Help with modifying sound on the SVI-738 MSX

Rookie (29)

14-02-2005, 11:58

Hi everyone!

I guess this topic have been around here before, but anyway, I want to get rid of the distorted and way too high PSG sound on my SVI-738, so I could hear some SCC-sound from my Konami-carts as well.
I found the 738 tech-PDF and a .txt-file with instructions that says I have to remove the 4K7 resistor from R2 and replace it with an 150K resistor.
But the image on the 738 motherboard is quite poor, but I guess the R2 is near the top left corner, beneath the J1, can anyone confirm this?
I have no soldering skills, but I've got some friends who might solve that for me.

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By Algorythms

Champion (287)

14-02-2005, 13:02

There are 10 resistors in a row downwards just below the Monitor and Sound out RCA connectors. It`s number two counting from the connectors. You CAN also solder from the upside. Just snip the resistors legs close to the resistor, and solder the new one onto the old legs. Good luck!
-Dan

By HansO

Paladin (672)

14-02-2005, 13:06

It is the second resistor underneath J1.

I just looked into the pdf (http://www.funet.fi/pub/msx/mirrors/hanso/hwmodsetc/svitechref.pdf), its not that bad, considering the original was a mediocre photocopy. At least I could see the R2 label.

On my list of things to do is a more complete scan of the technical manual, like the BIOS listing.

By NYYRIKKI

Enlighted (5735)

14-02-2005, 13:44

Yup, it's in the top left corner. Don't worry... When you open the computer "R2" is printed to motherboard.

By MSX_bear

Rookie (29)

14-02-2005, 17:35

Thanks so much for your help!

By Gorgane

Resident (62)

14-02-2005, 17:52

I thought about doing this same upgrade on my 728, but the damn thing is so small and in a very tricky place. The keyboard cable is also a problem because it's not too long, seems very brittle and can't be deattached from the motherboard. In the end i came to the conclusion that it's easier to buy a better (MSX2) machine and sell this piece of shit. Hopefully i can get that better machine soon... :/

By [D-Tail]

Ascended (8243)

14-02-2005, 20:12

Spectravideo MSXes are quite stylish, very much unlike philips MSXes

By Gorgane

Resident (62)

14-02-2005, 20:49

Spectravideo MSXes are quite stylish, very much unlike philips MSXes

Stylish they may be, but quality wise they are total crap. It's easy to see that they were made in Hong Kong instead of Japan when you look at the motherboard. There's more glue that actual components on the PCB'(s)! They also have the worst mechanical keyboards in the history of computing.

Why must they be so common here in Finland?!! I would trade mine for a Philips MSX2 any day!

By MSX_bear

Rookie (29)

14-02-2005, 21:09

I've seen some complaints about the SVI-models keyboard, but I totaly disagree! It's one of the nicest among old computers. But the opinion is like a pair of buttocks - divided!

By rif

Supporter (4)

14-02-2005, 21:54

They also have the worst mechanical keyboards in the history of computing.

Ha-ha!

I think the keyboard on the SVI 738 is resonable, but I think you are spot on when considering the pre-MSX SV328, the so called real keyboard was not very good.

In plastic shape and style the SVI738 has always been one of my favorites. Also its prepared upgradability from MSX1 to MSX2 was a scoop once we realised what was possible.

By Sonic_aka_T

Enlighted (4130)

14-02-2005, 22:12

The SVI 738 is one of the sexiest things out there... especially considering the time in which it was built...