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k005289.c: correct comments, name functions after pin names on schematic (nw)

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This commit is contained in:
Alex W. Jackson 2014-01-31 08:44:37 +00:00
parent 4b75237697
commit 73debc51f4
3 changed files with 27 additions and 20 deletions
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23
src/emu/sound/k005289.c
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@ -6,7 +6,7 @@
Namco Sound, Amuse by Cab, Nemesis schematics and whoever first
figured out SCC!
The 005289 is a 2 channel sound generator, each channel gets it's
The 005289 is a 2 channel sound generator. Each channel gets its
waveform from a prom (4 bits wide).
(From Nemesis schematics)
@ -18,10 +18,17 @@
The second channel is the same as above except port B is used.
The 005289 has no data bus, so data values written don't matter.
The 005289 has 12 address inputs and 4 control inputs: LD1, LD2, TG1, TG2.
It has no data bus, so data values written don't matter.
When LD1 or LD2 is asserted, the 12 bit value on the address bus is
latched. Each of the two channels has its own latch.
When TG1 or TG2 is asserted, the frequency of the respective channel is
set to the previously latched value.
There are 4 unknown pins, LD1, LD2, TG1, TG2. Two of them look to be
the selector for changing frequency. The other two seem unused.
The 005289 itself is nothing but an address generator. Digital to analog
conversion, volume control and mixing of the channels is all done
externally via resistor networks and 4066 switches and is only implemented
here for convenience.
***************************************************************************/
@ -205,19 +212,19 @@ WRITE8_MEMBER( k005289_device::k005289_control_B_w )
}
WRITE8_MEMBER( k005289_device::k005289_pitch_A_w )
WRITE8_MEMBER( k005289_device::ld1_w )
{
m_freq_latch[0] = 0x1000 - offset;
}
WRITE8_MEMBER( k005289_device::k005289_pitch_B_w )
WRITE8_MEMBER( k005289_device::ld2_w )
{
m_freq_latch[1] = 0x1000 - offset;
}
WRITE8_MEMBER( k005289_device::k005289_keylatch_A_w )
WRITE8_MEMBER( k005289_device::tg1_w )
{
m_stream->update();
@ -225,7 +232,7 @@ WRITE8_MEMBER( k005289_device::k005289_keylatch_A_w )
}
WRITE8_MEMBER( k005289_device::k005289_keylatch_B_w )
WRITE8_MEMBER( k005289_device::tg2_w )
{
m_stream->update();

8
src/emu/sound/k005289.h
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@ -33,10 +33,10 @@ protected:
public:
DECLARE_WRITE8_MEMBER( k005289_control_A_w );
DECLARE_WRITE8_MEMBER( k005289_control_B_w );
DECLARE_WRITE8_MEMBER( k005289_pitch_A_w );
DECLARE_WRITE8_MEMBER( k005289_pitch_B_w );
DECLARE_WRITE8_MEMBER( k005289_keylatch_A_w );
DECLARE_WRITE8_MEMBER( k005289_keylatch_B_w );
DECLARE_WRITE8_MEMBER( ld1_w );
DECLARE_WRITE8_MEMBER( ld2_w );
DECLARE_WRITE8_MEMBER( tg1_w );
DECLARE_WRITE8_MEMBER( tg2_w );
private:
void make_mixer_table(int voices);

16
src/mame/drivers/nemesis.c
View File

@ -385,11 +385,11 @@ ADDRESS_MAP_END
static ADDRESS_MAP_START( sound_map, AS_PROGRAM, 8, nemesis_state )
AM_RANGE(0x0000, 0x3fff) AM_ROM
AM_RANGE(0x4000, 0x47ff) AM_RAM
AM_RANGE(0xa000, 0xafff) AM_DEVWRITE("k005289", k005289_device, k005289_pitch_A_w)
AM_RANGE(0xc000, 0xcfff) AM_DEVWRITE("k005289", k005289_device, k005289_pitch_B_w)
AM_RANGE(0xa000, 0xafff) AM_DEVWRITE("k005289", k005289_device, ld1_w)
AM_RANGE(0xc000, 0xcfff) AM_DEVWRITE("k005289", k005289_device, ld2_w)
AM_RANGE(0xe001, 0xe001) AM_READ(soundlatch_byte_r)
AM_RANGE(0xe003, 0xe003) AM_DEVWRITE("k005289", k005289_device, k005289_keylatch_A_w)
AM_RANGE(0xe004, 0xe004) AM_DEVWRITE("k005289", k005289_device, k005289_keylatch_B_w)
AM_RANGE(0xe003, 0xe003) AM_DEVWRITE("k005289", k005289_device, tg1_w)
AM_RANGE(0xe004, 0xe004) AM_DEVWRITE("k005289", k005289_device, tg2_w)
AM_RANGE(0xe005, 0xe005) AM_DEVWRITE("ay2", ay8910_device, address_w)
AM_RANGE(0xe006, 0xe006) AM_DEVWRITE("ay1", ay8910_device, address_w)
AM_RANGE(0xe086, 0xe086) AM_DEVREAD("ay1", ay8910_device, data_r)
@ -401,12 +401,12 @@ ADDRESS_MAP_END
static ADDRESS_MAP_START( gx400_sound_map, AS_PROGRAM, 8, nemesis_state )
AM_RANGE(0x0000, 0x1fff) AM_ROM
AM_RANGE(0x4000, 0x87ff) AM_RAM AM_SHARE("gx400_shared")
AM_RANGE(0xa000, 0xafff) AM_DEVWRITE("k005289", k005289_device, k005289_pitch_A_w)
AM_RANGE(0xc000, 0xcfff) AM_DEVWRITE("k005289", k005289_device, k005289_pitch_B_w)
AM_RANGE(0xa000, 0xafff) AM_DEVWRITE("k005289", k005289_device, ld1_w)
AM_RANGE(0xc000, 0xcfff) AM_DEVWRITE("k005289", k005289_device, ld2_w)
AM_RANGE(0xe000, 0xe000) AM_DEVWRITE("vlm", vlm5030_device, data_w)
AM_RANGE(0xe001, 0xe001) AM_READ(soundlatch_byte_r)
AM_RANGE(0xe003, 0xe003) AM_DEVWRITE("k005289", k005289_device, k005289_keylatch_A_w)
AM_RANGE(0xe004, 0xe004) AM_DEVWRITE("k005289", k005289_device, k005289_keylatch_B_w)
AM_RANGE(0xe003, 0xe003) AM_DEVWRITE("k005289", k005289_device, tg1_w)
AM_RANGE(0xe004, 0xe004) AM_DEVWRITE("k005289", k005289_device, tg2_w)
AM_RANGE(0xe005, 0xe005) AM_DEVWRITE("ay2", ay8910_device, address_w)
AM_RANGE(0xe006, 0xe006) AM_DEVWRITE("ay1", ay8910_device, address_w)
AM_RANGE(0xe030, 0xe030) AM_WRITE(gx400_speech_start_w)