.crtc.start_addr_latch |= ((data & 0x3) << 16);
vga.crtc.cursor_addr &= ~0x30000;
vga.crtc.cursor_addr |= ((data & 0xc) << 14);
})
);
// Auxiliary Control
map(0x34, 0x34).lrw8(
NAME([this] (offs_t offset) {
@ -274,3 +295,13 @@ void tseng_vga_device::mem_w(offs_t offset, uint8_t data)
vga_device::mem_w(offset,data);
}
uint32_t tseng_vga_device::latch_start_addr()
{
// TODO: condition for this (SDD scroll/buffer tests)
if(svga.rgb8_en)
{
return vga.crtc.start_addr_latch << 2;
}
return vga.crtc.start_addr_latch;
}

6
src/devices/video/pc_vga_tseng.h
View File

@ -23,6 +23,8 @@ public:
virtual void mem_w(offs_t offset, uint8_t data) override;
protected:
tseng_vga_device(const machine_config &mconfig, const char *tag, device_type type, device_t *owner, uint32_t clock);
virtual void device_start() override ATTR_COLD;
virtual void io_3bx_3dx_map(address_map &map) override ATTR_COLD;
@ -37,6 +39,8 @@ protected:
virtual void attribute_map(address_map &map) override ATTR_COLD;
virtual void recompute_params() override;
virtual uint32_t latch_start_addr() override;
private:
struct
{
@ -48,11 +52,13 @@ private:
bool ext_reg_ena;
uint8_t misc1;
uint8_t misc2;
uint8_t crtc_ext_start;
}et4k;
};
// device type definition
DECLARE_DEVICE_TYPE(TSENG_VGA, tseng_vga_device)
//DECLARE_DEVICE_TYPE(ET4KW32I_VGA, et4kw32i_vga_device)
#endif // MAME_VIDEO_PC_VGA_TSENG_H