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(MESS) upd7220: fixed RDAT command when data to read are larger than the FIFO, this fixes dmv and a5105 text scrolling. (nw)

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This commit is contained in:
Sandro Ronco 2014-08-25 18:21:17 +00:00
parent 595e77a5af
commit 879b643e41
2 changed files with 23 additions and 2 deletions
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24
src/emu/video/upd7220.c
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@ -506,7 +506,7 @@ inline void upd7220_device::read_vram(UINT8 type, UINT8 mod)
if (mod) if (mod)
LOG (("uPD7220 RDAT used with mod = %02x?\n",mod)); LOG (("uPD7220 RDAT used with mod = %02x?\n",mod));
for (int i = 0; i < m_figs.m_dc; i++) while (m_figs.m_dc && m_fifo_ptr < (type ? 15 : 14))
{ {
switch(type) switch(type)
{ {
@ -522,8 +522,12 @@ inline void upd7220_device::read_vram(UINT8 type, UINT8 mod)
break; break;
} }
m_figs.m_dc--;
advance_ead(); advance_ead();
} }
if (m_figs.m_dc == 0)
reset_figs_param();
} }
@ -1371,7 +1375,6 @@ void upd7220_device::process_fifo()
fifo_set_direction(FIFO_READ); fifo_set_direction(FIFO_READ);
read_vram((m_cr & 0x18) >> 3,m_cr & 3); read_vram((m_cr & 0x18) >> 3,m_cr & 3);
reset_figs_param();
m_sr |= UPD7220_SR_DATA_READY; m_sr |= UPD7220_SR_DATA_READY;
break; break;
@ -1410,6 +1413,21 @@ void upd7220_device::process_fifo()
} }
//-------------------------------------------------
// continue command
//-------------------------------------------------
void upd7220_device::continue_command()
{
// continue RDAT command when data to read are larger than the FIFO (a5105 and dmv text scrolling)
if (m_figs.m_dc && translate_command(m_cr) == COMMAND_RDAT)
{
read_vram((m_cr & 0x18) >> 3, m_cr & 3);
m_sr |= UPD7220_SR_DATA_READY;
}
}
//------------------------------------------------- //-------------------------------------------------
// read - // read -
//------------------------------------------------- //-------------------------------------------------
@ -1424,6 +1442,8 @@ READ8_MEMBER( upd7220_device::read )
int flag; int flag;
fifo_set_direction(FIFO_READ); fifo_set_direction(FIFO_READ);
dequeue(&data, &flag); dequeue(&data, &flag);
continue_command();
} }
else else
{ {

1
src/emu/video/upd7220.h
View File

@ -149,6 +149,7 @@ private:
void draw_char(int x, int y); void draw_char(int x, int y);
int translate_command(UINT8 data); int translate_command(UINT8 data);
void process_fifo(); void process_fifo();
void continue_command();
void update_text(bitmap_rgb32 &bitmap, const rectangle &cliprect); void update_text(bitmap_rgb32 &bitmap, const rectangle &cliprect);
void draw_graphics_line(bitmap_rgb32 &bitmap, UINT32 addr, int y, int wd); void draw_graphics_line(bitmap_rgb32 &bitmap, UINT32 addr, int y, int wd);
void update_graphics(bitmap_rgb32 &bitmap, const rectangle &cliprect, int force_bitmap); void update_graphics(bitmap_rgb32 &bitmap, const rectangle &cliprect, int force_bitmap);