MD2 + YM2413 = Jawusumness :D

Started by Tiido Priimägi, September 23, 2009, 07:08:01 AM

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Tiido Priimägi

September 23, 2009, 07:08:01 AM
Mida sa loed ? Nagunii aru ei saa ;)

l_oliveira

#1
September 23, 2009, 08:30:01 AM
I think the YM2413 is supposed to be driven with 3.579545mhz... :)
Is that 4.5mhz crystal the Z80 turbo clock instead ?

Tiido Priimägi

#2
September 23, 2009, 08:33:52 AM
the 4.5MHz is for Z80 overclock, YM gets its clock from the Z80 clock output from the ASIC, no out of tuneness that way between FM and PSG :D
Mida sa loed ? Nagunii aru ei saa ;)

Tiido Priimägi

#3
September 24, 2009, 05:18:44 AM


and the schematic, exactly how it is in my MD2.

The 244 can be replaced with 125, but I did not have one...
Mida sa loed ? Nagunii aru ei saa ;)

viletim

#4
September 26, 2009, 04:36:30 PM
Nice work Tiido.

I was wondering why there is so much flux everywhere, do you not use resin core solder?

Also, what's the big electrolytic for?

Tiido Priimägi

#5
September 26, 2009, 08:29:48 PM
it just seems there's lot of flux, in reality its just a thin layer, but the camera's flash makes it shine back and it looks like there's a lot of it. I have rosin core solder, but additional flux use makes better result... and I have been using additional flux forever.

The big e-cap is to soften the results of 7805 overload (gettings something better and more powerful this or next week) and to filter out lot of VDP generated noises.
Mida sa loed ? Nagunii aru ei saa ;)

l_oliveira

#6
October 03, 2009, 06:06:17 AM
Some types of flux may corrode the copper in the long run....

:x

Tiido Priimägi

#7
October 03, 2009, 07:39:31 AM
that flux is pine wax + spirit, so no harm will come :)
Mida sa loed ? Nagunii aru ei saa ;)

phreak97

#8
October 09, 2009, 10:38:33 PM
I'm interested in this thread, but all the pictures say bandwidth exceeded..

Tiido Priimägi

#9
October 09, 2009, 10:44:15 PM
things will be back after 6 more days... montly bandwidth in fileden got exceeded too early....
Mida sa loed ? Nagunii aru ei saa ;)
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