Implement selectable YM2612/YM3834 invalid status port behavior

1 files changed, 6 insertions, 1 deletions

diff --git a/ym2612.h b/ym2612.h
index 8694b3a..130c729 100644
--- a/ym2612.h
+++ b/ym2612.h
@@ -16,6 +16,7 @@
 #define NUM_OPERATORS (4*NUM_CHANNELS)
 
 #define YM_OPT_WAVE_LOG 1
+#define YM_OPT_3834 2
 
 typedef struct {
 	int16_t  *mod_src[2];
@@ -72,6 +73,9 @@ typedef struct {
 	uint32_t    write_cycle;
 	uint32_t    busy_start;
 	uint32_t    busy_cycles;
+	uint32_t    last_status_cycle;
+	uint32_t    invalid_status_decay;
+	uint32_t    status_address_mask;
 	int32_t     volume_mult;
 	int32_t     volume_div;
 	ym_operator operators[NUM_OPERATORS];
@@ -97,6 +101,7 @@ typedef struct {
 	uint8_t     lfo_pm_step;
 	uint8_t     csm_keyon;
 	uint8_t     status;
+	uint8_t     last_status;
 	uint8_t     selected_reg;
 	uint8_t     selected_part;
 	uint8_t     part1_regs[YM_PART1_REGS];
@@ -139,7 +144,7 @@ void ym_run(ym2612_context * context, uint32_t to_cycle);
 void ym_address_write_part1(ym2612_context * context, uint8_t address);
 void ym_address_write_part2(ym2612_context * context, uint8_t address);
 void ym_data_write(ym2612_context * context, uint8_t value);
-uint8_t ym_read_status(ym2612_context * context, uint32_t cycle);
+uint8_t ym_read_status(ym2612_context * context, uint32_t cycle, uint32_t port);
 uint8_t ym_load_gst(ym2612_context * context, FILE * gstfile);
 uint8_t ym_save_gst(ym2612_context * context, FILE * gstfile);
 void ym_print_channel_info(ym2612_context *context, int channel);