static void generic_access(const device_config *device, offs_t offset)
{
tms9927_state *tms = get_safe_token(device);
switch (offset)
{
case 0x07: /* Processor Self Load */
case 0x0f: /* Non-processor self-load */
if (tms->selfload != NULL)
{
int cur;
for (cur = 0; cur < 7; cur++)
tms9927_w(device, cur, tms->selfload[cur]);
for (cur = 0; cur < 1; cur++)
tms9927_w(device, cur + 0xc, tms->selfload[cur + 7]);
}
else
popmessage("tms9927: self-load initiated with no PROM!");
/* processor self-load waits with reset enabled;
non-processor just goes ahead */
tms->reset = (offset == 0x07);
break;
case 0x0a: /* Reset */
if (!tms->reset)
{
video_screen_update_now(tms->screen);
tms->reset = TRUE;
}
break;
case 0x0b: /* Up scroll */
mame_printf_debug("Up scroll\n");
video_screen_update_now(tms->screen);
tms->start_datarow = (tms->start_datarow + 1) % DATA_ROWS_PER_FRAME(tms);
break;
case 0x0e: /* Start timing chain */
if (tms->reset)
{
video_screen_update_now(tms->screen);
tms->reset = FALSE;
recompute_parameters(tms, FALSE);
}
break;
}
}
static WRITE8_HANDLER( palette_w )
{
int co;
video_screen_update_now(space->machine->primary_screen);
data &= 0x0f;
co = ((ram_attr[offset] & 0x7F) << 3) | (offset & 0x07);
ram_palette[co] = data;
}
static TIMER_DEVICE_CALLBACK( scanline_callback )
{
int scanline = param;
/* update the video */
video_screen_update_now(timer->machine->primary_screen);
/* on scanline zero, clear any halt condition */
if (scanline == 0)
cputag_set_input_line(timer->machine, "maincpu", INPUT_LINE_HALT, CLEAR_LINE);
/* wrap around at 262 */
scanline++;
if (scanline >= MAX_SCANLINES)
scanline = 0;
/* set the scanline IRQ */
irq_state[2] = 1;
update_interrupts(timer->machine);
/* set the timer for the next one */
timer_device_adjust_oneshot(timer, double_to_attotime(attotime_to_double(video_screen_get_time_until_pos(timer->machine->primary_screen, scanline, 0)) - hblank_offset), scanline);
}
static WRITE_LINE_DEVICE_HANDLER(hsync_changed)
{
/* update any video up to the current scanline */
video_screen_update_now(device->machine->primary_screen);
}
