One chip MSX improvement project

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By caro

Champion (512)

caro's picture

12-05-2013, 18:21

Ace wrote:

The SCC chip has 5 sound channels, right?

Yes.

Ace wrote:

Is there some way to alter the SCC code to adjust the volume levels of these channels individually rather than adjusting the overall volume level of the SCC?

The level of each of the five channels can be set independently of the four bit code level recorded in the registers for each channel. I see no reason to adjust the levels manually, as this is not provided for in the design of the chip SCC.

By Ace

Resident (53)

Ace's picture

12-05-2013, 18:24

The thing is that it seems like one of the sound channels it being output at the wrong volume as when I watch this video: https://www.youtube.com/watch?v=SUL8rkAO3qg

Some of the notes appear to be at different volume levels. This is my only reference for audio off a real MSX (this is recorded off a Sony F1-XV). I'm not sure if it's an imperfection of the FPGA simulation of the SCC chip or one of the sound channels being output at too low a volume level.

By KdL

Paragon (1415)

KdL's picture

14-05-2013, 03:54

spl wrote:
KdL wrote:

Yep, thanks! The actual flow of improvement of 1chipMSX is started with the ZEXALL compliancy of CPU.
Now I think that the priority of my todo list is to improving the compatibilty of VDP and not other.
Step by step we will come to perfection... or at least I think!!! Murdoch

Actually, I think VDP is the absolute main priority Smile I still use the 2.3 update... it's for me the best one and I can enjoy also the Playsoniq Smile Thanks for your great work. Actully I don't care about 2+ if 2 is not complete... ^-^

like+1 to your opinion, thx! Wink

By Philip

Champion (379)

Philip's picture

14-05-2013, 20:17

Does this look like that Zemmix Neo ?
Is the latest OCM pack from kdl available for download somewhere ?

By KdL

Paragon (1415)

KdL's picture

15-05-2013, 16:51

Hi Philip, the ocm-pld pack v3.2 final will be ready in next weeks.
No Beta or RC will be release again for it. Pls, be patients, thx!!! Wink

Yep, my Zemmix Neo:
- The same hardware of OCM (Altera Cyclone I) inside of an alluminium rock box.
- With a look very impressive that remembers me the Grendizer UFO Robot.
- The hilarious MSX-SP (MSX Superman Pantsu).

By mygodess

Champion (275)

mygodess's picture

15-05-2013, 17:08

Actually Zemmix Neo is not exactly same as OCM.
1. Has scanline generator function inside with VGA High mode. (DIP 2,3 ON)
2. USB Keyboard function on USB port 2. (Just direct connection with PS/2. Cause it is not compatible with HID keyboard)

Anyways, Thanks KdL Smile

By KdL

Paragon (1415)

KdL's picture

16-05-2013, 02:17

mygodess wrote:

Actually Zemmix Neo is not exactly same as OCM.
1. Has scanline generator function inside with VGA High mode. (DIP 2,3 ON)
2. USB Keyboard function on USB port 2. (Just direct connection with PS/2. Cause it is not compatible with HID keyboard)

Anyways, Thanks KdL Smile

Ehm, Yes! For the precision I mean the same hardware, the Cyclone.
But not the same firmware (PLD) that in default configuration have differences.
Running Naked in a Field of Flowers Running Naked in a Field of Flowers Running Naked in a Field of Flowers

By KdL

Paragon (1415)

KdL's picture

16-05-2013, 03:57

I'm sorry. I've changed the BIOSes again... All them will be ready with OCM-PLD Pack v3.2
I repeat, be patients, the website will remain in stand-by for a few weeks...

Kind Regards! :D

By KdL

Paragon (1415)

KdL's picture

16-05-2013, 05:14

Additional info: The Zemmix Neo have an analog luminance regulator that help to setup the scanline on your monitor! Very nice function.

RGB LUMINANCE REGULATOR:

A minor difference: all the LEDs are red (not red and green like OCM); the power is LED9 but in OCM is LED0. The OCM-PLD v3.x have a soft-regulator with a different luminance for the two colors. The luminance of LED9 is poor in Zemmix Neo but I have no idea if was their choice. A fix to get the same luminance will be possible...

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