/*
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
*
* This file is part of the 86Box distribution.
*
* Emulation of the Olivetti XT-compatible machines.
*
*
*
* Authors: Sarah Walker,
* Miran Grca,
* Fred N. van Kempen,
* EngiNerd
*
* Copyright 2008-2019 Sarah Walker.
* Copyright 2016-2019 Miran Grca.
* Copyright 2017-2019 Fred N. van Kempen.
* Copyright 2020 EngiNerd.
*/
#include
#include
#include
#include
#include
#include
#include <86box/86box.h>
#include <86box/timer.h>
#include <86box/io.h>
#include <86box/pic.h>
#include <86box/pit.h>
#include <86box/ppi.h>
#include <86box/nmi.h>
#include <86box/mem.h>
#include <86box/device.h>
#include <86box/nvr.h>
#include <86box/keyboard.h>
#include <86box/mouse.h>
#include <86box/rom.h>
#include <86box/fdd.h>
#include <86box/fdc.h>
#include <86box/fdc_ext.h>
#include <86box/gameport.h>
#include <86box/port_6x.h>
#include <86box/sound.h>
#include <86box/snd_speaker.h>
#include <86box/video.h>
#include <86box/machine.h>
#include <86box/vid_cga.h>
#include <86box/vid_ogc.h>
#include <86box/vid_colorplus.h>
#include <86box/vid_cga_comp.h>
#define STAT_PARITY 0x80
#define STAT_RTIMEOUT 0x40
#define STAT_TTIMEOUT 0x20
#define STAT_LOCK 0x10
#define STAT_CD 0x08
#define STAT_SYSFLAG 0x04
#define STAT_IFULL 0x02
#define STAT_OFULL 0x01
#define PLANTRONICS_MODE 1
#define OLIVETTI_OGC_MODE 0
#define CGA_RGB 0
#define CGA_COMPOSITE 1
typedef struct {
/* Keyboard stuff. */
int wantirq;
uint8_t command;
uint8_t status;
uint8_t out;
uint8_t output_port;
int param,
param_total;
uint8_t params[16];
uint8_t scan[7];
/* Mouse stuff. */
int mouse_mode;
int x, y, b;
pc_timer_t send_delay_timer;
} m24_kbd_t;
typedef struct {
ogc_t ogc;
colorplus_t colorplus;
int mode;
} m19_vid_t;
static uint8_t key_queue[16];
static int key_queue_start = 0,
key_queue_end = 0;
video_timings_t timing_m19_vid = {VIDEO_ISA, 8, 16, 32, 8, 16, 32};
const device_t m19_vid_device;
#ifdef ENABLE_M24VID_LOG
int m24vid_do_log = ENABLE_M24VID_LOG;
static void
m24_log(const char *fmt, ...)
{
va_list ap;
if (m24vid_do_log) {
va_start(ap, fmt);
vfprintf(stdlog, fmt, ap);
va_end(ap);
fflush(stdlog);
}
}
#else
#define m24_log(fmt, ...)
#endif
static void
m24_kbd_poll(void *priv)
{
m24_kbd_t *m24_kbd = (m24_kbd_t *)priv;
timer_advance_u64(&m24_kbd->send_delay_timer, 1000 * TIMER_USEC);
if (m24_kbd->wantirq) {
m24_kbd->wantirq = 0;
picint(2);
#if ENABLE_KEYBOARD_LOG
m24_log("M24: take IRQ\n");
#endif
}
if (!(m24_kbd->status & STAT_OFULL) && key_queue_start != key_queue_end) {
#if ENABLE_KEYBOARD_LOG
m24_log("Reading %02X from the key queue at %i\n",
m24_kbd->out, key_queue_start);
#endif
m24_kbd->out = key_queue[key_queue_start];
key_queue_start = (key_queue_start + 1) & 0xf;
m24_kbd->status |= STAT_OFULL;
m24_kbd->status &= ~STAT_IFULL;
m24_kbd->wantirq = 1;
}
}
static void
m24_kbd_adddata(uint16_t val)
{
key_queue[key_queue_end] = val;
key_queue_end = (key_queue_end + 1) & 0xf;
}
static void
m24_kbd_adddata_ex(uint16_t val)
{
kbd_adddata_process(val, m24_kbd_adddata);
}
static void
m24_kbd_write(uint16_t port, uint8_t val, void *priv)
{
m24_kbd_t *m24_kbd = (m24_kbd_t *)priv;
#if ENABLE_KEYBOARD_LOG
m24_log("M24: write %04X %02X\n", port, val);
#endif
#if 0
if (ram[8] == 0xc3)
output = 3;
#endif
switch (port) {
case 0x60:
if (m24_kbd->param != m24_kbd->param_total) {
m24_kbd->params[m24_kbd->param++] = val;
if (m24_kbd->param == m24_kbd->param_total) {
switch (m24_kbd->command) {
case 0x11:
m24_kbd->mouse_mode = 0;
m24_kbd->scan[0] = m24_kbd->params[0];
m24_kbd->scan[1] = m24_kbd->params[1];
m24_kbd->scan[2] = m24_kbd->params[2];
m24_kbd->scan[3] = m24_kbd->params[3];
m24_kbd->scan[4] = m24_kbd->params[4];
m24_kbd->scan[5] = m24_kbd->params[5];
m24_kbd->scan[6] = m24_kbd->params[6];
break;
case 0x12:
m24_kbd->mouse_mode = 1;
m24_kbd->scan[0] = m24_kbd->params[0];
m24_kbd->scan[1] = m24_kbd->params[1];
m24_kbd->scan[2] = m24_kbd->params[2];
break;
default:
m24_log("M24: bad keyboard command complete %02X\n", m24_kbd->command);
}
}
} else {
m24_kbd->command = val;
switch (val) {
case 0x01: /*Self-test*/
break;
case 0x05: /*Read ID*/
m24_kbd_adddata(0x00);
break;
case 0x11:
m24_kbd->param = 0;
m24_kbd->param_total = 9;
break;
case 0x12:
m24_kbd->param = 0;
m24_kbd->param_total = 4;
break;
default:
m24_log("M24: bad keyboard command %02X\n", val);
}
}
break;
case 0x61:
ppi.pb = val;
speaker_update();
speaker_gated = val & 1;
speaker_enable = val & 2;
if (speaker_enable)
was_speaker_enable = 1;
pit_ctr_set_gate(&pit->counters[2], val & 1);
break;
}
}
static uint8_t
m24_kbd_read(uint16_t port, void *priv)
{
m24_kbd_t *m24_kbd = (m24_kbd_t *)priv;
uint8_t ret = 0xff;
switch (port) {
case 0x60:
ret = m24_kbd->out;
if (key_queue_start == key_queue_end) {
m24_kbd->status &= ~STAT_OFULL;
m24_kbd->wantirq = 0;
} else {
m24_kbd->out = key_queue[key_queue_start];
key_queue_start = (key_queue_start + 1) & 0xf;
m24_kbd->status |= STAT_OFULL;
m24_kbd->status &= ~STAT_IFULL;
m24_kbd->wantirq = 1;
}
break;
case 0x61:
ret = ppi.pb;
break;
case 0x64:
ret = m24_kbd->status;
m24_kbd->status &= ~(STAT_RTIMEOUT | STAT_TTIMEOUT);
break;
default:
m24_log("\nBad M24 keyboard read %04X\n", port);
}
return(ret);
}
static void
m24_kbd_close(void *priv)
{
m24_kbd_t *kbd = (m24_kbd_t *)priv;
/* Stop the timer. */
timer_disable(&kbd->send_delay_timer);
/* Disable scanning. */
keyboard_scan = 0;
keyboard_send = NULL;
io_removehandler(0x0060, 2,
m24_kbd_read, NULL, NULL, m24_kbd_write, NULL, NULL, kbd);
io_removehandler(0x0064, 1,
m24_kbd_read, NULL, NULL, m24_kbd_write, NULL, NULL, kbd);
free(kbd);
}
static void
m24_kbd_reset(void *priv)
{
m24_kbd_t *m24_kbd = (m24_kbd_t *)priv;
/* Initialize the keyboard. */
m24_kbd->status = STAT_LOCK | STAT_CD;
m24_kbd->wantirq = 0;
keyboard_scan = 1;
m24_kbd->param = m24_kbd->param_total = 0;
m24_kbd->mouse_mode = 0;
m24_kbd->scan[0] = 0x1c;
m24_kbd->scan[1] = 0x53;
m24_kbd->scan[2] = 0x01;
m24_kbd->scan[3] = 0x4b;
m24_kbd->scan[4] = 0x4d;
m24_kbd->scan[5] = 0x48;
m24_kbd->scan[6] = 0x50;
}
static int
ms_poll(int x, int y, int z, int b, void *priv)
{
m24_kbd_t *m24_kbd = (m24_kbd_t *)priv;
m24_kbd->x += x;
m24_kbd->y += y;
if (((key_queue_end - key_queue_start) & 0xf) > 14) return(0xff);
if ((b & 1) && !(m24_kbd->b & 1))
m24_kbd_adddata(m24_kbd->scan[0]);
if (!(b & 1) && (m24_kbd->b & 1))
m24_kbd_adddata(m24_kbd->scan[0] | 0x80);
m24_kbd->b = (m24_kbd->b & ~1) | (b & 1);
if (((key_queue_end - key_queue_start) & 0xf) > 14) return(0xff);
if ((b & 2) && !(m24_kbd->b & 2))
m24_kbd_adddata(m24_kbd->scan[2]);
if (!(b & 2) && (m24_kbd->b & 2))
m24_kbd_adddata(m24_kbd->scan[2] | 0x80);
m24_kbd->b = (m24_kbd->b & ~2) | (b & 2);
if (((key_queue_end - key_queue_start) & 0xf) > 14) return(0xff);
if ((b & 4) && !(m24_kbd->b & 4))
m24_kbd_adddata(m24_kbd->scan[1]);
if (!(b & 4) && (m24_kbd->b & 4))
m24_kbd_adddata(m24_kbd->scan[1] | 0x80);
m24_kbd->b = (m24_kbd->b & ~4) | (b & 4);
if (m24_kbd->mouse_mode) {
if (((key_queue_end - key_queue_start) & 0xf) > 12) return(0xff);
if (!m24_kbd->x && !m24_kbd->y) return(0xff);
m24_kbd->y = -m24_kbd->y;
if (m24_kbd->x < -127) m24_kbd->x = -127;
if (m24_kbd->x > 127) m24_kbd->x = 127;
if (m24_kbd->x < -127) m24_kbd->x = 0x80 | ((-m24_kbd->x) & 0x7f);
if (m24_kbd->y < -127) m24_kbd->y = -127;
if (m24_kbd->y > 127) m24_kbd->y = 127;
if (m24_kbd->y < -127) m24_kbd->y = 0x80 | ((-m24_kbd->y) & 0x7f);
m24_kbd_adddata(0xfe);
m24_kbd_adddata(m24_kbd->x);
m24_kbd_adddata(m24_kbd->y);
m24_kbd->x = m24_kbd->y = 0;
} else {
while (m24_kbd->x < -4) {
if (((key_queue_end - key_queue_start) & 0xf) > 14)
return(0xff);
m24_kbd->x += 4;
m24_kbd_adddata(m24_kbd->scan[3]);
}
while (m24_kbd->x > 4) {
if (((key_queue_end - key_queue_start) & 0xf) > 14)
return(0xff);
m24_kbd->x -= 4;
m24_kbd_adddata(m24_kbd->scan[4]);
}
while (m24_kbd->y < -4) {
if (((key_queue_end - key_queue_start) & 0xf) > 14)
return(0xff);
m24_kbd->y += 4;
m24_kbd_adddata(m24_kbd->scan[5]);
}
while (m24_kbd->y > 4) {
if (((key_queue_end - key_queue_start) & 0xf) > 14)
return(0xff);
m24_kbd->y -= 4;
m24_kbd_adddata(m24_kbd->scan[6]);
}
}
return(0);
}
static void
m24_kbd_init(m24_kbd_t *kbd)
{
/* Initialize the keyboard. */
io_sethandler(0x0060, 2,
m24_kbd_read, NULL, NULL, m24_kbd_write, NULL, NULL, kbd);
io_sethandler(0x0064, 1,
m24_kbd_read, NULL, NULL, m24_kbd_write, NULL, NULL, kbd);
keyboard_send = m24_kbd_adddata_ex;
m24_kbd_reset(kbd);
timer_add(&kbd->send_delay_timer, m24_kbd_poll, kbd, 1);
/* Tell mouse driver about our internal mouse. */
mouse_reset();
mouse_set_poll(ms_poll, kbd);
keyboard_set_table(scancode_xt);
keyboard_set_is_amstrad(0);
}
static void
m19_vid_out(uint16_t addr, uint8_t val, void *priv)
{
m19_vid_t *vid = (m19_vid_t *)priv;
int oldmode = vid->mode;
/* activating plantronics mode */
if (addr == 0x3dd) {
/* already in graphics mode */
if ((val & 0x30) && (vid->ogc.cga.cgamode & 0x2))
vid->mode = PLANTRONICS_MODE;
else
vid->mode = OLIVETTI_OGC_MODE;
/* setting graphics mode */
} else if (addr == 0x3d8) {
if ((val & 0x2) && (vid->colorplus.control & 0x30))
vid->mode = PLANTRONICS_MODE;
else
vid->mode = OLIVETTI_OGC_MODE;
}
/* video mode changed */
if (oldmode != vid->mode) {
/* activate Plantronics emulation */
if (vid->mode == PLANTRONICS_MODE){
timer_disable(&vid->ogc.cga.timer);
timer_set_delay_u64(&vid->colorplus.cga.timer, 0);
/* return to OGC mode */
} else {
timer_disable(&vid->colorplus.cga.timer);
timer_set_delay_u64(&vid->ogc.cga.timer, 0);
}
colorplus_recalctimings(&vid->colorplus);
ogc_recalctimings(&vid->ogc);
}
colorplus_out(addr, val, &vid->colorplus);
ogc_out(addr, val, &vid->ogc);
}
static uint8_t
m19_vid_in(uint16_t addr, void *priv)
{
m19_vid_t *vid = (m19_vid_t *)priv;
if (vid->mode == PLANTRONICS_MODE)
return colorplus_in(addr, &vid->colorplus);
else
return ogc_in(addr, &vid->ogc);
}
static uint8_t
m19_vid_read(uint32_t addr, void *priv)
{
m19_vid_t *vid = (m19_vid_t *)priv;
vid->colorplus.cga.mapping = vid->ogc.cga.mapping;
if (vid->mode == PLANTRONICS_MODE)
return colorplus_read(addr, &vid->colorplus);
else
return ogc_read(addr, &vid->ogc);
}
static void
m19_vid_write(uint32_t addr, uint8_t val, void *priv)
{
m19_vid_t *vid = (m19_vid_t *)priv;
colorplus_write(addr, val, &vid->colorplus);
ogc_write(addr, val, &vid->ogc);
}
static void
m19_vid_close(void *priv)
{
m19_vid_t *vid = (m19_vid_t *)priv;
free(vid->ogc.cga.vram);
free(vid->colorplus.cga.vram);
free(vid);
}
static void
m19_vid_speed_changed(void *priv)
{
m19_vid_t *vid = (m19_vid_t *)priv;
colorplus_recalctimings(&vid->colorplus);
ogc_recalctimings(&vid->ogc);
}
static void
m19_vid_init(m19_vid_t *vid)
{
device_context(&m19_vid_device);
/* int display_type; */
vid->mode = OLIVETTI_OGC_MODE;
video_inform(VIDEO_FLAG_TYPE_CGA, &timing_m19_vid);
/* display_type = device_get_config_int("display_type"); */
/* OGC emulation part begin */
loadfont_ex("roms/machines/m19/BIOS.BIN", 1, 90);
/* composite is not working yet */
vid->ogc.cga.composite = 0; // (display_type != CGA_RGB);
vid->ogc.cga.revision = device_get_config_int("composite_type");
vid->ogc.cga.snow_enabled = device_get_config_int("snow_enabled");
vid->ogc.cga.vram = malloc(0x8000);
/* cga_comp_init(vid->ogc.cga.revision); */
vid->ogc.cga.rgb_type = device_get_config_int("rgb_type");
cga_palette = (vid->ogc.cga.rgb_type << 1);
cgapal_rebuild();
ogc_mdaattr_rebuild();
/* color display */
if (device_get_config_int("rgb_type")==0 || device_get_config_int("rgb_type") == 4)
vid->ogc.mono_display = 0;
else
vid->ogc.mono_display = 1;
/* OGC emulation part end */
/* Plantronics emulation part begin*/
/* composite is not working yet */
vid->colorplus.cga.composite = 0; //(display_type != CGA_RGB);
/* vid->colorplus.cga.snow_enabled = device_get_config_int("snow_enabled"); */
vid->colorplus.cga.vram = malloc(0x8000);
/* vid->colorplus.cga.cgamode = 0x1; */
/* Plantronics emulation part end*/
timer_add(&vid->ogc.cga.timer, ogc_poll, &vid->ogc, 1);
timer_add(&vid->colorplus.cga.timer, colorplus_poll, &vid->colorplus, 1);
timer_disable(&vid->colorplus.cga.timer);
mem_mapping_add(&vid->ogc.cga.mapping, 0xb8000, 0x08000, m19_vid_read, NULL, NULL, m19_vid_write, NULL, NULL, NULL, MEM_MAPPING_EXTERNAL, vid);
io_sethandler(0x03d0, 0x0010, m19_vid_in, NULL, NULL, m19_vid_out, NULL, NULL, vid);
vid->mode = OLIVETTI_OGC_MODE;
device_context_restore();
}
const device_t m24_kbd_device = {
.name = "Olivetti M24 keyboard and mouse",
.internal_name = "m24_kbd",
.flags = 0,
.local = 0,
.init = NULL,
.close = m24_kbd_close,
.reset = m24_kbd_reset,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
const device_config_t m19_vid_config[] = {
{
/* Olivetti / ATT compatible displays */
.name = "rgb_type",
.description = "RGB type",
.type = CONFIG_SELECTION,
.default_string = "",
.default_int = CGA_RGB,
.file_filter = "",
.spinner = { 0 },
.selection = {
{ .description = "Color", .value = 0 },
{ .description = "Green Monochrome", .value = 1 },
{ .description = "Amber Monochrome", .value = 2 },
{ .description = "Gray Monochrome", .value = 3 },
{ .description = "" }
}
},
{
.name = "snow_enabled",
.description = "Snow emulation",
.type = CONFIG_BINARY,
.default_string = "",
.default_int = 1,
},
{ .name = "", .description = "", .type = CONFIG_END }
};
const device_t m19_vid_device = {
.name = "Olivetti M19 graphics card",
.internal_name = "m19_vid",
.flags = 0,
.local = 0,
.init = NULL,
.close = m19_vid_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = m19_vid_speed_changed,
.force_redraw = NULL,
.config = m19_vid_config
};
const device_t *
m19_get_device(void)
{
return &m19_vid_device;
}
static uint8_t
m24_read(uint16_t port, void *priv)
{
uint8_t ret = 0x00;
int i, fdd_count = 0;
switch (port) {
/*
* port 66:
* DIPSW-0 on mainboard (off=present=1)
* bit 7 - 2764 (off) / 2732 (on) ROM (BIOS < 1.36)
* bit 7 - Use (off) / do not use (on) memory bank 1 (BIOS >= 1.36)
* bit 6 - n/a
* bit 5 - 8530 (off) / 8250 (on) SCC
* bit 4 - 8087 present
* bits 3-0 - installed memory
*/
case 0x66:
/* Switch 5 - 8087 present */
if (hasfpu)
ret |= 0x10;
/*
* Switches 1, 2, 3, 4 - installed memory
* Switch 8 - Use memory bank 1
*/
switch (mem_size) {
case 128:
ret |= 0x1;
break;
case 256:
ret |= 0x2|0x80;
break;
case 384:
ret |= 0x1|0x2|0x80;
break;
case 512:
ret |= 0x8;
break;
case 640:
default:
ret |= 0x1|0x8|0x80;
break;
}
/*
* port 67:
* DIPSW-1 on mainboard (off=present=1)
* bits 7-6 - number of drives
* bits 5-4 - display adapter
* bit 3 - video scroll CPU (on) / slow scroll (off)
* bit 2 - BIOS HD on mainboard (on) / on controller (off)
* bit 1 - FDD fast (off) / slow (on) start drive
* bit 0 - 96 TPI (720 KB 3.5") (off) / 48 TPI (360 KB 5.25") FDD drive
*
* Display adapter:
* off off 80x25 mono
* off on 40x25 color
* on off 80x25 color
* on on EGA/VGA (works only for BIOS ROM 1.43)
*/
case 0x67:
for (i = 0; i < FDD_NUM; i++) {
if (fdd_get_flags(i))
fdd_count++;
}
/* Switches 7, 8 - floppy drives. */
if (!fdd_count)
ret |= 0x00;
else
ret |= ((fdd_count - 1) << 6);
/* Switches 5, 6 - monitor type */
if (video_is_mda())
ret |= 0x30;
else if (video_is_cga())
ret |= 0x20; /* 0x10 would be 40x25 */
else
ret |= 0x0;
/* Switch 3 - Disable internal BIOS HD */
ret |= 0x4;
/* Switch 2 - Set fast startup */
ret |= 0x2;
}
return(ret);
}
const device_t *
m24_get_device(void)
{
return &ogc_m24_device;
}
int
machine_xt_m24_init(const machine_t *model)
{
int ret;
m24_kbd_t *m24_kbd;
ret = bios_load_interleaved("roms/machines/m24/olivetti_m24_version_1.43_low.bin",
"roms/machines/m24/olivetti_m24_version_1.43_high.bin",
0x000fc000, 16384, 0);
if (bios_only || !ret)
return ret;
m24_kbd = (m24_kbd_t *) malloc(sizeof(m24_kbd_t));
memset(m24_kbd, 0x00, sizeof(m24_kbd_t));
machine_common_init(model);
/* On-board FDC can be disabled only on M24SP */
if (fdc_type == FDC_INTERNAL)
device_add(&fdc_xt_device);
/* Address 66-67 = mainboard dip-switch settings */
io_sethandler(0x0066, 2, m24_read, NULL, NULL, NULL, NULL, NULL, NULL);
/* FIXME: make sure this is correct?? */
device_add(&at_nvr_device);
standalone_gameport_type = &gameport_device;
nmi_init();
video_reset(gfxcard);
if (gfxcard == VID_INTERNAL)
device_add(&ogc_m24_device);
m24_kbd_init(m24_kbd);
device_add_ex(&m24_kbd_device, m24_kbd);
return ret;
}
/*
* Current bugs:
* - handles only 360kb floppy drives (drive type and capacity selectable with jumpers mapped to unknown memory locations)
*/
int
machine_xt_m240_init(const machine_t *model)
{
int ret;
ret = bios_load_interleaved("roms/machines/m240/olivetti_m240_pch6_2.04_low.bin",
"roms/machines/m240/olivetti_m240_pch5_2.04_high.bin",
0x000f8000, 32768, 0);
if (bios_only || !ret)
return ret;
machine_common_init(model);
pit_ctr_set_out_func(&pit->counters[1], pit_refresh_timer_xt);
/* Address 66-67 = mainboard dip-switch settings */
io_sethandler(0x0066, 2, m24_read, NULL, NULL, NULL, NULL, NULL, NULL);
/*
* port 60: should return jumper settings only under unknown conditions
* SWB on mainboard (off=1)
* bit 7 - use BIOS HD on mainboard (on) / on controller (off)
* bit 6 - use OCG/CGA display adapter (on) / other display adapter (off)
*/
device_add(&keyboard_at_olivetti_device);
device_add(&port_6x_olivetti_device);
/* FIXME: make sure this is correct?? */
device_add(&at_nvr_device);
if (fdc_type == FDC_INTERNAL)
device_add(&fdc_xt_device);
if (joystick_type)
device_add(&gameport_device);
nmi_init();
return ret;
}
/*
* Current bugs:
* - 640x400x2 graphics mode not supported (bit 0 of register 0x3de cannot be set)
* - optional mouse emulation missing
* - setting CPU speed at 4.77MHz sometimes throws a timer error. If the machine is hard-resetted, the error disappears.
*/
int
machine_xt_m19_init(const machine_t *model)
{
int ret;
ret = bios_load_linear("roms/machines/m19/BIOS.BIN",
0x000fc000, 16384, 0);
if (bios_only || !ret)
return ret;
m19_vid_t *vid;
/* Do not move memory allocation elsewhere. */
vid = (m19_vid_t *) malloc(sizeof(m19_vid_t));
memset(vid, 0x00, sizeof(m19_vid_t));
machine_common_init(model);
pit_ctr_set_out_func(&pit->counters[1], pit_refresh_timer_xt);
/* On-board FDC cannot be disabled */
device_add(&fdc_xt_device);
nmi_init();
video_reset(gfxcard);
m19_vid_init(vid);
device_add_ex(&m19_vid_device, vid);
device_add(&keyboard_xt_olivetti_device);
pit_set_clock(14318184.0);
return ret;
}