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pcw.cpp
1465 lines (1217 loc) · 48 KB
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pcw.cpp
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// license:GPL-2.0+
// copyright-holders:Kevin Thacker
/******************************************************************************
pcw.cpp
system driver
Kevin Thacker [MESS driver]
Thankyou to Jacob Nevins, Richard Fairhurst and Cliff Lawson,
for their documentation that I used for the development of this
driver.
PCW came in 4 forms.
PCW8256, PCW8512, PCW9256, PCW9512
These systems were nicknamed "Joyce", apparently after a secretary who worked at
Amstrad plc.
These machines were designed for wordprocessing and other business applications.
The computer came with Locoscript (wordprocessor by Locomotive Software Ltd),
and CP/M+ (3.1).
The original PCW8256 system came with a keyboard, green-screen monitor
(which had 2 3" 80 track, double sided disc drives mounted vertically in it),
and a dedicated printer. The other systems had different design but shared the
same hardware.
Since it was primarily designed as a wordprocessor, there were not many games
written.
Some of the games available:
- Head Over Heels
- Infocom adventures (Hitchhikers Guide to the Galaxy etc)
However, it can use the CP/M OS, there is a large variety of CPM software that will
run on it!!!!!!!!!!!!!!
Later systems had:
- black/white monitor,
- dedicated printer was removed, and support for any printer was added
- 3" internal drive replaced by a 3.5" drive
All the logic for the system, except the FDC was found in a Amstrad designed custom
chip.
In the original PCW8256, there was no boot-rom. A boot-program was stored in the printer
chip, and this was activated when the PCW was first switched on. AFAIK there are no
dumps of this program, so I have written my own replacement.
The boot-program performs a simple task: Load sector 0, track 0 to &f000 in ram, and execute
&f010.
From here CP/M is booted, and the appropriate programs can be run.
The hardware:
- Z80 CPU running at 3.4 MHz
- UPD765 FDC
- mono display
- beep (a fixed Hz tone which can be turned on/off)
- 720x256 (PAL) bitmapped display, 720x200 (NTSC) bitmapped display
- Amstrad CPC6128 style keyboard
If there are special roms for any of the PCW series I would be interested in them
so I can implement the driver properly.
From comp.sys.amstrad.8bit FAQ:
"Amstrad made the following PCW systems :
- 1) PCW8256
- 2) PCW8512
- 3) PCW9512
- 4) PCW9512+
- 5) PcW10
- 6) PcW16
1 had 180K drives, 2 had a 180K A drive and a 720K B drive, 3 had only
720K drives. All subsequent models had 3.5" disks using CP/M format at
720K until 6 when it switched to 1.44MB in MS-DOS format. The + of
model 4 was that it had a "real" parallel interface so could be sold
with an external printer such as the Canon BJ10. The PcW10 wasn't
really anything more than 4 in a more modern looking case.
The PcW16 is a radical digression who's sole "raison d'etre" was to
make a true WYSIWYG product but this meant a change in the screen and
processor (to 16MHz) etc. which meant that it could not be kept
compatible with the previous models (though documents ARE compatible)"
TODO:
- Printer hardware emulation (8256 etc)
- Parallel port emulation (9512, 9512+, 10)
- emulation of serial hardware
- emulation of other hardware...?
******************************************************************************/
#include "emu.h"
// pcw video hardware
#include "pcw.h"
#include "cpu/z80/z80.h"
#include "machine/i8243.h"
#include "machine/upd765.h"
// pcw/pcw16 beeper
#include "sound/beep.h"
#include "machine/ram.h"
#include "machine/rescap.h"
#include "render.h"
#include "softlist_dev.h"
#include "speaker.h"
#include "pcw.lh"
#define LOG_PRN (1U << 1)
#define LOG_STROBE (1U << 2)
#define LOG_PAR (1U << 3)
#define LOG_EXP (1U << 4)
#define LOG_MEM (1U << 5)
#define LOG_SYS (1U << 6)
#define LOG_BANK (1U << 7)
#define LOG_RRAM (1U << 8)
#define LOG_IRQ (1U << 9)
//#define VERBOSE (LOG_SYS)
//#define LOG_OUTPUT_FUNC printf
#include "logmacro.h"
#define LOGPRN(...) LOGMASKED(LOG_PRN, __VA_ARGS__)
#define LOGSTROBE(...) LOGMASKED(LOG_STROBE, __VA_ARGS__)
#define LOGPAR(...) LOGMASKED(LOG_PAR, __VA_ARGS__)
#define LOGEXP(...) LOGMASKED(LOG_EXP, __VA_ARGS__)
#define LOGMEM(...) LOGMASKED(LOG_MEM, __VA_ARGS__)
#define LOGSYS(...) LOGMASKED(LOG_SYS, __VA_ARGS__)
#define LOGBANK(...) LOGMASKED(LOG_BANK, __VA_ARGS__)
#define LOGRRAM(...) LOGMASKED(LOG_RRAM, __VA_ARGS__)
#define LOGIRQ(...) LOGMASKED(LOG_IRQ, __VA_ARGS__)
static const uint8_t half_step_table[4] = { 0x01, 0x02, 0x04, 0x08 };
static const uint8_t full_step_table[4] = { 0x03, 0x06, 0x0c, 0x09 };
void pcw_state::pcw_update_interrupt_counter()
{
/* never increments past 15! */
if (m_interrupt_counter==0x0f)
return;
/* increment count */
m_interrupt_counter++;
}
// set/reset INT and NMI lines
void pcw_state::pcw_update_irqs()
{
// set NMI line, remains set until FDC interrupt type is changed
if(m_nmi_flag != 0)
m_maincpu->set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
else
m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
// set IRQ line, timer pulses IRQ line, all other devices hold it as necessary
if(m_fdc_interrupt_code == 1 && (m_system_status & 0x20))
{
m_maincpu->set_input_line(0, ASSERT_LINE);
return;
}
if(m_timer_irq_flag != 0)
{
m_maincpu->set_input_line(0, ASSERT_LINE);
return;
}
m_maincpu->set_input_line(0, CLEAR_LINE);
}
TIMER_CALLBACK_MEMBER(pcw_state::pcw_timer_pulse)
{
m_timer_irq_flag = 0;
pcw_update_irqs();
}
/* callback for 1/300ths of a second interrupt */
TIMER_DEVICE_CALLBACK_MEMBER(pcw_state::pcw_timer_interrupt)
{
pcw_update_interrupt_counter();
m_timer_irq_flag = 1;
pcw_update_irqs();
m_pulse_timer->adjust(attotime::from_usec(100), 0, attotime::from_usec(100));
}
/* PCW uses UPD765 in NON-DMA mode. FDC Ints are connected to /INT or
* /NMI depending on choice (see system control below)
* fdc interrupt callback. set/clear fdc int */
void pcw_state::pcw_fdc_interrupt(int state)
{
if (!state)
m_system_status &= ~(1<<5);
else
{
m_system_status |= (1<<5);
if(m_fdc_interrupt_code == 0) // NMI is held until interrupt type is changed
m_nmi_flag = 1;
}
}
/* Memory is banked in 16k blocks.
The upper 16 bytes of block 3, contains the keyboard
state. This is updated by the hardware.
block 3 could be paged into any bank, and this explains the
setup of the memory below.
*/
void pcw_state::pcw_map(address_map &map)
{
map(0x0000, 0x3fff).bankr(m_rdbanks[0]).bankw(m_wrbanks[0]);
map(0x4000, 0x7fff).bankr(m_rdbanks[1]).bankw(m_wrbanks[1]);
map(0x8000, 0xbfff).bankr(m_rdbanks[2]).bankw(m_wrbanks[2]);
map(0xc000, 0xffff).bankr(m_rdbanks[3]).bankw(m_wrbanks[3]);
}
/* Keyboard is read by the MCU and sent as serial data to the gate array ASIC */
uint8_t pcw_state::pcw_keyboard_r(offs_t offset)
{
return m_iptlines[offset]->read();
}
uint8_t pcw_state::pcw_keyboard_data_r(offs_t offset)
{
return m_mcu_keyboard_data[offset];
}
/* -----------------------------------------------------------------------
* PCW Banking
* ----------------------------------------------------------------------- */
void pcw_state::pcw_update_read_memory_block(int block, int bank)
{
address_space &space = m_maincpu->space(AS_PROGRAM);
/* bank 3? */
if (bank == 3)
{
/* when upper 16 bytes are accessed use keyboard read handler */
space.install_read_handler( block * 0x04000 + 0x3ff0, block * 0x04000 + 0x3fff, read8sm_delegate(*this, FUNC(pcw_state::pcw_keyboard_data_r)));
LOGMEM("MEM: read block %i -> bank %i\n", block, bank);
}
else
{
/* restore bank handler across entire block */
space.install_read_bank(block * 0x04000 + 0x0000, block * 0x04000 + 0x3fff, m_rdbanks[block].target());
LOGMEM("MEM: read block %i -> bank %i\n", block, bank);
}
m_rdbanks[block]->set_base(m_ram->pointer() + ((bank * 0x4000) % m_ram->size()));
}
void pcw_state::pcw_update_write_memory_block(int block, int bank)
{
m_wrbanks[block]->set_base(m_ram->pointer() + ((bank * 0x4000) % m_ram->size()));
LOGMEM("MEM: write block %i -> bank %i\n", block, bank);
}
/* ----------------------------------------------------------------------- */
/* &F4 O b7-b4: when set, force memory reads to access the same bank as
writes for &C000, &0000, &8000, and &4000 respectively */
void pcw_state::pcw_update_mem(int block, int data)
{
/* expansion ram select.
if block is 0-7, selects internal ram instead for read/write
*/
if (data & 0x080)
{
int bank;
/* same bank for reading and writing */
bank = data & 0x7f;
pcw_update_read_memory_block(block, bank);
pcw_update_write_memory_block(block, bank);
}
else
{
/* specify a different bank for reading and writing */
int write_bank;
int read_bank;
int mask=0;
switch (block)
{
case 0:
{
mask = (1<<6);
}
break;
case 1:
{
mask = (1<<4);
}
break;
case 2:
{
mask = (1<<5);
}
break;
case 3:
{
mask = (1<<7);
}
break;
}
if (m_bank_force & mask)
{
read_bank = data & 0x07;
}
else
{
read_bank = (data>>4) & 0x07;
}
pcw_update_read_memory_block(block, read_bank);
write_bank = data & 0x07;
pcw_update_write_memory_block(block, write_bank);
}
/* if boot is active, page in fake ROM */
/* if ((m_boot) && (block==0))
{
unsigned char *FakeROM;
FakeROM = &memregion("maincpu")->base()[0x010000];
m_rdbanks[0]->set_base(FakeROM);
}*/
}
/* from Jacob Nevins docs */
int pcw_state::pcw_get_sys_status()
{
return
m_interrupt_counter
| (m_screen->vblank() ? 0x40 : 0x00)
| (ioport("EXTRA")->read() & 0x010)
| (m_system_status & 0x20);
}
uint8_t pcw_state::pcw_interrupt_counter_r()
{
int data;
/* from Jacob Nevins docs */
/* get data */
data = pcw_get_sys_status();
/* clear int counter */
m_interrupt_counter = 0;
/* check interrupts */
pcw_update_irqs();
/* return data */
LOGIRQ("IRQ counter read, returning %02x\n", data);
return data;
}
void pcw_state::pcw_bank_select_w(offs_t offset, uint8_t data)
{
LOGBANK("BANK: %2x %x\n", offset, data);
m_banks[offset] = data;
pcw_update_mem(offset, data);
LOGBANK("RAM Banks: %02x %02x %02x %02x Lock:%02x",m_banks[0],m_banks[1],m_banks[2],m_banks[3],m_bank_force);
}
void pcw_state::pcw_bank_force_selection_w(uint8_t data)
{
m_bank_force = data;
pcw_update_mem(0, m_banks[0]);
pcw_update_mem(1, m_banks[1]);
pcw_update_mem(2, m_banks[2]);
pcw_update_mem(3, m_banks[3]);
}
void pcw_state::pcw_roller_ram_addr_w(uint8_t data)
{
/*
Address of roller RAM. b7-5: bank (0-7). b4-1: address / 512. */
m_roller_ram_addr = (((data>>5) & 0x07)<<14) |
((data & 0x01f)<<9);
LOGRRAM("Roller-RAM: Address set to 0x%05x\n", m_roller_ram_addr);
}
void pcw_state::pcw_pointer_table_top_scan_w(uint8_t data)
{
m_roller_ram_offset = data;
LOGRRAM("Roller-RAM: offset set to 0x%05x\n", m_roller_ram_offset);
}
void pcw_state::pcw_vdu_video_control_register_w(uint8_t data)
{
m_vdu_video_control_register = data;
LOGRRAM("Roller-RAM: control reg set to 0x%02x\n", data);
}
void pcw_state::pcw_system_control_w(uint8_t data)
{
LOGSYS("SYSTEM CONTROL: %d\n", data);
switch (data)
{
/* end bootstrap */
case 0:
{
m_boot = 0;
pcw_update_mem(0, m_banks[0]);
}
break;
/* reboot */
case 1:
{
m_maincpu->pulse_input_line(INPUT_LINE_NMI, attotime::zero);
LOGSYS("SYS: Reboot");
}
break;
/* connect fdc interrupt to nmi */
case 2:
{
int fdc_previous_interrupt_code = m_fdc_interrupt_code;
m_fdc_interrupt_code = 0;
/* previously connected to INT? */
if (fdc_previous_interrupt_code == 1)
{
/* yes */
pcw_update_irqs();
}
}
break;
/* connect fdc interrupt to interrupt */
case 3:
{
int fdc_previous_interrupt_code = m_fdc_interrupt_code;
/* connect to INT */
m_fdc_interrupt_code = 1;
/* previously connected to NMI? */
if (fdc_previous_interrupt_code == 0)
{
/* yes */
/* clear nmi interrupt */
m_nmi_flag = 0;
}
/* re-issue interrupt */
pcw_update_irqs();
}
break;
/* connect fdc interrupt to neither */
case 4:
{
int fdc_previous_interrupt_code = m_fdc_interrupt_code;
m_fdc_interrupt_code = 2;
/* previously connected to NMI or INT? */
if ((fdc_previous_interrupt_code == 0) || (fdc_previous_interrupt_code == 1))
{
/* yes */
/* Clear NMI */
m_nmi_flag = 0;
}
pcw_update_irqs();
}
break;
/* set fdc terminal count */
case 5:
{
m_fdc->tc_w(true);
}
break;
/* clear fdc terminal count */
case 6:
{
m_fdc->tc_w(false);
}
break;
/* screen on */
case 7:
{
}
break;
/* screen off */
case 8:
{
}
break;
/* disc motor on */
case 9:
{
floppy_image_device *floppy;
floppy = m_floppy[0]->get_device();
if(floppy)
floppy->mon_w(0);
floppy = m_floppy[1]->get_device();
if(floppy)
floppy->mon_w(0);
}
break;
/* disc motor off */
case 10:
{
floppy_image_device *floppy;
floppy = m_floppy[0]->get_device();
if(floppy)
floppy->mon_w(1);
floppy = m_floppy[1]->get_device();
if(floppy)
floppy->mon_w(1);
}
break;
/* beep on */
case 11:
{
m_beeper->set_state(1);
}
break;
/* beep off */
case 12:
{
m_beeper->set_state(0);
}
break;
}
}
uint8_t pcw_state::pcw_system_status_r()
{
/* from Jacob Nevins docs */
uint8_t ret = pcw_get_sys_status();
return ret;
}
/* read from expansion hardware - additional hardware not part of
the PCW custom ASIC */
uint8_t pcw_state::pcw_expansion_r(offs_t offset)
{
LOGEXP("pcw expansion r: %04x\n", offset+0x080);
switch (offset+0x080)
{
case 0x0e0:
{
/* spectravideo joystick */
if (ioport("EXTRA")->read() & 0x020)
{
return ioport("SPECTRAVIDEO")->read();
}
else
{
return 0x0ff;
}
}
case 0x09f:
{
/* kempston joystick */
return ioport("KEMPSTON")->read();
}
case 0x0e1:
case 0x0e3:
{
return 0x7f;
}
case 0x085:
{
return 0x0fe;
}
case 0x087:
{
return 0x0ff;
}
}
/* result from floating bus/no peripheral at this port */
return 0x0ff;
}
/* write to expansion hardware - additional hardware not part of
the PCW custom ASIC */
void pcw_state::pcw_expansion_w(offs_t offset, uint8_t data)
{
LOGEXP("pcw expansion w: %04x %02x\n", offset+0x080, data);
}
void pcw_state::pcw_printer_fire_pins(uint16_t pins)
{
int x,line;
int32_t feed = (m_paper_feed / 2);
for(x=feed+PCW_PRINTER_HEIGHT-16;x<feed+PCW_PRINTER_HEIGHT-7;x++)
{
line = x % PCW_PRINTER_HEIGHT;
if((pins & 0x01) == 0)
m_prn_output->pix(line, m_printer_headpos) = (uint16_t)(pins & 0x01);
pins >>= 1;
}
// if(m_printer_headpos < PCW_PRINTER_WIDTH)
// m_printer_headpos++;
}
// print error type
// should return 0xF8 if there are no errors
// 0 = underrun
// 1 = printer controller RAM fault
// 3 = bad command
// 5 = print error
// anything else = no printer
// printer status
// bit 7 - bail bar in
// bit 6 - not currently executing a command
// bit 5 - printer RAM is full
// bit 4 - print head is not at left margin
// bit 3 - sheet feeder is present
// bit 2 - paper is present
// bit 1 - busy
// bit 0 - controller fault
/* MCU handlers */
/* I/O ports: (likely to be completely wrong...)
* (write)
* all are active low
* P1: pins 0-7
* P2 bit 0: pin 8
* P2 bit 1: serial shift/store clock
* P2 bit 2: serial shift store data
* P2 bit 3: serial shift/store strobe
* P2 bit 4: print head motor
* P2 bit 5: paper feed motor
* P2 bit 6: fire pins
* (read)
* P2 bit 7: bail bar status (0 if out)
* T0: Paper sensor (?)
* T1: Print head location (1 if not at left margin)
*/
TIMER_CALLBACK_MEMBER(pcw_state::pcw_stepper_callback)
{
LOGPRN("PRN: P2 bits %s %s %s\nSerial: %02x\nHeadpos: %i",
m_printer_p2 & 0x40 ? " " : "6",
m_printer_p2 & 0x20 ? " " : "5",
m_printer_p2 & 0x10 ? " " : "4",
m_printer_shift_output,m_printer_headpos);
if((m_printer_p2 & 0x10) == 0) // print head motor active
{
uint8_t stepper_state = (m_printer_shift_output >> 4) & 0x0f;
if(stepper_state == full_step_table[(m_head_motor_state + 1) & 0x03])
{
m_printer_headpos += 2;
m_head_motor_state++;
LOGPRN("Printer head moved forward by 2 to %i\n", m_printer_headpos);
}
if(stepper_state == half_step_table[(m_head_motor_state + 1) & 0x03])
{
m_printer_headpos += 1;
m_head_motor_state++;
LOGPRN("Printer head moved forward by 1 to %i\n", m_printer_headpos);
}
if(stepper_state == full_step_table[(m_head_motor_state - 1) & 0x03])
{
m_printer_headpos -= 2;
m_head_motor_state--;
LOGPRN("Printer head moved back by 2 to %i\n", m_printer_headpos);
}
if(stepper_state == half_step_table[(m_head_motor_state - 1) & 0x03])
{
m_printer_headpos -= 1;
m_head_motor_state--;
LOGPRN("Printer head moved back by 1 to %i\n", m_printer_headpos);
}
if(m_printer_headpos < 0)
m_printer_headpos = 0;
if(m_printer_headpos > PCW_PRINTER_WIDTH)
m_printer_headpos = PCW_PRINTER_WIDTH;
m_head_motor_state &= 0x03;
m_printer_p2 |= 0x10;
}
if((m_printer_p2 & 0x20) == 0) // line feed motor active
{
uint8_t stepper_state = m_printer_shift_output & 0x0f;
if(stepper_state == full_step_table[(m_linefeed_motor_state + 1) & 0x03])
{
m_paper_feed++;
if(m_paper_feed > PCW_PRINTER_HEIGHT*2)
m_paper_feed = 0;
m_linefeed_motor_state++;
}
if(stepper_state == half_step_table[(m_linefeed_motor_state + 1) & 0x03])
{
m_paper_feed++;
if(m_paper_feed > PCW_PRINTER_HEIGHT*2)
m_paper_feed = 0;
m_linefeed_motor_state++;
}
m_linefeed_motor_state &= 0x03;
m_printer_p2 |= 0x20;
}
}
TIMER_CALLBACK_MEMBER(pcw_state::pcw_pins_callback)
{
pcw_printer_fire_pins(m_printer_pins);
m_printer_p2 |= 0x40;
}
uint8_t pcw_state::mcu_printer_p1_r()
{
LOGPRN("PRN: MCU reading data from P1\n");
return m_printer_pins & 0x00ff;
}
void pcw_state::mcu_printer_p1_w(uint8_t data)
{
m_printer_pins = (m_printer_pins & 0x0100) | data;
LOGPRN("PRN: Print head position = %i", m_printer_headpos);
LOGPRN("PRN: MCU writing %02x to P1 [%03x/%03x]\n", data,m_printer_pins, ~m_printer_pins & 0x1ff);
}
uint8_t pcw_state::mcu_printer_p2_r()
{
uint8_t ret = 0x00;
LOGPRN("PRN: MCU reading data from P2\n");
ret |= 0x80; // make sure bail bar is in
ret |= (m_printer_p2 & 0x70);
ret |= (m_printer_pins & 0x100) ? 0x01 : 0x00; // ninth pin
ret |= 0x0e;
return ret;
}
void pcw_state::mcu_printer_p2_w(uint8_t data)
{
LOGPRN("PRN: MCU writing %02x to P2\n", data);
m_printer_p2 = data & 0x70;
// handle shift/store
m_printer_serial = data & 0x04; // data
if((data & 0x02) != 0) // clock
{
m_printer_shift <<= 1;
if(m_printer_serial == 0)
m_printer_shift &= ~0x01;
else
m_printer_shift |= 0x01;
}
if((data & 0x08) != 0) // strobe
{
LOGSTROBE("Strobe active [%02x]\n",m_printer_shift);
m_printer_shift_output = m_printer_shift;
m_prn_stepper->adjust(PERIOD_OF_555_MONOSTABLE(22000,0.00000001));
}
if(data & 0x40)
m_prn_pins->adjust(PERIOD_OF_555_MONOSTABLE(22000,0.0000000068));
if(data & 0x01)
m_printer_pins |= 0x0100;
else
m_printer_pins &= ~0x0100;
m_printer_p2_prev = data;
}
// Paper sensor
int pcw_state::mcu_printer_t1_r()
{
return 1;
}
// Print head location (0 if at left margin, otherwise 1)
int pcw_state::mcu_printer_t0_r()
{
if(m_printer_headpos == 0)
return 0;
else
return 1;
}
/*
* Keyboard MCU (i8048)
* P1 = keyboard scan row select (low 8 bits)
* P2 = bits 7-4: keyboard scan row select (high 4 bits)
* bit 1: keyboard serial clock
* bit 0: keyboard serial data
*/
void pcw_state::mcu_transmit_serial(uint8_t bit)
{
int seq;
/* Keyboard data is sent in serial from the MCU through the keyboard port, to the ASIC
Sends a string of 12-bit sequences, first 4 bits are the RAM location (from &3ff0),
then 8 bits for the data to be written there. */
seq = m_mcu_transmit_count % 12;
if(seq < 4)
{
if(bit == 0)
m_mcu_selected &= ~(8 >> seq);
else
m_mcu_selected |= (8 >> seq);
}
else
{
seq -= 4;
if(bit == 0)
m_mcu_buffer &= ~(128 >> seq);
else
m_mcu_buffer |= (128 >> seq);
}
m_mcu_transmit_count++;
if(m_mcu_transmit_count >= 12)
{
m_mcu_keyboard_data[m_mcu_selected] = m_mcu_buffer;
m_mcu_transmit_count = 0;
}
}
uint8_t pcw_state::mcu_kb_scan_r()
{
return m_kb_scan_row & 0xff;
}
void pcw_state::mcu_kb_scan_w(uint8_t data)
{
m_kb_scan_row = (m_kb_scan_row & 0xff00) | data;
}
uint8_t pcw_state::mcu_kb_scan_high_r()
{
return (m_kb_scan_row & 0xff00) >> 8;
}
void pcw_state::mcu_kb_scan_high_w(uint8_t data)
{
if((m_mcu_prev & 0x02) && !(data & 0x02)) // bit is transmitted on high-to-low clock transition
{
mcu_transmit_serial(data & 0x01);
m_mcu_transmit_reset_seq = 0;
}
if((m_mcu_prev & 0x01) != (data & 0x01)) // two high->low transitions on the data pin signals the beginning of a new transfer
{
m_mcu_transmit_reset_seq++;
if(m_mcu_transmit_reset_seq > 3)
m_mcu_transmit_count = 0;
}
m_kb_scan_row = (m_kb_scan_row & 0x00ff) | ((data & 0xff) << 8);
m_mcu_prev = data;
}
uint8_t pcw_state::mcu_kb_data_r()
{
uint16_t scan_bits = ((m_kb_scan_row & 0xf000) >> 4) | (m_kb_scan_row & 0xff);
int x;
for(x=0;x<12;x++)
{
if(!(scan_bits & 1))
return pcw_keyboard_r(x);
else
scan_bits >>= 1;
}
return 0xff;
}
int pcw_state::mcu_kb_t1_r()
{
return 1;
}
int pcw_state::mcu_kb_t0_r()
{
return 0;
}
/* TODO: Implement parallel port! */
uint8_t pcw_state::pcw9512_parallel_r(offs_t offset)
{
if (offset==1)
{
return 0xff^0x020;
}
LOGPAR("pcw9512 parallel r: offs: %04x\n", (int) offset);
return 0x00;
}
/* TODO: Implement parallel port! */
void pcw_state::pcw9512_parallel_w(offs_t offset, uint8_t data)
{
LOGPAR("pcw9512 parallel w: offs: %04x data: %02x\n", offset, data);
}
void pcw_state::pcw_io(address_map &map)
{
map.global_mask(0xff);
map(0x000, 0x001).mirror(0x7e).m(m_fdc, FUNC(upd765a_device::map));
map(0x080, 0x0ef).rw(FUNC(pcw_state::pcw_expansion_r), FUNC(pcw_state::pcw_expansion_w));
map(0x0f0, 0x0f3).w(FUNC(pcw_state::pcw_bank_select_w));
map(0x0f4, 0x0f4).rw(FUNC(pcw_state::pcw_interrupt_counter_r), FUNC(pcw_state::pcw_bank_force_selection_w));
map(0x0f5, 0x0f5).w(FUNC(pcw_state::pcw_roller_ram_addr_w));
map(0x0f6, 0x0f6).w(FUNC(pcw_state::pcw_pointer_table_top_scan_w));
map(0x0f7, 0x0f7).w(FUNC(pcw_state::pcw_vdu_video_control_register_w));
map(0x0f8, 0x0f8).rw(FUNC(pcw_state::pcw_system_status_r), FUNC(pcw_state::pcw_system_control_w));
map(0x0fc, 0x0fd).rw(m_printer_mcu, FUNC(upi41_cpu_device::upi41_master_r), FUNC(upi41_cpu_device::upi41_master_w));
}
void pcw_state::pcw9512_io(address_map &map)
{
map.global_mask(0xff);
map(0x000, 0x001).mirror(0x7e).m(m_fdc, FUNC(upd765a_device::map));
map(0x080, 0x0ef).rw(FUNC(pcw_state::pcw_expansion_r), FUNC(pcw_state::pcw_expansion_w));
map(0x0f0, 0x0f3).w(FUNC(pcw_state::pcw_bank_select_w));
map(0x0f4, 0x0f4).rw(FUNC(pcw_state::pcw_interrupt_counter_r), FUNC(pcw_state::pcw_bank_force_selection_w));
map(0x0f5, 0x0f5).w(FUNC(pcw_state::pcw_roller_ram_addr_w));
map(0x0f6, 0x0f6).w(FUNC(pcw_state::pcw_pointer_table_top_scan_w));
map(0x0f7, 0x0f7).w(FUNC(pcw_state::pcw_vdu_video_control_register_w));
map(0x0f8, 0x0f8).rw(FUNC(pcw_state::pcw_system_status_r), FUNC(pcw_state::pcw_system_control_w));
map(0x0fc, 0x0fd).rw(FUNC(pcw_state::pcw9512_parallel_r), FUNC(pcw_state::pcw9512_parallel_w));
}
TIMER_CALLBACK_MEMBER(pcw_state::setup_beep)
{
m_beeper->set_state(0);
}
void pcw_state::machine_start()
{
m_fdc_interrupt_code = 2;
m_vdu_video_control_register = 0;
m_nmi_flag = 0;
}
void pcw_state::machine_reset()
{
uint8_t* code = memregion("printer_mcu")->base();
int x;
/* ram paging is actually undefined at power-on */
m_bank_force = 0xf0; // banks are locked for CPC-style paging - Batman expects this
m_banks[0] = 0x80;
m_banks[1] = 0x81;
m_banks[2] = 0x82;
m_banks[3] = 0x83;
pcw_update_mem(0, m_banks[0]);
pcw_update_mem(1, m_banks[1]);