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uts20 : added screen 2 (disp 1-2 key works now)

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This commit is contained in:
Robbbert 2019-01-11 11:57:02 +11:00
parent ade90cff23
commit b2cbb981f4
1 changed files with 10 additions and 2 deletions
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12
src/mame/drivers/univac.cpp
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@ -163,6 +163,7 @@ private:
void nvram_w(offs_t offset, u8 data);
DECLARE_WRITE_LINE_MEMBER(nvram_protect_w);
DECLARE_WRITE_LINE_MEMBER(select_disp_w);
DECLARE_WRITE_LINE_MEMBER(ram_control_w);
DECLARE_WRITE_LINE_MEMBER(parity_poison_w);
DECLARE_WRITE_LINE_MEMBER(display_enable_w);
@ -200,6 +201,7 @@ private:
required_shared_ptr<u8> m_p_nvram;
std::unique_ptr<u8 []> m_p_parity;
u16 m_disp_mask;
u16 m_bank_mask;
bool m_parity_poison;
bool m_display_enable;
@ -271,6 +273,11 @@ WRITE_LINE_MEMBER(univac_state::nvram_protect_w)
m_nvram_protect = m_screen->vpos() < 10;
}
WRITE_LINE_MEMBER(univac_state::select_disp_w)
{
m_disp_mask = state ? 0x2000 : 0x0000;
}
WRITE_LINE_MEMBER(univac_state::ram_control_w)
{
m_bank_mask = state ? 0x2000 : 0x0000;
@ -456,7 +463,7 @@ uint32_t univac_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap
}
u8 y,ra,chr;
uint16_t sy=0,x,ma=0,gfx; //m_bank_mask; (it isn't port43 that selects the screen)
uint16_t sy=0,x,ma=0,gfx;
m_framecnt++;
@ -468,7 +475,7 @@ uint32_t univac_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap
for (x = ma; x < ma + 80; x++)
{
chr = m_p_videoram[x]; // bit 7 = rv attribute (or dim, depending on control-page setting)
chr = ram_r(x ^ m_disp_mask); // bit 7 = rv attribute (or dim, depending on control-page setting)
gfx = m_p_chargen[((chr & 0x7f)<<4) | ra];
@ -536,6 +543,7 @@ MACHINE_CONFIG_START(univac_state::uts20)
m_maincpu->set_daisy_config(daisy_chain);
ls259_device &latch_40(LS259(config, "latch_40")); // actual type and location unknown
latch_40.q_out_cb<1>().set(FUNC(univac_state::select_disp_w));
latch_40.q_out_cb<3>().set(FUNC(univac_state::ram_control_w));
ls259_device &latch_c0(LS259(config, "latch_c0")); // actual type and location unknown