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tandy2k.cpp
1147 lines (919 loc) · 30.7 KB
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tandy2k.cpp
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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/***************************************************************************
Tandy 2000
****************************************************************************/
/*
TODO:
- floppy
- HDL is also connected to WP/TS input where TS is used to detect motor status
- 3 second motor off delay timer
- video (video RAM is at memory top - 0x1400, i.e. 0x1ec00)
- keyboard ROM, same as earlier tandy 1000
- WD1010
- hard disk
- clock/mouse 8042 mcu ROM, probably same as tandy 1000 isa clock/mouse adapter
- sab3019 rtc
*/
#include "emu.h"
#include "tandy2k.h"
#include "screen.h"
#include "softlist.h"
#include "speaker.h"
#define LOG 1
// Read/Write Handlers
void tandy2k_state::update_drq()
{
int drq0 = CLEAR_LINE;
int drq1 = CLEAR_LINE;
for (int i = 0; i < 4; i++)
{
if (BIT(m_dma_mux, 0 + i))
{
if (BIT(m_dma_mux, 4 + i))
drq1 |= m_busdmarq[i];
else
drq0 |= m_busdmarq[i];
}
}
m_maincpu->drq0_w(drq0);
m_maincpu->drq1_w(drq1);
}
void tandy2k_state::dma_request(int line, int state)
{
m_busdmarq[line] = state;
update_drq();
}
void tandy2k_state::speaker_update()
{
int level = !(m_spkrdata & m_outspkr);
m_speaker->level_w(level);
}
uint8_t tandy2k_state::char_ram_r(offs_t offset)
{
return m_char_ram[offset];
}
void tandy2k_state::char_ram_w(offs_t offset, uint8_t data)
{
m_char_ram[offset] = data;
}
uint8_t tandy2k_state::videoram_r(offs_t offset)
{
address_space &program = m_maincpu->space(AS_PROGRAM);
offs_t addr = (m_vram_base << 15) | (offset << 1);
uint16_t data = program.read_word(addr);
// character
m_drb0->write(data & 0xff);
// attributes
m_drb1->write(data >> 8);
return data & 0xff;
}
uint8_t tandy2k_state::enable_r()
{
/*
bit signal description
0 RS-232 ring indicator
1 RS-232 carrier detect
2
3
4
5
6
7 _ACLOW
*/
uint8_t data = 0x80;
data |= m_rs232->ri_r();
data |= m_rs232->dcd_r() << 1;
return data;
}
void tandy2k_state::enable_w(uint8_t data)
{
/*
bit signal description
0 KBEN keyboard enable
1 EXTCLK external baud rate clock
2 SPKRGATE enable periodic speaker output
3 SPKRDATA direct output to speaker
4 RFRQGATE enable refresh and baud rate clocks
5 FDCRESET* reset 8272
6 TMRIN0 enable 80186 timer 0
7 TMRIN1 enable 80186 timer 1
*/
if (LOG) logerror("ENABLE %02x\n", data);
// keyboard enable
m_kb->power_w(BIT(data, 0));
m_pc_keyboard->enable(BIT(data, 0));
// external baud rate clock
m_extclk = BIT(data, 1);
// speaker gate
m_pit->write_gate0(BIT(data, 2));
// speaker data
m_spkrdata = BIT(data, 3);
speaker_update();
// refresh and baud rate clocks
m_pit->write_gate1(BIT(data, 4));
m_pit->write_gate2(BIT(data, 4));
// FDC reset
m_fdc->reset_w(!BIT(data, 5));
// timer 0 enable
m_maincpu->tmrin0_w(BIT(data, 6));
// timer 1 enable
m_maincpu->tmrin1_w(BIT(data, 7));
}
void tandy2k_state::dma_mux_w(uint8_t data)
{
/*
bit description
0 DMA channel 0 enable
1 DMA channel 1 enable
2 DMA channel 2 enable
3 DMA channel 3 enable
4 DMA channel 0 select
5 DMA channel 1 select
6 DMA channel 2 select
7 DMA channel 3 select
*/
if (LOG) logerror("DMA MUX %02x\n", data);
m_dma_mux = data;
// check for DMA error
int drq0 = 0;
int drq1 = 0;
for (int ch = 0; ch < 4; ch++)
{
if (BIT(data, ch)) { if (BIT(data, ch + 4)) drq1++; else drq0++; }
}
int dme = (drq0 > 2) || (drq1 > 2);
m_pic1->ir6_w(dme);
update_drq();
}
uint8_t tandy2k_state::kbint_clr_r()
{
if (m_pb_sel == KBDINEN)
{
m_kb->busy_w(1);
m_pic1->ir0_w(CLEAR_LINE);
return m_pc_keyboard->read();
}
return 0xff;
}
uint8_t tandy2k_state::clkmouse_r(offs_t offset)
{
uint8_t ret = 0;
switch (offset)
{
case 0:
if (!m_clkmouse_cnt)
return 0;
ret = m_clkmouse_cmd[--m_clkmouse_cnt];
m_pic1->ir2_w(0);
if (m_clkmouse_cnt > 0)
m_mcu_delay->adjust(attotime::from_msec(1));
break;
case 2:
ret = m_buttons->read();
if (m_clkmouse_cnt)
ret |= 1;
break;
}
return ret;
}
void tandy2k_state::clkmouse_w(offs_t offset, uint8_t data)
{
switch (offset)
{
case 0:
m_pic1->ir2_w(0);
if (m_clkmouse_cnt < 8)
m_clkmouse_cmd[m_clkmouse_cnt++] = data;
break;
case 1:
break;
case 2:
if (m_clkmouse_cnt < 8)
m_clkmouse_cmd[m_clkmouse_cnt++] = data;
switch (m_clkmouse_cmd[0])
{
case 0x01: //set time
break;
case 0x02: //read time
break;
case 0x08:
if(m_clkmouse_cmd[1] > 0)
m_clkmouse_irq |= MO_IRQ;
else
m_clkmouse_irq &= ~MO_IRQ;
if(m_clkmouse_cmd[2] > 0)
m_clkmouse_irq |= BT_IRQ;
else
m_clkmouse_irq &= ~BT_IRQ;
break;
case 0x20:
if(m_clkmouse_cmd[1] > 0)
m_mouse_timer->adjust(attotime::from_hz(40), 0, attotime::from_hz(40));
else
m_mouse_timer->adjust(attotime::never);
break;
}
m_clkmouse_cnt = 0;
break;
case 3:
m_pic1->ir2_w(0);
m_clkmouse_cnt = 0;
m_clkmouse_irq = 0;
m_mouse_x = m_x_axis->read();
m_mouse_y = m_y_axis->read();
break;
}
}
uint8_t tandy2k_state::fldtc_r()
{
if (LOG) logerror("FLDTC\n");
fldtc_w(0);
return 0;
}
void tandy2k_state::fldtc_w(uint8_t data)
{
m_fdc->tc_w(1);
m_fdc->tc_w(false);
}
void tandy2k_state::addr_ctrl_w(uint8_t data)
{
/*
bit signal description
8 A15 A15 of video access
9 A16 A16 of video access
10 A17 A17 of video access
11 A18 A18 of video access
12 A19 A19 of video access
13 CLKSP0 clock speed (0 = 22.4 MHz, 1 = 28 MHz)
14 CLKCNT dots/char (0 = 10 [800x400], 1 = 8 [640x400])
15 VIDOUTS selects the video source for display on monochrome monitor
*/
if (LOG) logerror("Address Control %02x\n", data);
// video access
m_vram_base = data & 0x1f;
// video clock speed
int clkspd = BIT(data, 5);
int clkcnt = BIT(data, 6);
if (m_clkspd != clkspd || m_clkcnt != clkcnt)
{
const XTAL busdotclk = 16_MHz_XTAL * 28 / (clkspd ? 16 : 20);
const XTAL vidcclk = busdotclk / (clkcnt ? 8 : 10);
m_vpac->set_character_width(clkcnt ? 8 : 10);
m_vpac->set_unscaled_clock(vidcclk);
m_vac->set_unscaled_clock(busdotclk);
m_timer_vidldsh->adjust(attotime::from_hz(vidcclk), 0, attotime::from_hz(vidcclk));
m_clkspd = clkspd;
m_clkcnt = clkcnt;
}
// video source select
m_vidouts = BIT(data, 7);
}
// Memory Maps
void tandy2k_state::vrambank_mem(address_map &map)
{
map(0x00000, 0x17fff).ram().share("hires_ram");
map(0x18000, 0x1ffff).noprw();
}
void tandy2k_state::tandy2k_mem(address_map &map)
{
map.unmap_value_high();
map(0xe0000, 0xe7fff).rw(m_vrambank, FUNC(address_map_bank_device::read16), FUNC(address_map_bank_device::write16));
map(0xf8000, 0xfbfff).rw(FUNC(tandy2k_state::char_ram_r), FUNC(tandy2k_state::char_ram_w)).umask16(0x00ff);
map(0xfc000, 0xfdfff).mirror(0x2000).rom().region(I80186_TAG, 0);
}
void tandy2k_state::tandy2k_io(address_map &map)
{
map.unmap_value_high();
map(0x00000, 0x00000).mirror(0x8).rw(FUNC(tandy2k_state::enable_r), FUNC(tandy2k_state::enable_w));
map(0x00002, 0x00002).mirror(0x8).w(FUNC(tandy2k_state::dma_mux_w));
map(0x00004, 0x00004).mirror(0x8).rw(FUNC(tandy2k_state::fldtc_r), FUNC(tandy2k_state::fldtc_w));
map(0x00010, 0x00013).mirror(0xc).rw(m_uart, FUNC(i8251_device::read), FUNC(i8251_device::write)).umask16(0x00ff);
map(0x00030, 0x00033).mirror(0xc).m(m_fdc, FUNC(i8272a_device::map)).umask16(0x00ff);
map(0x00040, 0x00047).mirror(0x8).rw(m_pit, FUNC(pit8253_device::read), FUNC(pit8253_device::write)).umask16(0x00ff);
map(0x00050, 0x00057).mirror(0x8).rw(m_i8255a, FUNC(i8255_device::read), FUNC(i8255_device::write)).umask16(0x00ff);
map(0x00052, 0x00052).mirror(0x8).r(FUNC(tandy2k_state::kbint_clr_r));
map(0x00060, 0x00063).mirror(0xc).rw(m_pic0, FUNC(pic8259_device::read), FUNC(pic8259_device::write)).umask16(0x00ff);
map(0x00070, 0x00073).mirror(0xc).rw(m_pic1, FUNC(pic8259_device::read), FUNC(pic8259_device::write)).umask16(0x00ff);
map(0x00080, 0x00080).mirror(0xe).rw(m_fdc, FUNC(i8272a_device::dma_r), FUNC(i8272a_device::dma_w));
map(0x00100, 0x0017f).rw(m_vpac, FUNC(crt9007_device::read), FUNC(crt9007_device::write)).umask16(0x00ff);
map(0x00100, 0x0017f).w(FUNC(tandy2k_state::addr_ctrl_w)).umask16(0xff00);
map(0x00180, 0x00180).r(FUNC(tandy2k_state::hires_status_r)).umask16(0x00ff);
map(0x00180, 0x0018f).mirror(0x10).w(m_colpal, FUNC(palette_device::write8)).umask16(0x00ff).share("colpal");
map(0x001a0, 0x001a0).w(FUNC(tandy2k_state::hires_plane_w)).umask16(0x00ff);
map(0x002fc, 0x002ff).rw(FUNC(tandy2k_state::clkmouse_r), FUNC(tandy2k_state::clkmouse_w));
}
void tandy2k_state::tandy2k_hd_io(address_map &map)
{
tandy2k_io(map);
// map(0x000e0, 0x000ff).w(FUNC(tandy2k_state::hdc_dack_w).umask16(0x00ff));
// map(0x0026c, 0x0026c).rw(WD1010_TAG, FUNC(wd1010_device::hdc_reset_r), FUNC(wd1010_device::hdc_reset_w));
// map(0x0026e, 0x0027e).rw(WD1010_TAG, FUNC(wd1010_device::wd1010_r), FUNC(wd1010_device::wd1010_w));
}
void tandy2k_state::vpac_mem(address_map &map)
{
map(0x0000, 0x3fff).r(FUNC(tandy2k_state::videoram_r));
}
// Input Ports
static INPUT_PORTS_START( tandy2k )
// defined in machine/tandy2kb.c
PORT_START("MOUSEBTN")
PORT_BIT( 0xff8f, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_CODE(MOUSECODE_BUTTON1) PORT_CHANGED_MEMBER(DEVICE_SELF, tandy2k_state, input_changed, 1)
PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_CODE(MOUSECODE_BUTTON2) PORT_CHANGED_MEMBER(DEVICE_SELF, tandy2k_state, input_changed, 1)
PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_UNUSED ) /* this would be button three but AFAIK no tandy mouse ever had one */
PORT_START("MOUSEX")
PORT_BIT( 0xffff, 0x00, IPT_MOUSE_X ) PORT_SENSITIVITY(50) PORT_KEYDELTA(0) PORT_CHANGED_MEMBER(DEVICE_SELF, tandy2k_state, input_changed, 0)
PORT_START("MOUSEY")
PORT_BIT( 0xffff, 0x00, IPT_MOUSE_Y ) PORT_SENSITIVITY(50) PORT_KEYDELTA(0) PORT_CHANGED_MEMBER(DEVICE_SELF, tandy2k_state, input_changed, 0)
INPUT_PORTS_END
static INPUT_PORTS_START( tandy2kb_hle )
PORT_INCLUDE(pc_keyboard)
PORT_MODIFY("pc_keyboard_2")
PORT_BIT(0x0200, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Cursor Up") PORT_CODE(KEYCODE_UP) /* 29 A9 */
PORT_BIT(0x0800, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Cursor Left") PORT_CODE(KEYCODE_LEFT) /* 2B AB */
PORT_MODIFY("pc_keyboard_3")
PORT_BIT(0x0400, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Caps") PORT_CODE(KEYCODE_CAPSLOCK) PORT_TOGGLE /* Caps Lock 3A BA */
PORT_MODIFY("pc_keyboard_4")
PORT_BIT(0x0020, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("NumLock") PORT_CODE(KEYCODE_NUMLOCK) PORT_TOGGLE /* Num Lock 45 C5 */
/* Hold corresponds to Scroll Lock, but pauses the system when pressed - leaving unmapped by default to avoid conflicting with the UI Toggle key */
PORT_BIT(0x0040, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Hold") /* 46 C6 */
PORT_BIT(0x0080, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("KP 7 \\") PORT_CODE(KEYCODE_7_PAD) /* Keypad 7 47 C7 */
PORT_BIT(0x0100, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("KP 8 ~") PORT_CODE(KEYCODE_8_PAD) /* Keypad 8 48 C8 */
PORT_BIT(0x0200, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("KP 9 (PgUp)") PORT_CODE(KEYCODE_9_PAD) /* Keypad 9 (PgUp) 49 C9 */
PORT_BIT(0x0400, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Cursor Down") PORT_CODE(KEYCODE_DOWN) /* 4A CA */
PORT_BIT(0x0800, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("KP 4 |") PORT_CODE(KEYCODE_4_PAD) /* Keypad 4 4B CB */
PORT_BIT(0x2000, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("KP 6") PORT_CODE(KEYCODE_6_PAD) /* Keypad 6 4D CD */
PORT_BIT(0x4000, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Cursor Right") PORT_CODE(KEYCODE_RIGHT) /* 4E CE */
PORT_BIT(0x8000, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("KP 1 (End)") PORT_CODE(KEYCODE_1_PAD) /* Keypad 1 (End) 4F CF */
PORT_MODIFY("pc_keyboard_5")
PORT_BIT(0x0001, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("KP 2 `") PORT_CODE(KEYCODE_2_PAD) /* Keypad 2 50 D0 */
PORT_BIT(0x0002, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("KP 3 (PgDn)") PORT_CODE(KEYCODE_3_PAD) /* Keypad 3 (PgDn) 51 D1 */
PORT_BIT(0x0004, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("KP 0") PORT_CODE(KEYCODE_0_PAD) /* Keypad 0 52 D2 */
PORT_BIT(0x0008, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("KP - (Del)") PORT_CODE(KEYCODE_MINUS_PAD) /* - Delete 53 D3 */
PORT_BIT(0x0010, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Break") PORT_CODE(KEYCODE_STOP) /* Break 54 D4 */
PORT_BIT(0x0020, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("+ Insert") PORT_CODE(KEYCODE_PLUS_PAD) /* + Insert 55 D5 */
PORT_BIT(0x0040, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME(".") PORT_CODE(KEYCODE_DEL_PAD) /* . 56 D6 */
PORT_BIT(0x0080, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Enter") PORT_CODE(KEYCODE_ENTER_PAD) /* Enter 57 D7 */
PORT_BIT(0x0100, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Home") PORT_CODE(KEYCODE_HOME) /* HOME 58 D8 */
PORT_BIT(0x0200, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("F11") PORT_CODE(KEYCODE_F11) /* F11 59 D9 */
PORT_BIT(0x0400, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("F12") PORT_CODE(KEYCODE_F12) /* F12 5a Da */
INPUT_PORTS_END
class tandy2kb_hle_device : public pc_keyboard_device
{
public:
tandy2kb_hle_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
protected:
virtual ioport_constructor device_input_ports() const override;
};
DEFINE_DEVICE_TYPE(TANDY2K_HLE_KEYB, tandy2kb_hle_device, "tandy2kb_hle", "Tandy 2000 Keyboard HLE")
tandy2kb_hle_device::tandy2kb_hle_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
pc_keyboard_device(mconfig, TANDY2K_HLE_KEYB, tag, owner, clock)
{
m_type = KEYBOARD_TYPE::PC;
}
ioport_constructor tandy2kb_hle_device::device_input_ports() const
{
return INPUT_PORTS_NAME(tandy2kb_hle);
}
INPUT_CHANGED_MEMBER(tandy2k_state::input_changed)
{
if (m_clkmouse_cnt || !m_clkmouse_irq)
return;
const bool is_button = bool(param);
if ((m_clkmouse_irq & BT_IRQ) && is_button)
{
m_clkmouse_cnt = 1;
m_clkmouse_cmd[0] = 'B';
}
else if ((m_clkmouse_irq & MO_IRQ))
{
uint16_t x = m_x_axis->read();
uint16_t y = m_y_axis->read();
uint16_t dx = x - m_mouse_x;
uint16_t dy = y - m_mouse_y;
m_mouse_x = x;
m_mouse_y = y;
m_clkmouse_cnt = 5;
m_clkmouse_cmd[4] = 'M';
m_clkmouse_cmd[3] = dx & 0xff;
m_clkmouse_cmd[2] = dx >> 8;
m_clkmouse_cmd[1] = dy & 0xff;
m_clkmouse_cmd[0] = dy >> 8;
}
m_pic1->ir2_w(1);
}
// Video
uint32_t tandy2k_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
const pen_t *cpen = m_colpal->pens();
address_space &program = m_maincpu->space(AS_PROGRAM);
for (int y = 0; y < 400; y++)
{
uint8_t cgra = y % 16;
for (int sx = 0; sx < 80; sx++)
{
if (m_hires_en & 2)
{
uint8_t a = ((uint8_t *)m_hires_ram.target())[(y * 80) + sx];
uint8_t b = ((uint8_t *)m_hires_ram.target())[(y * 80) + sx + 0x8000];
uint8_t c = ((uint8_t *)m_hires_ram.target())[(y * 80) + sx + 0x8000 * 2];
for (int x = 0; x < 8; x++)
{
int color = BIT(a, x) | (BIT(b, x) << 1) | (BIT(c, x) << 2);
bitmap.pix(y, (sx * 8) + (7 - x)) = cpen[color];
}
}
else
{
offs_t addr = m_ram->size() - 0x1400 + (((y / 16) * 80) + sx) * 2;
uint16_t vidla = program.read_word(addr);
uint8_t attr = vidla >> 8;
uint8_t data = m_char_ram[((vidla & 0xff) << 4) | cgra];
if(attr & 0x80)
data = ~data;
for (int x = 0; x < 8; x++)
{
int color = 4 | (BIT(attr, 6) << 1) | BIT(data, 7);
bitmap.pix(y, (sx * 8) + x) = cpen[color];
data <<= 1;
}
}
}
}
return 0;
}
void tandy2k_state::vpac_vlt_w(int state)
{
m_drb0->ren_w(state);
m_drb0->clrcnt_w(state);
m_drb1->ren_w(state);
m_drb1->clrcnt_w(state);
}
void tandy2k_state::vpac_drb_w(int state)
{
m_drb0->tog_w(state);
m_drb1->tog_w(state);
}
void tandy2k_state::vpac_wben_w(int state)
{
m_drb0->wen1_w(state);
m_drb1->wen1_w(state);
}
void tandy2k_state::vpac_cblank_w(int state)
{
m_cblank = state;
}
void tandy2k_state::vpac_slg_w(int state)
{
m_slg = state;
m_vac->slg_w(state);
}
void tandy2k_state::vpac_sld_w(int state)
{
m_sld = state;
m_vac->sld_w(state);
}
void tandy2k_state::hires_plane_w(uint8_t data)
{
int bank = 3;
if (((data & 1) + ((data >> 1) & 1) + ((data >> 2) & 1)) == 1)
bank = (data & 1) ? 0 : (data & 2) ? 1 : (data & 4) ? 2 : 0;
m_vrambank->set_bank(bank);
m_hires_en = (data >> 4) & 3;
}
// bit 0 - 0 = hires board installed
// bit 1 - 0 = 1 plane, 1 = 3 planes
// bit 2-4 - board rev
uint8_t tandy2k_state::hires_status_r()
{
return 2;
}
void tandy2k_state::vidla_w(uint8_t data)
{
m_vidla = data;
}
void tandy2k_state::drb_attr_w(uint8_t data)
{
/*
bit description
0 BLC -> DBLC (delayed 2 CCLKs)
1 BKC -> DBKC (delayed 2 CCLKs)
2 CHABL
3 MS0
4 MS1
5 BLINK
6 INT
7 REVID
*/
m_blc = BIT(data, 0);
m_bkc = BIT(data, 1);
m_vac->chabl_w(BIT(data, 2));
m_vac->ms0_w(BIT(data, 3));
m_vac->ms1_w(BIT(data, 4));
m_vac->blink_w(BIT(data, 5));
m_vac->intin_w(BIT(data, 6));
m_vac->revid_w(BIT(data, 7));
}
CRT9021_DRAW_CHARACTER_MEMBER( tandy2k_state::vac_draw_character )
{
const pen_t *pen = m_colpal->pens();
for (int i = 0; i < 8; i++)
{
int color = BIT(video, 7 - i);
bitmap.pix(y, x++) = pen[color];
}
}
TIMER_DEVICE_CALLBACK_MEMBER( tandy2k_state::vidldsh_tick )
{
m_drb0->rclk_w(0);
m_drb0->wclk_w(0);
m_drb1->rclk_w(0);
m_drb1->wclk_w(0);
m_vac->ld_sh_w(0);
// 1 busdotclk later
m_vac->blc_w(BIT(m_dblc, 0));
m_dblc >>= 1;
m_dblc |= m_blc << 2;
m_vac->bkc_w(BIT(m_dbkc, 0));
m_dbkc >>= 1;
m_dbkc |= m_bkc << 2;
m_vac->retbl_w(BIT(m_dblank, 0));
m_dblank >>= 1;
m_dblank |= m_cblank << 2;
if (!m_slg)
{
m_cgra >>= 1;
m_cgra |= m_sld << 3;
}
uint8_t vidd = m_char_ram[(m_vidla << 4) | m_cgra];
m_vac->write(vidd);
m_drb0->rclk_w(1);
m_drb0->wclk_w(1);
m_drb1->rclk_w(1);
m_drb1->wclk_w(1);
m_vac->ld_sh_w(1);
}
// Intel 8251A Interface
void tandy2k_state::rxrdy_w(int state)
{
m_rxrdy = state;
m_pic0->ir2_w(m_rxrdy || m_txrdy);
}
void tandy2k_state::txrdy_w(int state)
{
m_txrdy = state;
m_pic0->ir2_w(m_rxrdy || m_txrdy);
}
// Intel 8253 Interface
void tandy2k_state::outspkr_w(int state)
{
m_outspkr = state;
speaker_update();
}
void tandy2k_state::intbrclk_w(int state)
{
if (!m_extclk)
{
m_uart->write_txc(state);
m_uart->write_rxc(state);
}
}
void tandy2k_state::rfrqpulse_w(int state)
{
// memory refresh counter up
}
// Intel 8255A Interface
void tandy2k_state::write_centronics_ack(int state)
{
m_centronics_ack = state;
m_i8255a->pc6_w(state);
}
void tandy2k_state::write_centronics_busy(int state)
{
m_centronics_busy = state;
}
void tandy2k_state::write_centronics_perror(int state)
{
m_centronics_perror = state;
}
void tandy2k_state::write_centronics_select(int state)
{
m_centronics_select = state;
}
void tandy2k_state::write_centronics_fault(int state)
{
m_centronics_fault = state;
}
uint8_t tandy2k_state::ppi_pb_r()
{
/*
bit signal description
0 LPRIN0 auxiliary input 0
1 LPRIN1 auxiliary input 1
2 LPRIN2 auxiliary input 2
3 _LPRACK acknowledge
4 _LPRFLT fault
5 _LPRSEL select
6 LPRPAEM paper empty
7 LPRBSY busy
*/
uint8_t data = 0;
switch (m_pb_sel)
{
case LPINEN:
// printer acknowledge
data |= m_centronics_ack << 3;
// printer fault
data |= m_centronics_fault << 4;
// printer select
data |= m_centronics_select << 5;
// paper empty
data |= m_centronics_perror << 6;
// printer busy
data |= m_centronics_busy << 7;
break;
case KBDINEN:
// keyboard data
data = m_kbdin;
break;
case PORTINEN:
// PCB revision
data = 0x03;
break;
}
return data;
}
void tandy2k_state::ppi_pc_w(uint8_t data)
{
/*
bit signal description
0 port A direction
1 port B input select bit 0
2 port B input select bit 1
3 LPRINT13 interrupt
4 STROBE IN
5 INBUFFULL
6 _LPRACK
7 _LPRDATSTB
*/
// input select
m_pb_sel = (data >> 1) & 0x03;
// interrupt
m_pic1->ir3_w(BIT(data, 3));
// printer strobe
m_centronics->write_strobe(BIT(data, 7));
}
// Intel 8259 Interfaces
/*
IR0 MEMINT00
IR1 TMOINT01
IR2 SERINT02
IR3 BUSINT03
IR4 FLDINT04
IR5 BUSINT05
IR6 HDCINT06
IR7 BUSINT07
*/
/*
IR0 KBDINT10
IR1 VIDINT11
IR2 RATINT12
IR3 LPRINT13
IR4 MCPINT14
IR5 MEMINT15
IR6 DMEINT16
IR7 BUSINT17
*/
// Intel 8272 Interface
void tandy2k_state::fdc_drq_w(int state)
{
dma_request(0, state);
}
void tandy2k_state::fdc_hdl_w(int state)
{
m_floppy0->mon_w(!state);
m_floppy1->mon_w(!state);
}
void tandy2k_state::floppy_formats(format_registration &fr)
{
fr.add_mfm_containers();
fr.add(FLOPPY_TANDY_2000_FORMAT);
}
static void tandy2k_floppies(device_slot_interface &device)
{
device.option_add("525qd", FLOPPY_525_QD);
}
// Keyboard
void tandy2k_state::kbdclk_w(int state)
{
if (!m_kbdclk && state)
{
m_kbdin >>= 1;
m_kbdin |= m_kb->data_r() << 7;
}
m_kbdclk = state;
}
void tandy2k_state::kbddat_w(int state)
{
if (!m_kbddat && state)
{
m_kb->busy_w(m_kbdclk);
m_pic1->ir0_w(!m_kbdclk);
}
m_kbddat = state;
}
uint8_t tandy2k_state::irq_callback(offs_t offset)
{
return (offset ? m_pic1 : m_pic0)->acknowledge();
}
// Machine Initialization
void tandy2k_state::machine_start()
{
address_space &program = m_maincpu->space(AS_PROGRAM);
uint8_t *ram = m_ram->pointer();
int ram_size = m_ram->size();
program.install_ram(0x00000, ram_size - 1, ram);
m_mouse_timer = timer_alloc(FUNC(tandy2k_state::update_mouse), this);
m_mcu_delay = timer_alloc(FUNC(tandy2k_state::mcu_delay_cb), this);
// register for state saving
save_item(NAME(m_dma_mux));
save_item(NAME(m_kbdclk));
save_item(NAME(m_kbddat));
save_item(NAME(m_kbdin));
save_item(NAME(m_extclk));
save_item(NAME(m_rxrdy));
save_item(NAME(m_txrdy));
save_item(NAME(m_pb_sel));
save_item(NAME(m_vidouts));
save_item(NAME(m_clkspd));
save_item(NAME(m_clkcnt));
save_item(NAME(m_outspkr));
save_item(NAME(m_spkrdata));
save_item(NAME(m_clkmouse_cmd));
save_item(NAME(m_clkmouse_cnt));
save_item(NAME(m_clkmouse_irq));
save_item(NAME(m_mouse_x));
save_item(NAME(m_mouse_y));
save_item(NAME(m_hires_en));
}
void tandy2k_state::machine_reset()
{
m_hires_en = 0;
m_clkmouse_cnt = 0;
m_clkmouse_irq = 0;
}
void tandy2k_state::device_reset_after_children()
{
m_pc_keyboard->enable(0);
}
TIMER_CALLBACK_MEMBER(tandy2k_state::update_mouse)
{
uint16_t x = m_x_axis->read();
uint16_t y = m_y_axis->read();
uint16_t dx = x - m_mouse_x;
uint16_t dy = y - m_mouse_y;
m_mouse_x = x;
m_mouse_y = y;
m_clkmouse_cnt = 5;
m_clkmouse_cmd[4] = 'A';
m_clkmouse_cmd[3] = dx & 0xff;
m_clkmouse_cmd[2] = dx >> 8;
m_clkmouse_cmd[1] = dy & 0xff;
m_clkmouse_cmd[0] = dy >> 8;
m_pic1->ir2_w(1);
}
TIMER_CALLBACK_MEMBER(tandy2k_state::mcu_delay_cb)
{
m_pic1->ir2_w(1);
}
rgb_t tandy2k_state::IRGB(uint32_t raw)
{
uint8_t i = (raw >> 3) & 1;
return rgb_t(pal2bit(((raw & 4) >> 1) | i), pal2bit((raw & 2) | i), pal2bit(((raw & 1) << 1) | i));
}
// Machine Driver
void tandy2k_state::tandy2k(machine_config &config)
{
// basic machine hardware
I80186(config, m_maincpu, 16_MHz_XTAL);
m_maincpu->set_addrmap(AS_PROGRAM, &tandy2k_state::tandy2k_mem);
m_maincpu->set_addrmap(AS_IO, &tandy2k_state::tandy2k_io);
m_maincpu->read_slave_ack_callback().set(FUNC(tandy2k_state::irq_callback));