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tv912b, tv912c: Add protected, underline, invert and blink field attributes; make cursor blinking more accurate

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This commit is contained in:
AJR 2020-03-19 18:35:55 -04:00
parent 9cff09c902
commit f13d2bd1ca
1 changed files with 46 additions and 6 deletions
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52
src/mame/drivers/tv912.cpp
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@ -89,6 +89,11 @@ public:
, m_option(*this, "OPTION")
, m_dtr(*this, "DTR")
, m_baudgen_timer(nullptr)
, m_force_blank(false)
, m_4hz_flasher(false)
, m_2hz_flasher(false)
, m_lpt_select(false)
, m_keyboard_scan(false)
{ }
void tv912(machine_config &config);
@ -143,6 +148,7 @@ private:
bool m_force_blank;
bool m_4hz_flasher;
bool m_2hz_flasher;
bool m_lpt_select;
u8 m_keyboard_scan;
std::unique_ptr<u8[]> m_dispram;
@ -177,6 +183,8 @@ WRITE8_MEMBER(tv912_state::p2_w)
m_bankdev->set_bank(data & 0x0f);
// P24: +4Hz Flasher
if (BIT(data, 4) && !m_4hz_flasher)
m_2hz_flasher = !m_2hz_flasher;
m_4hz_flasher = BIT(data, 4);
}
@ -280,13 +288,20 @@ u32 tv912_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, cons
int scroll = m_crtc->upscroll_offset();
for (int y = cliprect.top(); y <= cliprect.bottom(); y++)
u8 charctrl = 0x8, charctrl_latch = 0x8;
for (int y = 0; y < 240; y++)
{
int row = ((y / 10) + scroll) % 24;
int ra = y % 10;
int x = 0;
u8 *charbase = &m_p_chargen[(ra & 7) | BIT(videoctrl, 1) << 10];
if (ra == 0)
charctrl_latch = charctrl;
else
charctrl = charctrl_latch;
for (int pos = 0; pos < 80; pos++)
{
u8 ch = (pos < 64)
@ -296,25 +311,49 @@ u32 tv912_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, cons
if (CHARSET_TEST && pos >= 32 && pos < 64)
ch = (pos & 0x1f) | (row & 7) << 5;
u8 data = (ra > 0 && ra < 9) ? charbase[(ch & 0x7f) << 3] : 0;
u8 dots = (data & 0xfc) >> 1;
bool inhibit = ra == 0 || ra == 9;
bool underline = ra == 9 && BIT(charctrl, 0);
bool invert = BIT(charctrl, 1);
if ((ch & 0x60) == 0)
{
inhibit = true;
if (BIT(ch, 4))
charctrl = ch & 0xf;
else
charctrl = (charctrl & 0xc) | (ch & 0x3);
if (!BIT(ch, 0))
underline = false;
if (!BIT(ch, 1))
invert = false;
}
else if ((charctrl & 0xc) == 0xc && m_2hz_flasher)
inhibit = true;
u8 data = inhibit ? 0 : charbase[(ch & 0x7f) << 3];
u8 dots = underline ? 0xff : (data & 0xfc) >> 1;
bool adv = BIT(data, 1);
if (x == curs.left() && y >= curs.top() && y <= curs.bottom())
{
if (BIT(videoctrl, 0) || !m_4hz_flasher)
if (m_4hz_flasher && !BIT(videoctrl, 0))
dots = 0;
else
dots ^= 0xff;
}
if (invert)
dots ^= 0xff;
// Protected characters are displayed at half intensity
rgb_t fg = BIT(ch, 7) ? rgb_t(0xc0, 0xc0, 0xc0) : rgb_t::white();
for (int d = 0; d < TV912_CH_WIDTH / 2; d++)
{
if (x >= cliprect.left() && x <= cliprect.right())
bitmap.pix(y, x) = BIT(dots, 7) ? rgb_t::white() : rgb_t::black();
bitmap.pix(y, x) = BIT(dots, 7) ? fg : rgb_t::black();
x++;
if (adv)
dots <<= 1;
if (x >= cliprect.left() && x <= cliprect.right())
bitmap.pix(y, x) = BIT(dots, 7) ? rgb_t::white() : rgb_t::black();
bitmap.pix(y, x) = BIT(dots, 7) ? fg : rgb_t::black();
x++;
if (!adv)
dots <<= 1;
@ -339,6 +378,7 @@ void tv912_state::machine_start()
save_item(NAME(m_force_blank));
save_item(NAME(m_lpt_select));
save_item(NAME(m_4hz_flasher));
save_item(NAME(m_2hz_flasher));
save_item(NAME(m_keyboard_scan));
save_pointer(NAME(m_dispram), 0x1000);
}