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mc1502: try to work around issues (nw)

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This commit is contained in:
cracyc 2020-05-01 22:35:20 -05:00
parent 194e9f2cb5
commit 916dce9296
3 changed files with 30 additions and 2 deletions
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24
src/devices/bus/isa/cga.cpp
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@ -1616,6 +1616,30 @@ READ8_MEMBER( isa8_ec1841_0002_device::io_read )
DEFINE_DEVICE_TYPE(ISA8_CGA_MC1502, isa8_cga_mc1502_device, "cga_mc1502", "MC1502 CGA")
void isa8_cga_mc1502_device::device_add_mconfig(machine_config &config)
{
screen_device &screen(SCREEN(config, CGA_SCREEN_NAME, SCREEN_TYPE_RASTER));
screen.set_raw(XTAL(16'000'000), 912, 0, 640, 462, 0, 400);
screen.set_screen_update(FUNC(isa8_cga_mc1502_device::screen_update));
PALETTE(config, m_palette).set_entries(/* CGA_PALETTE_SETS * 16*/ 65536);
MC6845(config, m_crtc, XTAL(16'000'000)/16); // soviet clone
m_crtc->set_screen(nullptr);
m_crtc->set_show_border_area(false);
m_crtc->set_char_width(8);
m_crtc->set_update_row_callback(FUNC(isa8_cga_mc1502_device::crtc_update_row));
m_crtc->out_hsync_callback().set(FUNC(isa8_cga_mc1502_device::hsync_changed));
m_crtc->out_vsync_callback().set(FUNC(isa8_cga_mc1502_device::vsync_changed));
m_crtc->set_reconfigure_callback(FUNC(isa8_cga_mc1502_device::reconfigure));
}
MC6845_RECONFIGURE( isa8_cga_mc1502_device::reconfigure )
{
// this has a different horiz freq
m_screen->configure(width, height, visarea, frame_period);
}
//-------------------------------------------------
// isa8_cga_mc1502_device - constructor
//-------------------------------------------------

3
src/devices/bus/isa/cga.h
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@ -263,7 +263,10 @@ public:
// construction/destruction
isa8_cga_mc1502_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// optional information overrides
virtual void device_add_mconfig(machine_config &config) override;
virtual const tiny_rom_entry *device_rom_region() const override;
private:
MC6845_RECONFIGURE(reconfigure);
};
// device type definition

5
src/devices/bus/isa/mc1502_fdc.cpp
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@ -95,8 +95,9 @@ void mc1502_fdc_device::mc1502_wd17xx_aux_w(uint8_t data)
floppy->ss_w((data & 2) ? 1 : 0);
// bits 2, 3 -- motor on (drive 0, 1)
floppy0->mon_w(!(data & 4));
floppy1->mon_w(!(data & 8));
// the schematic appears to show the motor lines connected, if they aren't then motor_on doesn't work correctly
floppy0->mon_w(!(data & 12));
floppy1->mon_w(!(data & 12));
if (data & 12)
{