Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-06-26 06:14:12 +03:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

fix ninjakd2 PCM sample rate to match pcb measurement

Browse Source
This commit is contained in:
Nicola Salmoria 2008-03-18 08:57:13 +00:00
parent ad9f4a0baa
commit a096d73ba4
1 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/mame/drivers/ninjakd2.c
View File

@ -85,6 +85,8 @@ Notes:
all write the 0xF0 "silence" command), however since these games don't have PCM all write the 0xF0 "silence" command), however since these games don't have PCM
samples it seems unlikely that the boards actually have the PCM circuitry. The samples it seems unlikely that the boards actually have the PCM circuitry. The
command written might be a leftover from the code used for Ninja Kid II. command written might be a leftover from the code used for Ninja Kid II.
Atomic Robo-Kid definitely doesn't have the DAC and counters. The other boards
have not been verified.
- Ark Area has no explicit copyright year on the title screen, however it was - Ark Area has no explicit copyright year on the title screen, however it was
reportedly released in December 1987. reportedly released in December 1987.
@ -115,8 +117,6 @@ Notes:
TODO: TODO:
----- -----
- Ninja Kid II PCM sample playback frequency is not verified
- What does the "credit service" dip switch do in Ninja Kid II? - What does the "credit service" dip switch do in Ninja Kid II?
******************************************************************************/ ******************************************************************************/
@ -131,6 +131,11 @@ TODO:
#define MAIN_CLOCK_12 XTAL_12MHz #define MAIN_CLOCK_12 XTAL_12MHz
#define MAIN_CLOCK_5 XTAL_5MHz #define MAIN_CLOCK_5 XTAL_5MHz
// PCM playback is controlled by a 555 timer
#define NE555_FREQUENCY 16300 // measured on PCB
//#define NE555_FREQUENCY (1.0f / (0.693 * (560 + 2*51) * 0.1e-6)) // theoretical: this gives 21.8kHz which is too high
static const INT16* ninjakd2_sampledata; static const INT16* ninjakd2_sampledata;
static UINT8 omegaf_io_protection[3]; static UINT8 omegaf_io_protection[3];
@ -233,7 +238,7 @@ static WRITE8_HANDLER( ninjakd2_pcm_play_w )
++end; ++end;
if (end - start) if (end - start)
sample_start_raw(0, &ninjakd2_sampledata[start], end - start, MAIN_CLOCK_5 / 384, 0); // 13020kHz NOT verified sample_start_raw(0, &ninjakd2_sampledata[start], end - start, NE555_FREQUENCY, 0);
else else
sample_stop(0); sample_stop(0);
} }