/*
733 ASR emulation
We are emulating a TI Model 733 ASR ("Silent 700") data terminal,
interfaced through a TI asynchronous EIA/TTY interface module.
The ASR features a printer, a keyboard and a tape unit (which is not
emulated). The ASR is attached to the computer with a serial interface.
References:
945401-9701 Model 990/4 Computer System Field Maintainance Manual p. C-1,
945250-9701 990 Computer Family Systems Handbook pp. 5-9 through 5-16,
0943442-9701 Model 990 Computer Reference Manual Preliminary pp. 3-13
through 3-21 and 3-39 through 3-44.
TODO:
* separate ASR emulation from EIA interface emulation?
* implement tape interface?
Raphael Nabet 2003
*/
#include "emu.h"
#include "733_asr.h"
#include "devlegcy.h"
enum
{
/*ASROutQueueSize = 32,*/
asr_window_offset_x = 0,
asr_window_offset_y = 0,
asr_window_width = 640,
asr_window_height = 480,
asr_scroll_step = 8
};
struct asr_t
{
#if 0
UINT8 OutQueue[ASROutQueueSize];
int OutQueueHead;
int OutQueueLen;
#endif
UINT8 recv_buf;
UINT8 xmit_buf;
UINT8 status;
UINT8 mode;
UINT8 last_key_pressed;
int last_modifier_state;
unsigned char repeat_timer;
int new_status_flag;
int x;
void (*int_callback)(running_machine &, int state);
bitmap_ind16 *bitmap;
};
enum
{
AS_wrq_mask = 1 << 3,
AS_rrq_mask = 1 << 4,
AS_dsr_mask = 1 << 6,
AS_int_mask = 1 << 7,
AM_dtr_mask = 1 << 1,
AM_rts_mask = 1 << 2,
AM_enint_mask = 1 << 6
};
enum
{
asrfontdata_size = 96/*128*/*8
};
static const gfx_layout fontlayout =
{
6, 8, /* 6*8 characters */
/*96*/128, /* 96 characters */
1, /* 1 bit per pixel */
{ 0 },
{ 0, 1, 2, 3, 4, 5, 6, 7 }, /* straightforward layout */
{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 },
8*8 /* every char takes 8 consecutive bytes */
};
GFXDECODE_START( asr733 )
GFXDECODE_ENTRY( asr733_chr_region, 0, fontlayout, 0, 1 )
GFXDECODE_END
PALETTE_INIT_MEMBER(asr733_device, asr733)
{
palette_set_color(machine(),0,RGB_WHITE); /* white */
palette_set_color(machine(),1,RGB_BLACK); /* black */
}
/*
Initialize the asr core
*/
void asr733_init(running_machine &machine)
{
UINT8 *dst;
static const unsigned char fontdata6x8[asrfontdata_size] =
{ /* ASCII characters */
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x20,0x20,0x20,0x00,0x20,0x00,
0x50,0x50,0x50,0x00,0x00,0x00,0x00,0x00,0x00,0x50,0xf8,0x50,0xf8,0x50,0x00,0x00,
0x20,0x70,0xc0,0x70,0x18,0xf0,0x20,0x00,0x40,0xa4,0x48,0x10,0x20,0x48,0x94,0x08,
0x60,0x90,0xa0,0x40,0xa8,0x90,0x68,0x00,0x10,0x20,0x40,0x00,0x00,0x00,0x00,0x00,
0x20,0x40,0x40,0x40,0x40,0x40,0x20,0x00,0x10,0x08,0x08,0x08,0x08,0x08,0x10,0x00,
0x20,0xa8,0x70,0xf8,0x70,0xa8,0x20,0x00,0x00,0x20,0x20,0xf8,0x20,0x20,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x60,0x00,0x00,0x00,0xf8,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x08,0x10,0x20,0x40,0x80,0x00,0x00,
0x70,0x88,0x88,0x88,0x88,0x88,0x70,0x00,0x10,0x30,0x10,0x10,0x10,0x10,0x10,0x00,
0x70,0x88,0x08,0x10,0x20,0x40,0xf8,0x00,0x70,0x88,0x08,0x30,0x08,0x88,0x70,0x00,
0x10,0x30,0x50,0x90,0xf8,0x10,0x10,0x00,0xf8,0x80,0xf0,0x08,0x08,0x88,0x70,0x00,
0x70,0x80,0xf0,0x88,0x88,0x88,0x70,0x00,0xf8,0x08,0x08,0x10,0x20,0x20,0x20,0x00,
0x70,0x88,0x88,0x70,0x88,0x88,0x70,0x00,0x70,0x88,0x88,0x88,0x78,0x08,0x70,0x00,
0x00,0x00,0x30,0x30,0x00,0x30,0x30,0x00,0x00,0x00,0x30,0x30,0x00,0x30,0x30,0x60,
0x10,0x20,0x40,0x80,0x40,0x20,0x10,0x00,0x00,0x00,0xf8,0x00,0xf8,0x00,0x00,0x00,
0x40,0x20,0x10,0x08,0x10,0x20,0x40,0x00,0x70,0x88,0x08,0x10,0x20,0x00,0x20,0x00,
0x70,0x88,0xb8,0xa8,0xb8,0x80,0x70,0x00,0x70,0x88,0x88,0xf8,0x88,0x88,0x88,0x00,
0xf0,0x88,0x88,0xf0,0x88,0x88,0xf0,0x00,0x70,0x88,0x80,0x80,0x80,0x88,0x70,0x00,
0xf0,0x88,0x88,0x88,0x88,0x88,0xf0,0x00,0xf8,0x80,0x80,0xf0,0x80,0x80,0xf8,0x00,
0xf8,0x80,0x80,0xf0,0x80,0x80,0x80,0x00,0x70,0x88,0x80,0x98,0x88,0x88,0x70,0x00,
0x88,0x88,0x88,0xf8,0x88,0x88,0x88,0x00,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x00,
0x08,0x08,0x08,0x08,0x88,0x88,0x70,0x00,0x88,0x90,0xa0,0xc0,0xa0,0x90,0x88,0x00,
0x80,0x80,0x80,0x80,0x80,0x80,0xf8,0x00,0x88,0xd8,0xa8,0x88,0x88,0x88,0x88,0x00,
0x88,0xc8,0xa8,0x98,0x88,0x88,0x88,0x00,0x70,0x88,0x88,0x88,0x88,0x88,0x70,0x00,
0xf0,0x88,0x88,0xf0,0x80,0x80,0x80,0x00,0x70,0x88,0x88,0x88,0x88,0x88,0x70,0x08,
0xf0,0x88,0x88,0xf0,0x88,0x88,0x88,0x00,0x70,0x88,0x80,0x70,0x08,0x88,0x70,0x00,
0xf8,0x20,0x20,0x20,0x20,0x20,0x20,0x00,0x88,0x88,0x88,0x88,0x88,0x88,0x70,0x00,
0x88,0x88,0x88,0x88,0x88,0x50,0x20,0x00,0x88,0x88,0x88,0x88,0xa8,0xd8,0x88,0x00,
0x88,0x50,0x20,0x20,0x20,0x50,0x88,0x00,0x88,0x88,0x88,0x50,0x20,0x20,0x20,0x00,
0xf8,0x08,0x10,0x20,0x40,0x80,0xf8,0x00,0x30,0x20,0x20,0x20,0x20,0x20,0x30,0x00,
0x40,0x40,0x20,0x20,0x10,0x10,0x08,0x08,0x30,0x10,0x10,0x10,0x10,0x10,0x30,0x00,
0x20,0x50,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xfc,
0x40,0x20,0x10,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x70,0x08,0x78,0x88,0x78,0x00,
0x80,0x80,0xf0,0x88,0x88,0x88,0xf0,0x00,0x00,0x00,0x70,0x88,0x80,0x80,0x78,0x00,
0x08,0x08,0x78,0x88,0x88,0x88,0x78,0x00,0x00,0x00,0x70,0x88,0xf8,0x80,0x78,0x00,
0x18,0x20,0x70,0x20,0x20,0x20,0x20,0x00,0x00,0x00,0x78,0x88,0x88,0x78,0x08,0x70,
0x80,0x80,0xf0,0x88,0x88,0x88,0x88,0x00,0x20,0x00,0x20,0x20,0x20,0x20,0x20,0x00,
0x20,0x00,0x20,0x20,0x20,0x20,0x20,0xc0,0x80,0x80,0x90,0xa0,0xe0,0x90,0x88,0x00,
0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x00,0x00,0x00,0xf0,0xa8,0xa8,0xa8,0xa8,0x00,
0x00,0x00,0xb0,0xc8,0x88,0x88,0x88,0x00,0x00,0x00,0x70,0x88,0x88,0x88,0x70,0x00,
0x00,0x00,0xf0,0x88,0x88,0xf0,0x80,0x80,0x00,0x00,0x78,0x88,0x88,0x78,0x08,0x08,
0x00,0x00,0xb0,0xc8,0x80,0x80,0x80,0x00,0x00,0x00,0x78,0x80,0x70,0x08,0xf0,0x00,
0x20,0x20,0x70,0x20,0x20,0x20,0x18,0x00,0x00,0x00,0x88,0x88,0x88,0x98,0x68,0x00,
0x00,0x00,0x88,0x88,0x88,0x50,0x20,0x00,0x00,0x00,0xa8,0xa8,0xa8,0xa8,0x50,0x00,
0x00,0x00,0x88,0x50,0x20,0x50,0x88,0x00,0x00,0x00,0x88,0x88,0x88,0x78,0x08,0x70,
0x00,0x00,0xf8,0x10,0x20,0x40,0xf8,0x00,0x08,0x10,0x10,0x20,0x10,0x10,0x08,0x00,
0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x40,0x20,0x20,0x10,0x20,0x20,0x40,0x00,
0x00,0x68,0xb0,0x00,0x00,0x00,0x00,0x00,0x20,0x50,0x20,0x50,0xa8,0x50,0x00,0x00
};
dst = machine.root_device().memregion(asr733_chr_region)->base();
memcpy(dst, fontdata6x8, asrfontdata_size);
}
INLINE asr_t *get_safe_token(device_t *device)
{
assert(device != NULL);
assert(device->type() == ASR733);
return (asr_t *)downcast<asr733_device *>(device)->token();
}
static DEVICE_START( asr733 )
{
asr_t *asr = get_safe_token(device);
const asr733_init_params_t *params = (const asr733_init_params_t *)device->static_config();
screen_device *screen = device->machine().first_screen();
int width = screen->width();
int height = screen->height();
const rectangle &visarea = screen->visible_area();
asr->last_key_pressed = 0x80;
asr->bitmap = auto_bitmap_ind16_alloc(device->machine(), width, height);
asr->bitmap->fill(0, visarea);
asr->int_callback = params->int_callback;
}
static void asr_field_interrupt(device_t *device)
{
asr_t *asr = get_safe_token(device);
if ((asr->mode & AM_enint_mask) && (asr->new_status_flag)) /* right??? */
{
asr->status |= AS_int_mask;
if (asr->int_callback)
(*asr->int_callback)(device->machine(), 1);
}
else
{
asr->status &= ~AS_int_mask;
if (asr->int_callback)
(*asr->int_callback)(device->machine(), 0);
}
}
static DEVICE_RESET( asr733 )
{
asr_t *asr = get_safe_token(device);
/*asr->OutQueueLen = 0;*/
asr->status = AS_dsr_mask | AS_wrq_mask;
asr->mode = 0;
asr_field_interrupt(device);
}
const device_type ASR733 = &device_creator<asr733_device>;
asr733_device::asr733_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, ASR733, "733 ASR", tag, owner, clock, "asr733", __FILE__)
{
m_token = global_alloc_clear(asr_t);
}
//-------------------------------------------------
// device_config_complete - perform any
// operations now that the configuration is
// complete
//-------------------------------------------------
void asr733_device::device_config_complete()
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void asr733_device::device_start()
{
DEVICE_START_NAME( asr733 )(this);
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void asr733_device::device_reset()
{
DEVICE_RESET_NAME( asr733 )(this);
}
/* write a single char on screen */
static void asr_draw_char(device_t *device, int character, int x, int y, int color)
{
asr_t *asr = get_safe_token(device);
drawgfx_opaque(*asr->bitmap, asr->bitmap->cliprect(), device->machine().gfx[0], character-32, color, 0, 0,
x+1, y);
}
static void asr_linefeed(device_t *device)
{
asr_t *asr = get_safe_token(device);
UINT8 buf[asr_window_width];
int y;
for (y=asr_window_offset_y; y<asr_window_offset_y+asr_window_height-asr_scroll_step; y++)
{
extract_scanline8(*asr->bitmap, asr_window_offset_x, y+asr_scroll_step, asr_window_width, buf);
draw_scanline8(*asr->bitmap, asr_window_offset_x, y, asr_window_width, buf, device->machine().pens);
}
const rectangle asr_scroll_clear_window(
asr_window_offset_x, /* min_x */
asr_window_offset_x+asr_window_width-1, /* max_x */
asr_window_offset_y+asr_window_height-asr_scroll_step, /* min_y */
asr_window_offset_y+asr_window_height-1 /* max_y */
);
asr->bitmap->fill(0, asr_scroll_clear_window);
}
static void asr_transmit(device_t *device, UINT8 data)
{
asr_t *asr = get_safe_token(device);
switch (data)
{
/* aux device control chars */
case 0x05:
/* ENQ -> "WRU": ??? */
break;
case 0x11:
/* DC1 -> "X-ON": transmit on??? */
break;
case 0x12:
/* DC2 -> "X-OFF": transmit off??? */
break;
case 0x13:
/* DC3 -> "TAPE": tape on??? */
break;
case 0x14:
/* DC4 -> "-T-A-P-E-" ("TAPE" with overstrike): tape off??? */
break;
/* printer control chars */
case 0x07:
/* BELL: 250ms beep */
break;
case 0x08:
/* BS: backspace */
if (asr->x > 0)
asr->x--;
break;
case 0x0A:
/* LF: line feed */
asr_linefeed(device);
break;
case 0x0D:
/* CR: carriage return */
asr->x = 0;
break;
default:
if ((data < 0x20) || (data == 0x7f) || (data >= 0x80))
/* ignore control characters */
break;
if (asr->x == 80)
{
asr->x = 0;
asr_linefeed(device);
}
asr_draw_char(device, data, asr_window_offset_x+asr->x*8, asr_window_offset_y+asr_window_height-8, 0);
asr->x++;
break;
}
asr->status |= AS_wrq_mask;
asr->new_status_flag = 1; /* right??? */
asr_field_interrupt(device);
}
#if 0
static void asr_receive_callback(int dummy)
{
asr_t *asr = get_safe_token(device);
(void) dummy;
asr->recv_buf = asr->OutQueue[asr->OutQueueHead];
asr->OutQueueHead = (asr->OutQueueHead + 1) % ASROutQueueSize;
asr->OutQueueLen--;
asr->status |= AS_rrq_mask;
asr->new_status_flag = 1; /* right??? */
asr_field_interrupt(device);
}
#endif
/*
0-7: receive buffer
8: XMITING transmit in progress, 1 if transmitting
9: TIMERR timing error, 1 if error
10: RCR reverse channel receive, not used
"ASR733/33 ID" 1 -> TTY (???) (2270509-9701 pp. G-9 & G-10)
11: WRQ write request, 1 if ready to transmit
12: RRQ read request, 1 if ready to receive
13: DCD data carrier detect, not used
14: DSR data set ready, 1 if online
15: INT interrupt, 1 if interrupt
*/
READ8_DEVICE_HANDLER( asr733_cru_r )
{
asr_t *asr = get_safe_token(device);
int reply = 0;
switch (offset)
{
case 0:
/* receive buffer */
reply = asr->recv_buf;
break;
case 1:
/* status register */
reply = asr->status;
break;
}
return reply;
}
/*
0-7: transmit buffer
8: not used
9: DTR data terminal ready (set to 1)
10: RTS request to send (set to 1)
11: CLRWRQ clear write request (write any value to execute)
12: CLRRRQ clear read request (write any value to execute)
13: CLRNSF clear new status flag - clear DSR/DCD interrupts (write any value to execute)
14: enable interrupts, 1 to enable interrupts
15: diagnostic mode, 0 for normal mode
*/
WRITE8_DEVICE_HANDLER( asr733_cru_w )
{
asr_t *asr = get_safe_token(device);
switch (offset)
{
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
/* transmit buffer */
if (data)
asr->xmit_buf |= 1 << offset;
else
asr->xmit_buf &= ~ (1 << offset);
if ((offset == 7) && (asr->mode & AM_dtr_mask) && (asr->mode & AM_rts_mask)) /* right??? */
asr_transmit(device, asr->xmit_buf);
break;
case 8: /* not used */
break;
case 9: /* data terminal ready (set to 1) */
case 10: /* request to send (set to 1) */
case 14: /* enable interrupts, 1 to enable interrupts */
case 15: /* diagnostic mode, 0 for normal mode */
if (data)
asr->mode |= 1 << (offset - 8);
else
asr->mode &= ~ (1 << (offset - 8));
if (offset == 14)
asr_field_interrupt(device);
break;
case 11: /* clear write request (write any value to execute) */
case 12: /* clear read request (write any value to execute) */
asr->status &= ~ (1 << (offset - 8));
asr_field_interrupt(device);
break;
case 13: /* clear new status flag - whatever it means (write any value to execute) */
asr->new_status_flag = 0;
asr_field_interrupt(device);
break;
}
}
/*
Video refresh
*/
void asr733_refresh(device_t *device, bitmap_ind16 &bitmap, int x, int y)
{
asr_t *asr = get_safe_token(device);
copybitmap(bitmap, *asr->bitmap, 0, 0, x, y, asr->bitmap->cliprect());
}
static const unsigned char key_translate[3][51] =
{
{ /* unshifted */
'1',
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
'0',
':',
'-',
0x1b,
'Q',
'W',
'E',
'R',
'T',
'Y',
'U',
'I',
'O',
'P',
0x0a,
0x0d,
0,
'A',
'S',
'D',
'F',
'G',
'H',
'J',
'K',
'L',
';',
0x08,
0,
0,
'Z',
'X',
'C',
'V',
'B',
'N',
'M',
',',
'.',
'/',
0,
' '
},
{ /* shifted */
'!',
'"',
'#',
'$',
'%',
'&',
'^',
'(',
')',
' ',
'*',
'=',
0x1b,
'Q',
'W',
'E',
'R',
'T',
'Y',
'U',
'I',
'_',
'@',
0x0a,
0x0d,
0,
'A',
'S',
'D',
'F',
'G',
'H',
'J',
0,
'/',
'+',
0x08,
0,
0,
'Z',
'X',
'C',
'V',
'B',
'^',
'|',
'<',
'>',
'?',
0,
' '
},
{ /* control */
'1',
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
'0',
':',
'-',
0x1b,
0x11,
0x17,
0x05,
0x12,
0x14,
0x19,
0x15,
0x09,
0x0f,
0x10,
0x0a,
0x0d,
0,
0x01,
0x13,
0x04,
0x06,
0x07,
0x08,
0x0a,
0x0b,
0x0c,
';',
0x08,
0,
0,
0x1a,
0x18,
0x03,
0x16,
0x02,
0x0e,
0x0d,
',',
'.',
'/',
0,
' '
}
};
/*
keyboard handler: should be called regularly by machine code, for instance
every Video Blank Interrupt.
*/
void asr733_keyboard(device_t *device)
{
asr_t *asr = get_safe_token(device);
enum modifier_state_t
{
/* key modifier states */
unshifted = 0, shift, control,
/* special value to stop repeat if the modifier state changes */
special_debounce = -1
} ;
enum { repeat_delay = 5 /* approx. 1/10s */ };
//UINT16 key_buf[6];
UINT16 key_buf[4];
int i, j;
modifier_state_t modifier_state;
int repeat_mode;
static const char *const keynames[] = { "KEY0", "KEY1", "KEY2", "KEY3" };
/* read current key state */
/* 2008-05 FP: in 733_asr.h there are only 4 input ports defined... */
/* for (i = 0; i < 6; i++) */
for (i = 0; i < 4; i++)
{
key_buf[i] = device->machine().root_device().ioport(keynames[i])->read();
}
/* process key modifiers */
if (key_buf[1] & 0x0200)
modifier_state = control;
else if ((key_buf[2] & 0x0040) || (key_buf[3] & 0x0002))
modifier_state = shift;
else
modifier_state = unshifted;
/* test repeat key */
repeat_mode = key_buf[2] & 0x0020;
/* remove modifier keys */
key_buf[1] &= ~0x0200;
key_buf[2] &= ~0x0060;
key_buf[3] &= ~0x0002;
if (! repeat_mode)
/* reset REPEAT timer if the REPEAT key is not pressed */
asr->repeat_timer = 0;
if ( ! (asr->last_key_pressed & 0x80) && (key_buf[asr->last_key_pressed >> 4] & (1 << (asr->last_key_pressed & 0xf))))
{
/* last key has not been released */
if (modifier_state == asr->last_modifier_state)
{
/* handle REPEAT mode if applicable */
if ((repeat_mode) && (++asr->repeat_timer == repeat_delay))
{
if (asr->status & AS_rrq_mask)
{ /* keyboard buffer full */
asr->repeat_timer--;
}
else
{ /* repeat current key */
asr->status |= AS_rrq_mask;
asr->new_status_flag = 1; /* right??? */
asr_field_interrupt(device);
asr->repeat_timer = 0;
}
}
}
else
{
asr->repeat_timer = 0;
asr->last_modifier_state = special_debounce;
}
}
else
{
asr->last_key_pressed = 0x80;
if (asr->status & AS_rrq_mask)
{ /* keyboard buffer full */
/* do nothing */
}
else
{
//for (i=0; i<6; i++)
for (i=0; i<4; i++)
{
for (j=0; j<16; j++)
{
if (key_buf[i] & (1 << j))
{
asr->last_key_pressed = (i << 4) | j;
asr->last_modifier_state = modifier_state;
asr->recv_buf = (int)key_translate[modifier_state][asr->last_key_pressed];
asr->status |= AS_rrq_mask;
asr->new_status_flag = 1; /* right??? */
asr_field_interrupt(device);
return;
}
}
}
}
}
}
static MACHINE_CONFIG_FRAGMENT( asr733 )
MCFG_PALETTE_INIT_OVERRIDE(asr733_device, asr733)
MACHINE_CONFIG_END
//-------------------------------------------------
// machine_config_additions - return a pointer to
// the device's machine fragment
//-------------------------------------------------
machine_config_constructor asr733_device::device_mconfig_additions() const
{
return MACHINE_CONFIG_NAME( asr733 );
}