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io.cpp
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io.cpp
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/*
EPSON HC-80 Emulator 'eHC-80'
Author : Takeda.Toshiya
Date : 2008.03.14 -
[ i/o ]
*/
#include "io.h"
#include "../beep.h"
#include "../ptf20.h"
#include "../../fifo.h"
//#define OUT_CMD_LOG
// interrupt bits
#define BIT_7508 0x01
#define BIT_8251 0x02
#define BIT_CD 0x04
#define BIT_ICF 0x08
#define BIT_OVF 0x10
#define BIT_EXT 0x20
// 6303
#define BIT_OBF 0x01
#define BIT_IBF 0x02
#define BIT_F1 0x08
#define RCD00 0
#define RCD01 1
#define RCD02 2
#define RCD03 3
#define RCD04 11
#define RCD05 12
#define RCD06 13
#define RCD07 41
#define RCD08 42
#define RCD09 43
#define RCD10 44
#define RCD11 45
#define RCD11_1 46
#define RCD12 61
#define RCD13 62
#define RCD14 63
#define RCD15 71
// TF-20
#define DID_FIRST 0x31
#define DS_SEL 0x05
#define SOH 0x01
#define STX 0x02
#define EOT 0x04
#define ACK 0x06
// intelligent ram disk
#define IRAMDISK_WAIT 1
#define IRAMDISK_IN 0
#define IRAMDISK_OUT 1
#define EVENT_FRC 0
#define EVENT_1SEC 1
#define EVENT_6303 2
static const int key_tbl[256] = {
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x56,0x57,0xff,0xff,0xff,0x71,0xff,0xff,
0xb3,0xb2,0xff,0x10,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00,0xff,0xff,0xff,0xff,
0x73,0xff,0xff,0xff,0xff,0x63,0x55,0x65,0x64,0xff,0xff,0xff,0xff,0x80,0x81,0xff,
0x52,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x50,0x51,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0x66,0x40,0x76,0x30,0x22,0x31,0x32,0x33,0x27,0x34,0x35,0x36,0x42,0x41,0x60,
0x61,0x20,0x23,0x67,0x24,0x26,0x77,0x21,0x75,0x25,0x74,0xff,0xff,0xff,0xff,0xff,
0x52,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x50,0x51,0xff,0xff,0xff,0xff,0xff,0xff,
0x03,0x04,0x05,0x06,0x07,0xff,0xff,0xff,0xff,0xff,0x01,0x02,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x70,0x37,0x43,0x53,0x44,0x45,
0x62,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x46,0x72,0x47,0x54,0xff,
0xff,0xff,0x72,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff
};
static const uint8_t dot_tbl[8] = {
0x80, 0x40, 0x20, 0x10, 8, 4, 2, 1
};
void IO::initialize()
{
// config
device_type = config.device_type;
// init ram and external ram disk
memset(ram, 0, sizeof(ram));
memset(ext, 0, 0x20000);
memset(ext + 0x20000, 0xff, 0x20000);
extar = 0;
extcr = 0;
// load images
FILEIO* fio = new FILEIO();
if(fio->Fopen(create_local_path(_T("BASIC.ROM")), FILEIO_READ_BINARY)) {
fio->Fread(basic, 0x4000, 1);
memcpy(basic + 0x4000, basic, 0x4000);
fio->Fread(basic + 0x4000, 0x4000, 1);
fio->Fclose();
}
if(fio->Fopen(create_local_path(_T("UTIL.ROM")), FILEIO_READ_BINARY)) {
fio->Fread(util, 0x4000, 1);
memcpy(util + 0x4000, util, 0x4000);
fio->Fread(util + 0x4000, 0x4000, 1);
fio->Fclose();
}
if(fio->Fopen(create_local_path(_T("VRAM.BIN")), FILEIO_READ_BINARY)) {
fio->Fread(ram + 0x8000, 0x1800, 1);
fio->Fclose();
}
if(fio->Fopen(create_local_path(_T("EXTRAM.BIN")), FILEIO_READ_BINARY)) {
fio->Fread(ext, 0x20000, 1);
fio->Fclose();
}
if(fio->Fopen(create_local_path(_T("INTRAM.BIN")), FILEIO_READ_BINARY)) {
fio->Fread(iramdisk_sectors, sizeof(iramdisk_sectors), 1);
fio->Fclose();
}
if(fio->Fopen(create_local_path(_T("EXT.ROM")), FILEIO_READ_BINARY)) {
fio->Fread(ext + 0x20000, 0x20000, 1);
fio->Fclose();
}
if(fio->Fopen(create_local_path(_T("FONT.ROM")), FILEIO_READ_BINARY)) {
fio->Fread(font, sizeof(font), 1);
fio->Fclose();
}
delete fio;
// init sub cpu
cmd6303_buf = new FIFO(1024);
rsp6303_buf = new FIFO(1024);
tf20_buf = new FIFO(1024);
cmd7508_buf = new FIFO(16);
rsp7508_buf = new FIFO(16);
key_buf = new FIFO(7);
// set pallete
pd = RGB_COLOR(48, 56, 16);
pb = RGB_COLOR(160, 168, 160);
// init 7508
get_host_time(&cur_time);
onesec_intr = alarm_intr = false;
onesec_intr_enb = alarm_intr_enb = kb_intr_enb = true;
res_7508 = kb_caps = false;
// register events
register_frame_event(this);
register_event_by_clock(this, EVENT_FRC, 0x40000, true, NULL);
register_event_by_clock(this, EVENT_1SEC, CPU_CLOCKS, true, ®ister_id);
register_event_by_clock(this, EVENT_6303, 100, true, NULL);
}
void IO::release()
{
// save external ram disk
FILEIO* fio = new FILEIO();
if(fio->Fopen(create_local_path(_T("VRAM.BIN")), FILEIO_WRITE_BINARY)) {
fio->Fwrite(ram + 0x8000, 0x1800, 1);
fio->Fclose();
}
if(fio->Fopen(create_local_path(_T("EXTRAM.BIN")), FILEIO_WRITE_BINARY)) {
fio->Fwrite(ext, 0x20000, 1);
fio->Fclose();
}
if(fio->Fopen(create_local_path(_T("INTRAM.BIN")), FILEIO_WRITE_BINARY)) {
fio->Fwrite(iramdisk_sectors, sizeof(iramdisk_sectors), 1);
fio->Fclose();
}
delete fio;
cmd6303_buf->release();
delete cmd6303_buf;
rsp6303_buf->release();
delete rsp6303_buf;
tf20_buf->release();
delete tf20_buf;
cmd7508_buf->release();
delete cmd7508_buf;
rsp7508_buf->release();
delete rsp7508_buf;
key_buf->release();
delete key_buf;
}
void IO::reset()
{
// reset gapnit
bcr = slbcr = isr = ier = ioctlr = 0;
icrc = icrb = 0;
ear = beep = false;
res_z80 = true;
key_buf->clear();
// reset 6303
psr = 0;
cs_addr = 0x8100;
gs_addr = 0x9500;
lcd_on = true;
scr_mode = 1;
num_lines = 0;
flash_block = 0;
cs_blocks = gs_blocks = 0;
memset(cs_block, 0, sizeof(cs_block));
memset(gs_block, 0, sizeof(gs_block));
memset(udgc, 0, sizeof(udgc));
wnd_ptr_x = wnd_ptr_y = 0;
blink = 0;
// reset intelligent ram disk
iramdisk_count = 0;
iramdisk_ptr = iramdisk_buf;
}
void IO::sysreset()
{
// reset 7508
onesec_intr = alarm_intr = false;
onesec_intr_enb = alarm_intr_enb = kb_intr_enb = true;
res_7508 = true;
}
void IO::write_signal(int id, uint32_t data, uint32_t mask)
{
if(id == SIG_IO_RXRDY) {
// notify rxrdy is changed from i8251
if(data & mask) {
isr |= BIT_8251;
} else {
isr &= ~BIT_8251;
}
update_intr();
} else if(id == SIG_IO_BARCODE) {
// signal from barcode reader
if(!slbcr) {
bool next = ((data & mask) != 0);
if((bcr == 2 && ear && !next) || (bcr == 4 && !ear && next) || (bcr == 6 && ear != next)) {
icrb = get_passed_clock(cur_clock) / 4;
isr |= BIT_ICF;
update_intr();
}
ear = next;
}
} else if(id == SIG_IO_TF20) {
// recv from tf20
tf20_buf->write(data);
}
}
void IO::event_frame()
{
d_beep->write_signal(SIG_BEEP_ON, beep ? 1 : 0, 1);
beep = false;
blink++;
}
void IO::event_callback(int event_id, int err)
{
if(event_id == EVENT_FRC) {
// FRC overflow event
cur_clock = get_current_clock();
isr |= BIT_OVF;
update_intr();
} else if(event_id == EVENT_1SEC) {
// update rtc
if(cur_time.initialized) {
cur_time.increment();
} else {
get_host_time(&cur_time); // resync
cur_time.initialized = true;
}
onesec_intr = true;
if(onesec_intr_enb) {
isr |= BIT_7508;
update_intr();
}
} else if(event_id == EVENT_6303) {
// communicate between z80 and 6303
if(psr & BIT_OBF) {
psr &= ~BIT_OBF;
process_6303();
}
if(!rsp6303_buf->empty()) {
psr |= BIT_IBF;
}
}
}
void IO::write_io8(uint32_t addr, uint32_t data)
{
//this->out_debug_log(_T("OUT %2x,%2x\n"), addr & 0xff, data);
switch(addr & 0xff) {
case 0x00:
// CTLR1
bcr = data & 6;
d_mem->write_signal(0, data, 1);
break;
case 0x01:
// CMDR
if(data & 4) {
isr &= ~BIT_OVF;
update_intr();
}
//if(data & 2) {
// rdysio = false;
//}
//if(data & 1) {
// rdysio = true;
//}
break;
case 0x02:
// CTLR2
break;
case 0x04:
// IER
ier = data;
break;
case 0x06:
// SIOR
send_to_7508(data);
break;
case 0x0c:
// 8251 data write
d_sio->write_io8(0, data);
break;
case 0x0d:
// 8251 command write
d_sio->write_io8(1, data);
break;
case 0x0e:
// 6303 send data
cmd6303_buf->write(data);
psr |= BIT_OBF;
#ifdef OUT_CMD_LOG
this->out_debug_log(_T("%4x\tDAT %2x\n"), get_cpu_pc(0), data);
#endif
break;
case 0x0f:
// 6303 send command
cmd6303 = data;
psr |= BIT_OBF;
#ifdef OUT_CMD_LOG
this->out_debug_log(_T("\n%4x\tCMD %2x\n"), get_cpu_pc(0), data);
#endif
break;
case 0x80:
if(device_type == 1) {
iramdisk_write_data(data);
}
break;
case 0x81:
if(device_type == 1) {
iramdisk_write_cmd(data);
}
break;
case 0x90:
// EXTAR
if(device_type == 2) {
extar = (extar & 0xffff00) | data;
}
break;
case 0x91:
// EXTAR
if(device_type == 2) {
extar = (extar & 0xff00ff) | (data << 8);
}
break;
case 0x92:
// EXTAR
if(device_type == 2) {
extar = (extar & 0x00ffff) | ((data & 7) << 16);
}
break;
case 0x93:
// EXTOR
if(device_type == 2) {
if(extar < 0x20000) {
ext[extar] = data;
}
extar = (extar & 0xffff00) | ((extar + 1) & 0xff);
}
break;
case 0x94:
// EXTCR
if(device_type == 2) {
extcr = data;
}
break;
}
}
uint32_t IO::read_io8(uint32_t addr)
{
uint32_t val = 0xff;
// this->out_debug_log(_T("IN %2x\n"), addr & 0xff);
switch(addr & 0xff) {
case 0x00:
// ICRL.C (latch FRC value)
icrc = get_passed_clock(cur_clock) / 4;
return icrc & 0xff;
case 0x01:
// ICRH.C
return (icrc >> 8) & 0xff;
case 0x02:
// ICRL.B
return icrb & 0xff;
case 0x03:
// ICRH.B
isr &= ~BIT_ICF;
update_intr();
return (icrb >> 8) & 0xff;
case 0x04:
// ISR
return isr;
case 0x05:
// STR
return 8 | 4 | (ear ? 1 : 0); // always rdysio=rdy=true
case 0x06:
// SIOR
return rec_from_7508();
case 0x0c:
// 8251 data read
isr &= ~BIT_8251;
update_intr();
return d_sio->read_io8(0);
case 0x0d:
// 8251 status read
return d_sio->read_io8(1);
case 0x0e:
// 6303 status
return psr;
case 0x0f:
// 6303 recv data
val = rsp6303_buf->read();
psr &= ~BIT_IBF;
if(!rsp6303_buf->empty()) {
psr &= ~BIT_F1;
}
#ifdef OUT_CMD_LOG
this->out_debug_log(_T("%4x\tRCV %2x\n"), get_cpu_pc(0), val);
#endif
return val;
case 0x80:
if(device_type == 1) {
return iramdisk_read_data();
}
return 0xff;
case 0x81:
if(device_type == 1) {
return iramdisk_read_stat();
}
return 0xff;
case 0x93:
// EXTIR
if(device_type == 2) {
if(extar < 0x40000) {
val = ext[extar];
}
extar = (extar & 0xffff00) | ((extar + 1) & 0xff);
return val;
}
return 0xff;
case 0x94:
// EXTSR
if(device_type == 2) {
return extcr & ~0x80;
}
return 0xff;
}
return 0xff;
}
uint32_t IO::get_intr_ack()
{
if(isr & BIT_7508) {
isr &= ~BIT_7508;
return 0xf0;
} else if(isr & BIT_8251) {
return 0xf2;
} else if(isr & BIT_CD) {
return 0xf4;
} else if(isr & BIT_ICF) {
return 0xf6;
} else if(isr & BIT_OVF) {
return 0xf8;
} else if(isr & BIT_EXT) {
return 0xfa;
}
// unknown
return 0xff;
}
void IO::update_intr()
{
// set int signal
bool next = ((isr & ier & 0x3f) != 0);
d_cpu->set_intr_line(next, true, 0);
}
// ----------------------------------------------------------------------------
// 7508
// ----------------------------------------------------------------------------
void IO::send_to_7508(uint8_t val)
{
int res;
// process command
cmd7508_buf->write(val);
uint8_t cmd = cmd7508_buf->read_not_remove(0);
switch(cmd) {
case 0x01:
// power off
cmd7508_buf->read();
break;
case 0x02:
// status / key
cmd7508_buf->read();
if((onesec_intr && onesec_intr_enb) || (alarm_intr && alarm_intr_enb) || res_z80 || res_7508) {
res = 0xc1;
res |= (onesec_intr && onesec_intr_enb) ? 0x20 : 0;
res |= (res_z80 ? 0x10 : 0) | (res_7508 ? 8 : 0);
res |= (alarm_intr && alarm_intr_enb) ? 2 : 0;
// clear interrupt
onesec_intr = alarm_intr = res_z80 = res_7508 = false;
} else if(key_buf->count()) {
res = key_buf->read();
} else {
res = 0xbf;
}
rsp7508_buf->write(res);
// request next interrupt
if(key_buf->count() && kb_intr_enb) {
isr |= BIT_7508;
update_intr();
}
break;
case 0x03:
// kb reset
cmd7508_buf->read();
key_buf->clear();
kb_rep_spd1 = 42 | 0x80;
kb_rep_spd2 = 18 | 0x80;
kb_intr_enb = true;
break;
case 0x04:
// kb repeat timer 1 set
if(cmd7508_buf->count() == 2) {
cmd7508_buf->read();
kb_rep_spd1 = cmd7508_buf->read();
}
break;
case 0x05:
// kb repeat off
cmd7508_buf->read();
kb_rep_enb = false;
break;
case 0x06:
// kb interrupt off
cmd7508_buf->read();
kb_intr_enb = false;
break;
case 0x07:
// clock read
cmd7508_buf->read();
rsp7508_buf->write(TO_BCD_HI(cur_time.year));
rsp7508_buf->write(TO_BCD_LO(cur_time.year));
rsp7508_buf->write(TO_BCD(cur_time.month));
rsp7508_buf->write(TO_BCD(cur_time.day));
rsp7508_buf->write(TO_BCD(cur_time.hour));
rsp7508_buf->write(TO_BCD(cur_time.minute));
rsp7508_buf->write(TO_BCD(cur_time.second));
rsp7508_buf->write(cur_time.day_of_week);
break;
case 0x08:
// power switch read
cmd7508_buf->read();
rsp7508_buf->write(1);
break;
case 0x09:
// alarm read
cmd7508_buf->read();
rsp7508_buf->write(alarm[0]);
rsp7508_buf->write(alarm[1]);
rsp7508_buf->write(alarm[2]);
rsp7508_buf->write(alarm[3]);
rsp7508_buf->write(alarm[4]);
rsp7508_buf->write(alarm[5]);
break;
case 0x0a:
// dip switch read
cmd7508_buf->read();
res = 0xf; // ascii keyboard
rsp7508_buf->write(res);
break;
case 0x0b:
// set power failure detect voltage
if(cmd7508_buf->count() == 2) {
cmd7508_buf->read();
cmd7508_buf->read();
}
break;
case 0x0c:
// read buttery voltage
cmd7508_buf->read();
rsp7508_buf->write(0xe0);
break;
case 0x0d:
// 1 sec interrupt off
cmd7508_buf->read();
onesec_intr_enb = false;
break;
case 0x0e:
// kb clear
cmd7508_buf->read();
key_buf->clear();
break;
case 0x0f:
// system reset
cmd7508_buf->read();
res_7508 = true;
break;
case 0x14:
// kb repeat timer 2 set
if(cmd7508_buf->count() == 2) {
cmd7508_buf->read();
kb_rep_spd2 = cmd7508_buf->read();
}
break;
case 0x15:
// kb repeat on
cmd7508_buf->read();
kb_rep_enb = true;
break;
case 0x16:
// kb interrupt on
cmd7508_buf->read();
kb_intr_enb = true;
break;
case 0x17:
// clock write
if(cmd7508_buf->count() == 9) {
cmd7508_buf->read();
int year10 = cmd7508_buf->read();
int year1 = cmd7508_buf->read();
int month = cmd7508_buf->read();
int day = cmd7508_buf->read();
int hour = cmd7508_buf->read();
int minute = cmd7508_buf->read();
int second = cmd7508_buf->read();
int day_of_week = cmd7508_buf->read();
if((month & 0x0f) == 0 || (day & 0x0f) == 0) {
// invalid date
get_host_time(&cur_time);
} else {
bool changed = false;
if((year10 & 0x0f) != 0x0f && (year1 & 0x0f) != 0x0f) {
cur_time.year = (year10 & 0x0f) * 10 + (year1 & 0x0f);
cur_time.update_year();
changed = true;
}
if((month & 0x0f) != 0x0f) {
cur_time.month = FROM_BCD(month & 0x1f);
changed = true;
}
if((day & 0x0f) != 0x0f) {
cur_time.day = FROM_BCD(day & 0x3f);
changed = true;
}
if((hour & 0x0f) != 0x0f) {
cur_time.hour = FROM_BCD(hour & 0x3f);
changed = true;
}
if((minute & 0x0f) != 0x0f) {
cur_time.minute = FROM_BCD(minute & 0x7f);
changed = true;
}
if((second & 0x0f) != 0x0f) {
cur_time.second = FROM_BCD(second & 0x7f);
changed = true;
}
// if((day_of_week & 0x0f) != 0x0f) {
// cur_time.day_of_week = day_of_week & 0x07;
// changed = true;
// }
if(changed) {
cur_time.update_day_of_week();
// restart event
cancel_event(this, register_id);
register_event_by_clock(this, EVENT_1SEC, CPU_CLOCKS, true, ®ister_id);
}
}
}
break;
case 0x19:
// alarm set
if(cmd7508_buf->count() == 7) {
cmd7508_buf->read();
alarm[0] = cmd7508_buf->read();
alarm[1] = cmd7508_buf->read();
alarm[2] = cmd7508_buf->read();
alarm[3] = cmd7508_buf->read();
alarm[4] = cmd7508_buf->read();
alarm[5] = cmd7508_buf->read();
}
break;
case 0x1b:
// set full charge voltage
if(cmd7508_buf->count() == 2) {
cmd7508_buf->read();
cmd7508_buf->read();
}
break;
case 0x1c:
// read temperature
cmd7508_buf->read();
rsp7508_buf->write(0x90);
break;
case 0x1d:
// 1 sec interrupt on
cmd7508_buf->read();
onesec_intr_enb = true;
break;
case 0x24:
// kb repeat timer 1 read
cmd7508_buf->read();
rsp7508_buf->write(kb_rep_spd1);
break;
case 0x29:
// alarm off
cmd7508_buf->read();
alarm_intr_enb = false;
break;
case 0x2c:
// read analog jack 1
cmd7508_buf->read();
rsp7508_buf->write(0);
break;
case 0x34:
// kb repeat timer 2 read
cmd7508_buf->read();
rsp7508_buf->write(kb_rep_spd2);
break;
case 0x39:
// alarm on
cmd7508_buf->read();
alarm_intr_enb = true;
break;
case 0x3c:
// read analog jack 2
cmd7508_buf->read();
rsp7508_buf->write(0);
break;
default:
// unknown cmd
cmd7508_buf->read();
this->out_debug_log(_T("unknown cmd %2x\n"), cmd);
}
}
uint8_t IO::rec_from_7508()
{
return rsp7508_buf->read();
}
void IO::key_down(int code)
{
if(code == 0x14) {
// toggle caps lock
kb_caps = !kb_caps;
update_key(kb_caps ? 0xb4 : 0xa4);
update_key(kb_caps ? 0xa4 : 0xb4);
} else {
update_key(key_tbl[code & 0xff]);
}
}
void IO::key_up(int code)
{
if(code == 0x10) {
update_key(0xa3); // break shift
} else if(code == 0x11) {
update_key(0xa2); // break ctrl
}
}
void IO::update_key(int code)
{
if(code != 0xff) {
// add to buffer
if(code == 0x10) {
// stop key
key_buf->clear();
key_buf->write(code);
} else {
key_buf->write(code);
}
// key interrupt
if(kb_intr_enb || (!kb_intr_enb && code == 0x10)) {
isr |= BIT_7508;
update_intr();
}
}
}
// ----------------------------------------------------------------------------
// 6303
// ----------------------------------------------------------------------------
void IO::process_6303()
{
switch(cmd6303) {
case 0x00:
// read data
if(cmd6303_buf->count() == 2) {
uint16_t addr = cmd6303_buf->read() << 8;
addr |= cmd6303_buf->read();
rsp6303_buf->write(RCD00);
rsp6303_buf->write(ram[addr]);
psr |= BIT_F1;
}
break;
case 0x01:
// write data
if(cmd6303_buf->count() == 4) {
uint16_t addr = cmd6303_buf->read() << 8;
addr |= cmd6303_buf->read();
uint8_t val = cmd6303_buf->read();
uint8_t ope = cmd6303_buf->read();
if(ope == 1) {
ram[addr] &= val;
} else if(ope == 2) {
ram[addr] |= val;
} else if(ope == 3) {
ram[addr] ^= val;
} else {
ram[addr] = val;
}
rsp6303_buf->write(RCD00);
psr |= BIT_F1;
}
break;
case 0x02:
// execute routine
if(cmd6303_buf->count() == 2) {
uint16_t addr = cmd6303_buf->read() << 8;
addr |= cmd6303_buf->read();
// unknown
rsp6303_buf->write(RCD00);
psr |= BIT_F1;
}
break;
case 0x0b:
// unknown (initialize???)
rsp6303_buf->write(RCD00);
psr |= BIT_F1;
break;
case 0x10:
// define screen mode
if(cmd6303_buf->count() == 16) {
cs_addr = cmd6303_buf->read() << 8;
cs_addr |= cmd6303_buf->read();
gs_addr = cmd6303_buf->read() << 8;
gs_addr |= cmd6303_buf->read();
cmd6303_buf->read();
cmd6303_buf->read();
cmd6303_buf->read();
cmd6303_buf->read();
cmd6303_buf->read();
cmd6303_buf->read();
cmd6303_buf->read();
cmd6303_buf->read();
uint16_t bottom = cmd6303_buf->read() << 8;
bottom |= cmd6303_buf->read();
cmd6303_buf->read();
cmd6303_buf->read();
rsp6303_buf->write(RCD00);
psr |= BIT_F1;
// go to character screen mode ???
scr_mode = 0xff;
// stop block flashing ???
flash_block = 0;
cs_blocks = gs_blocks = 0;
// clear screen ???
memset(&ram[cs_addr], 0, bottom - cs_addr);
}
break;
case 0x11:
// turn on/off lcd
if(cmd6303_buf->count() == 1) {
lcd_on = cmd6303_buf->read();
rsp6303_buf->write(RCD00);
psr |= BIT_F1;
}
break;
case 0x12:
// select screen
if(cmd6303_buf->count() == 1) {
scr_mode = cmd6303_buf->read();
if(!scr_mode) {
scr_ptr = cs_addr;
}
rsp6303_buf->write(RCD00);
psr |= BIT_F1;
}
break;
case 0x13:
// read screen pointer
rsp6303_buf->write(RCD00);
rsp6303_buf->write(scr_ptr >> 8);
rsp6303_buf->write(scr_ptr & 0xff);
psr |= BIT_F1;
break;
case 0x14:
// set screen pointer
if(cmd6303_buf->count() == 2) {
scr_ptr = cmd6303_buf->read() << 8;
scr_ptr |= cmd6303_buf->read();
rsp6303_buf->write(RCD00);
psr |= BIT_F1;
// stop block flashing ???
flash_block = 0;
cs_blocks = gs_blocks = 0;
}
break;
case 0x15:
// define number of lines
if(cmd6303_buf->count() == 1) {
num_lines = cmd6303_buf->read();
rsp6303_buf->write(RCD00);
psr |= BIT_F1;
}
break;
case 0x16:
// define cursor mode
if(cmd6303_buf->count() == 1) {
curs_mode = cmd6303_buf->read();
rsp6303_buf->write(RCD00);
psr |= BIT_F1;
}
break;
case 0x17:
// read cursur position
rsp6303_buf->write(RCD00);
rsp6303_buf->write(curs_x);
rsp6303_buf->write(curs_y);
psr |= BIT_F1;
break;
case 0x18:
// set cursor position
if(cmd6303_buf->count() == 2) {
curs_x = cmd6303_buf->read();
curs_y = cmd6303_buf->read();
rsp6303_buf->write(RCD00);
psr |= BIT_F1;
}
break;
case 0x19:
// start/stop control block flashing
if(cmd6303_buf->count() == 1) {
flash_block = cmd6303_buf->read();
rsp6303_buf->write(RCD00);
psr |= BIT_F1;
}
break;
case 0x1a:
// clear screen
if(cmd6303_buf->count() == 4) {
uint8_t scr = cmd6303_buf->read();
uint8_t code = cmd6303_buf->read();
int sy = cmd6303_buf->read();
int num = cmd6303_buf->read();
if(scr) {
// char screen
for(int y = 0; y < num; y++) {
if(sy + y < 64) {
memset(&ram[cs_addr + (sy + y) * 80], code, 80);
}
}
} else {
// graph screen
for(int y = 0; y < num; y++) {
if(sy + y < 8) {
memset(&ram[gs_addr + (sy + y) * 60 * 8], code, 60 * 8);
}
}
}
rsp6303_buf->write(RCD00);