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Only call pcspeaker-update on writes to counter2 (performance)

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Fabian 2022-02-15 15:53:57 +01:00
parent 65899d2073
commit 4567188324
1 changed files with 8 additions and 4 deletions
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12
src/pit.js
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@ -62,7 +62,10 @@ function PIT(cpu, bus)
cpu.io.register_write(0x40, this, function(data) { this.counter_write(0, data); });
cpu.io.register_write(0x41, this, function(data) { this.counter_write(1, data); });
cpu.io.register_write(0x42, this, function(data) { this.counter_write(2, data); });
cpu.io.register_write(0x42, this, function(data) {
this.counter_write(2, data);
this.bus.send("pcspeaker-update", [this.counter_mode[2], this.counter_reload[2]]);
});
cpu.io.register_write(0x43, this, this.port43_write);
}
@ -259,8 +262,6 @@ PIT.prototype.counter_write = function(i, value)
{
this.counter_next_low[i] ^= 1;
}
this.bus.send("pcspeaker-update", [this.counter_mode[2], this.counter_reload[2]]);
};
PIT.prototype.port43_write = function(reg_byte)
@ -337,7 +338,10 @@ PIT.prototype.port43_write = function(reg_byte)
this.counter_mode[i] = mode;
this.counter_read_mode[i] = read_mode;
this.bus.send("pcspeaker-update", [this.counter_mode[2], this.counter_reload[2]]);
if(i === 2)
{
this.bus.send("pcspeaker-update", [this.counter_mode[2], this.counter_reload[2]]);
}
};
PIT.prototype.dump = function()