Some questions about X16 in general.

xanthrou · Post by **xanthrou** » Thu Jan 28, 2021 11:26 am

I have some other questions about X16.

Since SD sockets can also use MMC cards most of the time, is this the case in X16?

If X16 loses YM2151 in the final, what impact would it deliver to the retro computer?

And is it possible to switch 6502 CPUs with say, like C64?

JimmyDansbo · Post by **JimmyDansbo** » Thu Jan 28, 2021 11:40 am

I believe that MMC uses a different protocol/format than SD ? - Someone will surely correct me of I am wrong ?

If we loose the YM2151, we still have the 16 channel PSG + the ability to play PCM samples through VERA

AFAIK, the C64 actually uses the 6510 and the Commander X16 is going to use the w65c02, they are not pin-compatible

https://eater.net/datasheets/w65c02s.pdf

http://archive.6502.org/datasheets/mos_6510_mpu_nov_1982.pdf

xanthrou · Post by **xanthrou** » Thu Jan 28, 2021 1:06 pm

1 hour ago, JimmyDansbo said:

If we loose the YM2151, we still have the 16 channel PSG + the ability to play PCM samples through VERA

Yeah, but there are more games and programs that use YM chip than the ones with VERA PSG.

JimmyDansbo · Post by **JimmyDansbo** » Thu Jan 28, 2021 1:10 pm

2 minutes ago, xanthrou said:

Yeah, but there are more games and programs that use YM chip than the ones with VERA PSG.

Ok, I am not sure I know any games for the Commander X16 that use the YM2151 chip? If you are talking about games for other platforms, they will anyway need to be rewritten to run on the CX16. Granted, it might be easier to rewrite if the YM2151 is available.

xanthrou · Post by **xanthrou** » Thu Jan 28, 2021 1:31 pm

20 minutes ago, JimmyDansbo said:

Ok, I am not sure I know any games for the Commander X16 that use the YM2151 chip? If you are talking about games for other platforms, they will anyway need to be rewritten to run on the CX16. Granted, it might be easier to rewrite if the YM2151 is available.

To clarify myself better, I meant in the community downloads.

JimmyDansbo · Post by **JimmyDansbo** » Thu Jan 28, 2021 2:08 pm

Well, in any case. If the final product loses the YM2151, I don't think it will have much impact. Most people currently developing for the platform are aware that this is still volatile and things can change drastically from one day to the next. If the YM2151 disappears, more effort will be put into PSG and PCM in VERA. - just my 2 cents

kliepatsch · Post by **kliepatsch** » Thu Jan 28, 2021 2:31 pm

I think they said that IN CASE the supply for the fm chip dries out, they were going to replace it by an FPGA solution.

xanthrou · Post by **xanthrou** » Thu Jan 28, 2021 2:37 pm

2 hours ago, JimmyDansbo said:

I believe that MMC uses a different protocol/format than SD ? - Someone will surely correct me of I am wrong ?

SD sockets are backwards-compatible with MMC cards, jtlyk.

Perifractic · Post by **Perifractic** » Fri Jan 29, 2021 4:19 am

Just for the record there are no plans to remove the YM sound chip and we are trying to lock down the final prototype which still has it at this stage.

Your friend in retro, Perifractic

X16 Visual Design Coordinator

http://youtube.com/perifractic

BruceMcF · Post by **BruceMcF** » Fri Jan 29, 2021 12:13 pm

On 1/28/2021 at 7:40 PM, JimmyDansbo said:

I believe that MMC uses a different protocol/format than SD ? - Someone will surely correct me of I am wrong ?

Nothing definitive, but from a bit of quick googling, it seems possible that the differences in protocol are in their higher speed access methods ... I see multiple SPI mode drivers that bill themselves as SD/MMC drivers.

Now, there may be a difference that those drivers simply check for and handle based on type of card, which is why it is not definitive.