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itt3030: scrolling (nw)

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This commit is contained in:
cracyc 2016-05-21 19:17:03 -05:00
parent 50b4b0975c
commit 7b823b8891
2 changed files with 8 additions and 4 deletions
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6
src/devices/video/tms9927.cpp
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@ -104,6 +104,7 @@ void tms9927_device::device_start()
void tms9927_device::device_reset()
{
m_start_datarow = 0;
}
//-------------------------------------------------
@ -286,13 +287,14 @@ void tms9927_device::recompute_parameters(int postload)
/* determine the visible area, avoid division by 0 */
m_visible_hpix = CHARS_PER_DATA_ROW * m_hpixels_per_column;
m_visible_vpix = (LAST_DISP_DATA_ROW + 1) * SCANS_PER_DATA_ROW;
m_visible_vpix = DATA_ROWS_PER_FRAME * SCANS_PER_DATA_ROW;
m_start_datarow = (LAST_DISP_DATA_ROW + 1) % DATA_ROWS_PER_FRAME;
/* determine the horizontal/vertical offsets */
offset_hpix = HSYNC_DELAY * m_hpixels_per_column;
offset_vpix = VERTICAL_DATA_START;
osd_printf_debug("TMS9937: Total = %dx%d, Visible = %dx%d, Offset=%dx%d, Skew=%d\n", m_total_hpix, m_total_vpix, m_visible_hpix, m_visible_vpix, offset_hpix, offset_vpix, SKEW_BITS);
osd_printf_debug("TMS9937: Total = %dx%d, Visible = %dx%d, Offset=%dx%d, Skew=%d, Upscroll=%d\n", m_total_hpix, m_total_vpix, m_visible_hpix, m_visible_vpix, offset_hpix, offset_vpix, SKEW_BITS, m_start_datarow);
/* see if it all makes sense */
m_valid_config = TRUE;

6
src/mame/drivers/itt3030.cpp
View File

@ -350,11 +350,13 @@ WRITE8_MEMBER(itt3030_state::bankh_w)
UINT32 itt3030_state::screen_update( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int start = m_crtc->upscroll_offset();
for(int y = 0; y < 24; y++ )
{
int vramy = (start + y) % 24;
for(int x = 0; x < 80; x++ )
{
UINT8 code = m_vram[x + y*128];
UINT8 code = m_vram[x + vramy*128];
m_gfxdecode->gfx(0)->opaque(bitmap,cliprect, code , 0, 0,0, x*8,y*12);
}
}
@ -484,7 +486,7 @@ ADDRESS_MAP_END
static ADDRESS_MAP_START( itt3030_io, AS_IO, 8, itt3030_state )
ADDRESS_MAP_GLOBAL_MASK(0xff)
AM_RANGE(0x20, 0x26) AM_DEVREADWRITE("crt5027", crt5027_device, read, write)
AM_RANGE(0x20, 0x2f) AM_DEVREADWRITE("crt5027", crt5027_device, read, write)
AM_RANGE(0x30, 0x31) AM_DEVREADWRITE("kbdmcu", i8741_device, upi41_master_r, upi41_master_w)
AM_RANGE(0x32, 0x32) AM_WRITE(beep_w)
AM_RANGE(0x35, 0x35) AM_READ(vsync_r)