Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-22 16:31:49 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

act5a: Improve attribute latching (nw)

Browse Source
This commit is contained in:
AJR 2018-08-16 17:26:20 -04:00
parent feeb72af5a
commit 84a1500026
1 changed files with 11 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/mame/drivers/microterm_f8.cpp
View File

@ -77,6 +77,7 @@ private:
u8 m_port00;
u8 m_keylatch;
u8 m_attrlatch;
u8 m_scroll;
std::unique_ptr<u16[]> m_vram;
@ -86,6 +87,7 @@ private:
void microterm_f8_state::machine_start()
{
m_keylatch = 0;
m_attrlatch = 0;
m_vram = make_unique_clear<u16[]>(0x800); // 6x MM2114 with weird addressing
m_baud_clock = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(microterm_f8_state::baud_clock), this));
@ -93,6 +95,7 @@ void microterm_f8_state::machine_start()
save_item(NAME(m_port00));
save_item(NAME(m_keylatch));
save_item(NAME(m_attrlatch));
save_item(NAME(m_scroll));
save_pointer(NAME(m_vram), 0x800);
}
@ -192,8 +195,8 @@ READ8_MEMBER(microterm_f8_state::vram_r)
assert(vaddr < 0x800);
u16 vdata = m_vram[vaddr];
if ((m_port00 & 0x05) == 0 && !machine().side_effects_disabled())
m_port00 = (m_port00 & 0x0f) | (vdata & 0xf00) >> 4;
if (!machine().side_effects_disabled())
m_attrlatch = (vdata & 0xf00) >> 4;
// Bit 7 indicates protected attribute
if ((~vdata & (~m_jumpers->read() >> 1) & 0xf00) != 0)
@ -207,7 +210,9 @@ WRITE8_MEMBER(microterm_f8_state::vram_w)
offs_t vaddr = (offset >> 8) * 80 + (offset & 0x007f);
assert(vaddr < 0x800);
m_vram[vaddr] = data | (m_port00 & 0xf0) << 4;
m_vram[vaddr] = data | u16(m_port00 & 0xf0) << 4;
if (BIT(m_port00, 0))
m_vram[vaddr] |= u16(m_attrlatch) << 4;
}
WRITE8_MEMBER(microterm_f8_state::uart_transmit_w)
@ -249,6 +254,9 @@ READ8_MEMBER(microterm_f8_state::port00_r)
if (!BIT(m_dsw[2]->read(), 0))
flags |= 0x02;
if (BIT(m_port00, 0))
flags |= m_attrlatch;
return flags;
}