MSX Blaster : wrong expectations ?

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By Manuel

Ascended (16955)

Аватар пользователя Manuel

04-11-2019, 21:32

Two things:
1. PSG is part of any MSX, so also your 8250. So almost any MSX game will make sound on it. You can also try in BASIC, just boot to BASIC and type: PLAY"CDE" Should produce sound, unless your MSX or your cable are not OK.
2. What cartridge is that exactly? Please show us, as I doubt it's a PSG. You anyway don't need it for PSG sound.

By MarkL

Supporter (15)

Аватар пользователя MarkL

04-11-2019, 22:23

Of course I know that a PSG chip is part of any MSX. And yes it plays correctly CDE to my sparse musical knowledge.
I cannot quite remember what sort of Japanese cartridge it is. It is all hyroglyphic to me.
This is some ancient warrior strategy game with a map showing quite a lot of small counties or the like.
Can you please link some DSK-image with a PSG sound that reportedly is working to countercheck ?
I don't know what is going on...
I just tested the following from TOSEC: Haradius,Vectron,Zanac Ex,1942 and a few more. They are all dead quiet via the mono RCA output on back of the 8250.

By Pentarou

Champion (285)

Аватар пользователя Pentarou

04-11-2019, 23:03

What are you using to launch these TOSEC ROM games?

By Meits

Scribe (5993)

Аватар пользователя Meits

04-11-2019, 23:43

There are 3 RCA outputs on the back of the 8250. Two of them are video.

By Parn

Hero (606)

Аватар пользователя Parn

05-11-2019, 12:57

I'm late to the discussion but I'm fairly sure this "blaster" thing in the sound cartridges was inspired by the PC Sound Blaster sound card series. I would love a "catch-all" cartridge with support for a lot of sound chips. It could be FPGA, I wouldn't really mind. I'm currently not a fan of routing stereo high-quality sound back into the MSX (like some cartridges do) because it robs me of the possibility of mixing them externally for greater sound quality and keeping stereo support. I would like to mod my SFG (a clone) but I'm too afraid to touch it.

About @MarkL's issues, maybe the loader he's using is forcing the use of an alternative PSG port to circumvent balance issues. In the case of the (probably) japanese game, if it's a later Koei game it may not use the PSG at all. Why don't you share a picture of the cart with us, @MarkL? Smile

By MarkL

Supporter (15)

Аватар пользователя MarkL

05-11-2019, 18:21

I am launching those games from .dsk files on my GOTEK drive internally adapted as A:

This cart is the only (but useless) game that gives agreeable PSG sound in my opinion:

By MarkL

Supporter (15)

Аватар пользователя MarkL

05-11-2019, 20:02

I have got the culprit! You can only have PSG sound if you remove that MSXblaster. I think I have read of a patch around here, maybe ?
It is rather annoying to ever change the carts in and out.

But I still cannot recect the feeling that this 8250 is meorizing some paramters in CMOS too. I have replaced the battery lately... I have no information though what it is storing exactly. Maybe sound options, too ?

By Pentarou

Champion (285)

Аватар пользователя Pentarou

05-11-2019, 20:09

Game is Sangokushi (link), but there's nothing unusual in it.

Reason why I asked what's your launcher, is because I had the same problem you have (no PSG sounds) by using Sofarun to launch some ROMS.
As Parn wrote above, I had accidentally enabled one of the options that redirects the PSG to the 2nd PSG.
Since some of the games you named are (originally) ROM and not disks (1941, Zanac-ex), I thought the problem could be similar.

Edit:
That's very strange, is the MSX-Blaster causing the PSG sounds to be muted?

By Parn

Hero (606)

Аватар пользователя Parn

05-11-2019, 21:59

Now that we know the games don't have sound when the MSX-Blaster is connected, I think I understand what is happening. I don't understand the electronics behind it, but I'm guessing there is some kind of imbalance between the MSX-Blaster sound output and the internal NMS sound output. I know it doesn't seem to make much sense, but the opposite happened in my Gradiente Expert when I connected my FM-X cartridge from DDX: it made everything louder, internal noise and all.

Doesn't the NMS-8250 have that sound circuit bug that makes internal sound almost inaudible when any external sound source is connected?

By Manuel

Ascended (16955)

Аватар пользователя Manuel

05-11-2019, 22:27

That's probably the issue here indeed, Parn. To fix this would require some modifications o the 8250's PCB somewhere, as far as I know (I'm no electronics expert either).

The CMOS only memorizes the date/time and some screen settings and other (quite useless) settings. See the SET SCREEN command. No sound stuff.

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