Megaflashrom: I can't hear the audio

صفحة 4/6
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بواسطة Creepy

Champion (335)

صورة Creepy

04-11-2010, 13:45

Mine also has some mods (oh hai Repair-Bas Wink ) so I would not call mine exactly standard either Smile

بواسطة Creepy

Champion (335)

صورة Creepy

04-11-2010, 22:36

Just to be sure: Do you mean "resistor" in stead of "transistor" right? And I can just got line 49 and put two of them in between? And do you mean 2 or 3 Ohm, or 2,3KOhm? My electronica knowledge is buried way to deep Wink

بواسطة bartl68

Expert (86)

صورة bartl68

05-11-2010, 08:08

a "weerstand" is a dutch word for it, and the value?, i thought 2,3Ohm and you need the put 2 of them if you switch from slot, so slot 1 with this one and ofcourse also slot 2....

بواسطة Creepy

Champion (335)

صورة Creepy

05-11-2010, 09:20

Ah, ok, een weerstand dus. En 1 voor slot 1 en 1 voor slot 2. Heb je misschien een wat duidelijkere foto? Dan is de waarde van de weerstand ook gelijk te controleren.

Ah, ok, A resistor. And 1 for slot 1 and 1 for slot 2. Do you happen to have a more clearer picture? Then we can check the resistor's value as well.

بواسطة bartl68

Expert (86)

صورة bartl68

05-11-2010, 14:30

have taken another picture where you can clearly see things Wink

link : http://www.mijnalbum.nl/GroteFoto-UPH3IEDZ.jpg

بواسطة bartl68

Expert (86)

صورة bartl68

05-11-2010, 14:53

i also have the same problem before, but i fix it like using 2 transistors (value 2,3 Ohm) from the pin 49 leg of the cart to the pcb, with good results!!

see link : http://www.mijnalbum.nl/Foto-NPHJDBPA.jpg : notice the red circle !!!._,

i remove this picture with a better one

link : http://www.mijnalbum.nl/GroteFoto-UPH3IEDZ.jpg

بواسطة Creepy

Champion (335)

صورة Creepy

05-11-2010, 16:17

The resistor is a 2200 Ohm (2.2KOhm) one btw.

بواسطة Repair-Bas

Paragon (1159)

صورة Repair-Bas

05-11-2010, 17:06

With that resistor you can change the extern sound to lower soundlevel.
But the problem is with the Flash SCC+ cart, that the PSG is almost to a zero sound level.
Only with that cart, with a normal SCC cart everthing is perfect.

It looks like a the Flash cart uses the same adresses as the internal PSG.
Then you have a problem

بواسطة Creepy

Champion (335)

صورة Creepy

22-11-2010, 21:18

As posted in http://www.msx.org/forumtopic11811p15.html, bartl68 fix works like a charm! But a new problems arose ;) When putting the Megaflashrom together with an FM-PAK in a slotexpander, the FM-PAK audio cannot be heard! Somehow the audio goes into the Megaflashrom SCC cart. This clearly is a problem with that cart. The same happens with a Philips Music module. Adding a resistor inside the cart should solve all these problems. I have yet to test the slotexpander/megaflashrom/fm-pak combo inside another MSX, but its a good change this problems happens with other MSX'es as well.

بواسطة bartl68

Expert (86)

صورة bartl68

23-11-2010, 08:23

could be, but that's why i chose for a 3rd slot into my nms8255 instead of a slot expander Hannibal

صفحة 4/6
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