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video/mc6845.cpp: lift horizontal display and mode control from being zeroed in device_reset

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* fix bml3 getting stuck on soft resets;
This commit is contained in:
angelosa 2024-09-21 15:44:33 +02:00
parent 7c853ef3e1
commit 6aeb83416c
2 changed files with 12 additions and 9 deletions
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6
src/devices/video/mc6845.cpp
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@ -1280,11 +1280,13 @@ void mc6845_device::device_reset()
m_light_pen_latched = false;
// TODO: as per the note above, none of these should reset unless otherwise proven.
m_cursor_addr = 0;
m_line_address = 0;
m_horiz_disp = 0;
// bml3 in particular disagrees with these two.
//m_horiz_disp = 0;
//m_mode_control = 0;
m_cursor_x = 0;
m_mode_control = 0;
m_register_address_latch = 0;
m_update_addr = 0;
m_light_pen_addr = 0;

15
src/mame/hitachi/bml3.cpp
View File

@ -924,9 +924,10 @@ void bml3_state::machine_reset()
m_nmi = 0;
m_kbt = 0;
m_hres_reg = 0;
m_vres_reg = 0;
crtc_change_clock();
// NOTE: bml3 do not bother with CRTC on soft resets (which is physically tied to front panel).
//m_hres_reg = 0;
//m_vres_reg = 0;
//crtc_change_clock();
}
void bml3mk5_state::machine_start()
@ -1080,10 +1081,10 @@ void bml3_state::bml3(machine_config &config)
m_cassette->set_interface("bml3_cass");
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_refresh_hz(60);
screen.set_vblank_time(ATTOSECONDS_IN_USEC(2400)); /* Service manual specifies "Raster return period" as 2.4 ms (p.64), although the total vertical non-displaying time seems to be 4 ms. */
screen.set_size(640, 400);
screen.set_visarea(0, 320-1, 0, 200-1);
// Service manual specifies "Raster return period" as 2.4 ms (p.64),
// although the total vertical non-displaying time seems to be 4 ms.
// NOTE: D80_CLOCK x 2 as per MAME interlace limitation
screen.set_raw(D80_CLOCK * 2, 1024, 0, 640 - 1, 518, 0, 400 - 1);
screen.set_screen_update("crtc", FUNC(mc6845_device::screen_update));
PALETTE(config, m_palette, palette_device::BRG_3BIT);