YM2149 registers

[xxl]

I have got some questions:

- the order of writing to the registers - which is the best - maybe it does not matter which register we save earlier, which later?

- ENVELOPE SHAPE / CYCLE CONTROL register (Register R13) where lower 4 bits are used, upper 4 bits must be set? cleared? or whether it does not matter and it will not affect the operation of YM

- if during the sound I will write the ENVELOPE SHAPE / CYCLE CONTROL register (Register R13) with the same value, it will affect the sound?

[xxl]

2 hours ago, xxl said:

if during the sound I will write the ENVELOPE SHAPE / CYCLE CONTROL register (Register R13) with the same value, it will affect the sound?

yes, it does.

 

I got the answer to point 3.

and the rest? 🙂

[ijor]

5 hours ago, xxl said:

I have got some questions:

- the order of writing to the registers - which is the best - maybe it does not matter which register we save earlier, which later?

- ENVELOPE SHAPE / CYCLE CONTROL register (Register R13) where lower 4 bits are used, upper 4 bits must be set? cleared? or whether it does not matter and it will not affect the operation of YM

- if during the sound I will write the ENVELOPE SHAPE / CYCLE CONTROL register (Register R13) with the same value, it will affect the sound?

 

1 - Order would matter, of course. Because at the very least it would alter the timing. But not sure exactly which is the best order. I'm not really a musician.

2 - Doesn't matter. The register is 4 bits only.

3 - Yes, it resets the envelope.

[xxl]

thanks 🙂

 

 

 

1. R0,R1, R2,R3, R4,R5, R8,R9,R10, R6,R7,R11,R12,R13 ???

 

 

[jltursan]

All players I've seen always write the registers in a sequential order, no fancy tricks. I guess the writing is so fast that it can't cause any audible glitch.

[xxl]

thanks. I will try but maybe my problem was actually resetting the R13 registry.