10.738633MHz oscillator / crystal for tms9918

Por st1mpy

Paladin (900)

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16-12-2009, 12:15

Do anyone know where I can get hold of the 10.738633MHz crystal / oscillator for tms9918? (Other than ripping one out of a MSX). Or how do I generate this frequency from other sources?

Or do anyone have a machine that they are breaking for parts?

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Por Eugeny_Brychkov

Paragon (1232)

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16-12-2009, 20:46

21.47727MHz / 2
Precision should be 0.005% and I doubt you can make it without crystal oscillator

Por st1mpy

Paladin (900)

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16-12-2009, 20:56

Where can I get this crystal oscillator? I'm guessing it is not common.

Por RetroTechie

Paragon (1563)

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16-12-2009, 23:38

Digikey website says it has them, not sure if they deliver to private persons or only to businesses. In the UK, I found this one: www.viewcom.force9.co.uk/data/crystal1.htm (not sure if that's up to date).

When you decide to order, and have received the part(s), let us know if it's the right thing?

Por st1mpy

Paladin (900)

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17-12-2009, 09:54

I saw the Digikey site before as well, what they sell should work.
Also, it seems to be relatively easy to get hold of one in Japan as well.

But I decided to rip one out of another hardware... ripping one out of a cheap NTSC NES/SNES should be no crime as there are plenty of them. Plus other parts are worth getting like the PPU from NES for a little experiment later.
I could not find a cheap US/Japanese import one in the UK, so I decided to get a NTSC Super Gameboy cartridge. I think there is supposed to be one inside that.

Por st1mpy

Paladin (900)

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09-01-2010, 14:12

I got the Super Gameboy cartridge... opened it up, but there is no oscillator inside that I want. It's taking the clock signal from SNES. I should have got a PAL VDP so that I can get parts easier. There are a couple of 64KB SRAMs and obviously a Z80, so it's worth it for parts I guess. And I'm not going to be mad enough to use this to make Gameboy games playable on MSXs.

Anyway, I'm supposed to be receiving another MSX1 so that'll become the parts machine then...

Por Eugeny_Brychkov

Paragon (1232)

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09-01-2010, 22:20

I can't believe you will kill good ancient piece of hardware only for transplanted oscillator Smile That's like tomb raiding...

What are you building using 9918? Is it standalone device or you can source clock from somewhere else (e.g. from another MSX you will insert your invention into)?

Por st1mpy

Paladin (900)

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09-01-2010, 23:59

There are various things I'm thinking of doing, but some of them are standalone (or outside the MSX) hence I wanted the oscillator.

I was going to start with making something with the VDP + Arduino (or just Atmel chips) just to display something on a monitor.

Then, I was going to connect the above, or make it into something that can be connected to a PC (USB/ISA/PCI etc) so that I can have the VDP accessible from a PC.

And ultimately develop that until I have a lot of MSX component on a board (may be part FPGA) that is connected to a PC. (Kind of a hybrid MSX-PC hardware).

I could change my mind and try to build something connected to a MSX too.

Por RetroTechie

Paragon (1563)

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10-01-2010, 01:45

I can't believe you will kill good ancient piece of hardware only for transplanted oscillator Smile That's like tomb raiding...
Well that depends on the hardware in question. Even if it's old and you might consider it a shame to rip parts from... if it's common and cheap enough, why not?

My surprise is the other way round: why go through the hassle of finding & buying an MSX1, and rip out a (used, old) Xtal, leaving you with an almost (but not) functional machine, if all you wanted was that Xtal? And you can easily order just that - cheap, brand new? Question

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