One chip MSX improvement project

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By HRA!

Champion (271)

HRA!'s picture

02-04-2021, 16:44

I received an SX-2 for testing.
I will start preparing to port OCM-Kai for SX-2. Wink

https://twitter.com/thara1129/status/1377924550634078214

By erpirao

Paragon (1195)

erpirao's picture

02-04-2021, 17:00

Hi hra !, the x-sm (previous version of the sx2) does not have sound-in enabled on pin 49, can you confirm if the sx2 has that signal connected?
an msx without sound-in, I don't see it interesting
Thanks a lot.

By HRA!

Champion (271)

HRA!'s picture

02-04-2021, 17:21

erpirao wrote:

Hi hra !, the x-sm (previous version of the sx2) does not have sound-in enabled on pin 49, can you confirm if the sx2 has that signal connected?
an msx without sound-in, I don't see it interesting
Thanks a lot.

SOUNDIN is working.
As a test, I installed the "Moero Nettou Baseball'88" into SLOT1 and confirmed that I could hear PCM sound.

SOUNDIN is enabled not only for SX-2 but also for DE0CV+DEOCM.

By HRA!

Champion (271)

HRA!'s picture

02-04-2021, 17:36

https://twitter.com/thara1129/status/1378005914989436930

Moero Nettou Baseball'88 (燃えろ!熱闘野球'88)

By erpirao

Paragon (1195)

erpirao's picture

02-04-2021, 17:36

Thank you very much, great news, the soundIN thing was the issue that held me back.
then now to decide:
DE0CV-DEOCM or sx2

By HRA!

Champion (271)

HRA!'s picture

03-04-2021, 00:30

erpirao wrote:

Thank you very much, great news, the soundIN thing was the issue that held me back.
then now to decide:
DE0CV-DEOCM or sx2

If you are going to buy one, I recommend you to go for the SX-2.

The SX-2 was designed from the beginning as an OCM.
Also, the VGA output of DE0CV is R:4bit, G:4bit, B:4bit, which has a problem of poor color reproduction.
The SX-2 is housed in a nice case. Wink

By AxelStone

Prophet (3020)

AxelStone's picture

03-04-2021, 11:10

Hello HRA!, thanks for your sugestion!. One question about SX-2, the core desgined for it can be ported to Mist FPGAs? I see that have more or less similar capacity.

Thanks!

By HRA!

Champion (271)

HRA!'s picture

03-04-2021, 14:35

AxelStone wrote:

Hello HRA!, thanks for your sugestion!. One question about SX-2, the core desgined for it can be ported to Mist FPGAs? I see that have more or less similar capacity.

Thanks!

I don't have a MiSTer, so I can't promise anything, but I believe it is possible to port it.
I have had some communication with a MiSTer on Facebook. He seems to be interested in the R800 core that I am trying to build.

By AxelStone

Prophet (3020)

AxelStone's picture

03-04-2021, 20:24

HRA! wrote:

I don't have a MiSTer, so I can't promise anything, but I believe it is possible to port it.
I have had some communication with a MiSTer on Facebook. He seems to be interested in the R800 core that I am trying to build.

I know, someone interested should make the port Wink . You comment that some Mister developer already contacted you, should be nice also some Mist developer porting it. In fact, right now Mist and Mister MSX cores are a direct port from Zemmix neo one.

Just for curiosity: considering that original OCM with old Cyclone I and 12KLEs has reached up to MSX2+@8Mhz, 4Mb Ram, FM, double SCC, VDP Turbo mode...how far do you think you can go with this one? MSX Turbo R could fit with 9990 and / or OPL4?

Thanks Smile

By erpirao

Paragon (1195)

erpirao's picture

03-04-2021, 20:45

The problem of the mister is that the current cores do not use the ddr that carries for performance and a large part of the expansion ports are used to manage the SDRAM, so we would enter a conflict, with the pins that can be used for the slots cartridge.
and regarding what the axelstone colleague has asked, I am forgetting to put an opl4 in those 22kle, the opl4 is a much more complex than an opl3.
.

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