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Changed P4 control to the PROG line, which is more likely. The way to toggle

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the PROG line is to read/write/and/or to ports 4-7. Since the board doesn't
list an 8243 port expander, it is likely the "writes" to port 4 are really
just a mechanism to get the PROG line to toggle to clear the interrupt.
This commit is contained in:
Aaron Giles 2009-01-03 08:44:30 +00:00
parent a783dfc3c6
commit a1e098a078
1 changed files with 8 additions and 7 deletions
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15
src/mame/drivers/videopkr.c
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@ -672,9 +672,10 @@ static READ8_HANDLER( videopkr_t0_latch )
return t0_latch;
}
static WRITE8_HANDLER(p4_w)
static WRITE8_HANDLER( prog_w )
{
cputag_set_input_line(space->machine, "main", 0, CLEAR_LINE); /* clear interrupt FF */
if (!data)
cputag_set_input_line(space->machine, "main", 0, CLEAR_LINE); /* clear interrupt FF */
}
/*************************
@ -877,11 +878,11 @@ static ADDRESS_MAP_START( i8039_readmem, ADDRESS_SPACE_PROGRAM, 8 )
ADDRESS_MAP_END
static ADDRESS_MAP_START( i8039_io_port, ADDRESS_SPACE_IO, 8 )
AM_RANGE(0x00 , 0xff ) AM_READWRITE(videopkr_io_r, videopkr_io_w)
AM_RANGE(MCS48_PORT_P1, MCS48_PORT_P1) AM_READWRITE(videopkr_p1_data_r, videopkr_p1_data_w)
AM_RANGE(MCS48_PORT_P2, MCS48_PORT_P2) AM_READWRITE(videopkr_p2_data_r, videopkr_p2_data_w)
AM_RANGE(MCS48_PORT_P4, MCS48_PORT_P4) AM_WRITE(p4_w)
AM_RANGE(MCS48_PORT_T0, MCS48_PORT_T0) AM_READ(videopkr_t0_latch)
AM_RANGE(0x00, 0xff ) AM_READWRITE(videopkr_io_r, videopkr_io_w)
AM_RANGE(MCS48_PORT_P1, MCS48_PORT_P1 ) AM_READWRITE(videopkr_p1_data_r, videopkr_p1_data_w)
AM_RANGE(MCS48_PORT_P2, MCS48_PORT_P2 ) AM_READWRITE(videopkr_p2_data_r, videopkr_p2_data_w)
AM_RANGE(MCS48_PORT_PROG, MCS48_PORT_PROG) AM_WRITE(prog_w)
AM_RANGE(MCS48_PORT_T0, MCS48_PORT_T0 ) AM_READ(videopkr_t0_latch)
ADDRESS_MAP_END
static ADDRESS_MAP_START( i8039_sound_mem, ADDRESS_SPACE_PROGRAM, 8 )