// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/***************************************************************************
Bashkiria-2M machine driver by Miodrag Milanovic
28/03/2008 Preliminary driver.
****************************************************************************/
#include "emu.h"
#include "cpu/i8085/i8085.h"
#include "includes/b2m.h"
uint8_t b2m_state::keyboard_r(offs_t offset)
{
uint8_t key = 0x00;
if (offset < 0x100) {
if ((offset & 0x01)!=0) { key |= ioport("LINE0")->read(); }
if ((offset & 0x02)!=0) { key |= ioport("LINE1")->read(); }
if ((offset & 0x04)!=0) { key |= ioport("LINE2")->read(); }
if ((offset & 0x08)!=0) { key |= ioport("LINE3")->read(); }
if ((offset & 0x10)!=0) { key |= ioport("LINE4")->read(); }
if ((offset & 0x20)!=0) { key |= ioport("LINE5")->read(); }
if ((offset & 0x40)!=0) { key |= ioport("LINE6")->read(); }
if ((offset & 0x80)!=0) { key |= ioport("LINE7")->read(); }
} else {
if ((offset & 0x01)!=0) { key |= ioport("LINE8")->read(); }
if ((offset & 0x02)!=0) { key |= ioport("LINE9")->read(); }
if ((offset & 0x04)!=0) { key |= ioport("LINE10")->read(); }
}
return key;
}
void b2m_state::set_bank(int bank)
{
uint8_t *rom;
address_space &space = m_maincpu->space(AS_PROGRAM);
uint8_t *ram = m_ram->pointer();
space.install_ram(0x0000, 0xffff, ram);
rom = memregion("maincpu")->base();
switch(bank) {
case 0 :
case 1 :
space.unmap_write(0xe000, 0xffff);
space.install_rom(0xe000, 0xffff, rom);
break;
case 2 :
space.unmap_write(0x2800, 0x2fff);
space.install_read_handler(0x2800, 0x2fff, read8sm_delegate(*this, FUNC(b2m_state::keyboard_r)));
space.install_ram(0x3000, 0x6fff, ram + 0x10000);
space.unmap_write(0xe000, 0xffff);
space.install_rom(0xe000, 0xffff, rom);
break;
case 3 :
space.unmap_write(0x2800, 0x2fff);
space.install_read_handler(0x2800, 0x2fff, read8sm_delegate(*this, FUNC(b2m_state::keyboard_r)));
space.install_ram(0x3000, 0x6fff, ram + 0x14000);
space.unmap_write(0xe000, 0xffff);
space.install_rom(0xe000, 0xffff, rom);
break;
case 4 :
space.install_read_handler(0x2800, 0x2fff, read8sm_delegate(*this, FUNC(b2m_state::keyboard_r)));
space.install_ram(0x3000, 0x6fff, ram + 0x18000);
space.unmap_write(0xe000, 0xffff);
space.install_rom(0xe000, 0xffff, rom);
break;
case 5 :
space.unmap_write(0x2800, 0x2fff);
space.install_read_handler(0x2800, 0x2fff, read8sm_delegate(*this, FUNC(b2m_state::keyboard_r)));
space.install_ram(0x3000, 0x6fff, ram + 0x1c000);
space.unmap_write(0xe000, 0xffff);
space.install_rom(0xe000, 0xffff, rom);
break;
case 6 :
break;
case 7 :
space.unmap_write(0x0000, 0xffff);
space.unmap_read(0x0000, 0xffff);
space.install_rom(0x0000, 0x1fff, rom);
space.install_rom(0x2800, 0x2fff, rom);
space.install_rom(0x3000, 0x4fff, rom);
space.install_rom(0x7000, 0x8fff, rom);
space.install_rom(0xe000, 0xffff, rom);
break;
}
}
WRITE_LINE_MEMBER(b2m_state::pit_out1)
{
m_speaker->level_w(state);
}
void b2m_state::ppi1_porta_w(uint8_t data)
{
m_porta = data;
}
void b2m_state::ppi1_portb_w(uint8_t data)
{
m_video_scroll = data;
}
void b2m_state::ppi1_portc_w(uint8_t data)
{
m_portc = data;
set_bank(m_portc & 7);
m_video_page = BIT(m_portc, 7);
}
uint8_t b2m_state::ppi1_portb_r()
{
return m_video_scroll;
}
WRITE_LINE_MEMBER( b2m_state::fdc_drq )
{
/* Clears HALT state of CPU when data is ready to read */
if (state)
m_maincpu->set_input_line(INPUT_LINE_HALT, CLEAR_LINE);
}
void b2m_state::ppi2_portc_w(uint8_t data)
{
uint8_t drive = BIT(~data, 1);
uint8_t side = BIT(~data, 0);
floppy_image_device *floppy = nullptr;
if (m_fd[drive].found())
floppy = m_fd[drive]->get_device();
if (floppy)
floppy->mon_w(0);
m_fdc->set_floppy(floppy);
if (floppy)
floppy->ss_w(side);
/*
When bit 5 is set CPU is in HALT state and stay there until
DRQ is triggered from floppy side
*/
if ((data & 0xf0)==0x20) {
m_maincpu->set_input_line(INPUT_LINE_HALT, ASSERT_LINE);
}
}
uint8_t b2m_state::romdisk_porta_r()
{
uint8_t *romdisk = memregion("maincpu")->base() + 0x2000;
return romdisk[m_romdisk_msb*256+m_romdisk_lsb];
}
void b2m_state::romdisk_portb_w(uint8_t data)
{
m_romdisk_lsb = data;
}
void b2m_state::romdisk_portc_w(uint8_t data)
{
m_romdisk_msb = data & 0x7f;
}
void b2m_state::palette_w(offs_t offset, uint8_t data)
{
uint8_t b = BIT(~data, 6, 2) * 0x55;
uint8_t g = BIT(~data, 4, 2) * 0x55;
uint8_t r = BIT(~data, 2, 2) * 0x55;
uint8_t bw = BIT(~data, 0, 2) * 0x55;
m_color[offset & 3] = data;
if (ioport("MONITOR")->read()==1)
m_palette->set_pen_color(offset, r, g, b);
else
m_palette->set_pen_color(offset, bw, bw, bw);
}
uint8_t b2m_state::palette_r(offs_t offset)
{
return m_color[offset];
}
void b2m_state::localmachine_w(uint8_t data)
{
m_localmachine = data;
}
uint8_t b2m_state::localmachine_r()
{
return m_localmachine;
}
void b2m_state::postload()
{
set_bank(m_portc & 7);
}
void b2m_state::machine_start()
{
/* register for state saving */
save_item(NAME(m_porta));
save_item(NAME(m_video_scroll));
save_item(NAME(m_portc));
save_item(NAME(m_video_page));
save_item(NAME(m_romdisk_lsb));
save_item(NAME(m_romdisk_msb));
save_pointer(NAME(m_color), 4);
save_item(NAME(m_localmachine));
save_item(NAME(m_vblank_state));
machine().save().register_postload(save_prepost_delegate(FUNC(b2m_state::postload), this));
}
INTERRUPT_GEN_MEMBER(b2m_state::vblank_interrupt)
{
m_vblank_state++;
if (m_vblank_state>1) m_vblank_state=0;
m_pic->ir0_w(m_vblank_state);
}
void b2m_state::machine_reset()
{
m_vblank_state = 0;
set_bank(7);
}
uint32_t b2m_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
u8 const *const ram = m_ram->pointer();
for (int x = 0; x < 48; x++)
{
for (int y = 0; y < 256; y++)
{
u16 const t = x*256 + ((y + m_video_scroll) & 0xff);
u8 code1, code2;
if (m_video_page==0)
{
code1 = ram[0x11000 + t];
code2 = ram[0x15000 + t];
}
else
{
code1 = ram[0x19000 + t];
code2 = ram[0x1d000 + t];
}
for (int b = 7; b >= 0; b--)
{
u8 const col = (BIT(code2, b)<<1) + BIT(code1, b);
bitmap.pix(y, x*8+b) = col;
}
}
}
return 0;
}
void b2m_state::b2m_palette(palette_device &palette) const
{
static constexpr rgb_t b2m_pens[4] = {
{ 0x00, 0x00, 0x00 }, // 0
{ 0x00, 0x00, 0x00 }, // 1
{ 0x00, 0x00, 0x00 }, // 2
{ 0x00, 0x00, 0x00 }, // 3
};
palette.set_pen_colors(0, b2m_pens);
}