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rollback to earlier today 2

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arcadez2003 2024-08-17 20:40:02 +01:00 committed by GitHub
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commit 00656ef605
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1 changed files with 2 additions and 31 deletions
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33
src/sound/namco54.h
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@ -1,42 +1,13 @@
#ifndef namco54_h
#define namco54_h
/*
* The 4 bit output of each channel is passed through a bandpass filter.
* D0 - D3 are probably TTL level. I will round it up to 4V until measured.
* R1, R2, R3, C1, C2 select the filter specs. R4 is for mixing.
*
* 4.7k
* D3 >--ZZZZ--. .--------+---------.
* | | | |
* 10k | --- c1 Z |
* D2 >--ZZZZ--+ --- Z r3 |
* | | Z |
* 22k | r1 | c2 | |\ 5V |
* D1 >--ZZZZ--+-----ZZZZ----+---------+--||----+ | \| |
* | Z '--|- \ | r4
* 47k | Z r2 | >--+----ZZZZ--> out
* D0 >--ZZZZ--' Z .--|+ /
* | | | /|
* gnd 2V >---' |/ gnd
*
*/
struct namco_54xx_interface
{
int baseclock; /* clock */
int mixing_level; /* volume */
double r1[3];
double r2[3];
double r3[3];
double r4[3];
double c1[3];
double c2[3];
int baseclock; /* clock */
int mixing_level[3]; /* volume of the 3 output ports */
};
int namco_54xx_sh_start(const struct MachineSound *msound);
void namco_54xx_sh_reset(void);
void namco_54xx_sh_stop(void);
void namcoio_54XX_write(int data);