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author AJR <ajrhacker@users.noreply.github.com>2020-03-19 18:35:55 -0400
committer AJR <ajrhacker@users.noreply.github.com>2020-03-19 18:40:42 -0400
commitf13d2bd1ca64d33fe5367f8f6e5e6c26d469bebc (patch)
treef2370839c9e554bb56ccd8032715cbeb13afd9d2
parent9cff09c902e21858a54a0390df24c5425c12e292 (diff)
tv912b, tv912c: Add protected, underline, invert and blink field attributes; make cursor blinking more accurate
-rw-r--r--src/mame/drivers/tv912.cpp52
1 files changed, 46 insertions, 6 deletions
diff --git a/src/mame/drivers/tv912.cpp b/src/mame/drivers/tv912.cpp
index 5646f1faa34..42c9b103407 100644
--- a/src/mame/drivers/tv912.cpp
+++ b/src/mame/drivers/tv912.cpp
@@ -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);
}