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tms5200 clock frequency
#136479 - 01/04/08 01:23 AM
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I am measuring clocks on my Money Money pcb but I have a problem with the tms5200 clock.
The frequency counter measure a clock of 565khz instead of 640khz as stated in mame.
The problem is that there isn't a resonator near the tms5200. The clock pin is connected to some resistors, capacitors and transistors. it is possible also that the trace goes to the 3.58mhz osc but I can't follow anymore the traces.
I believe the clock is made on the pcb with discrete components or discrete components are used as divisors
In this case, what value should be put in mame?
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Re: tms5200 clock frequency
[Re: Kold666]
#221321 - 05/06/10 06:00 AM
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> I am measuring clocks on my Money Money pcb but I have a problem with the tms5200
> clock.
>
> The frequency counter measure a clock of 565khz instead of 640khz as stated in mame.
> The problem is that there isn't a resonator near the tms5200. The clock pin is
> connected to some resistors, capacitors and transistors. it is possible also that the
> trace goes to the 3.58mhz osc but I can't follow anymore the traces.
>
> I believe the clock is made on the pcb with discrete components or discrete
> components are used as divisors
> In this case, what value should be put in mame?
640khz. Try measuring the ROMCLK pin of the chip, it should measure 160khz (it is the main clock / 4). trying to directly measure the clock at the OSC pin, given that money money uses the tms5200 in RC clock mode and not external clock mode, will always throw off the result, usually slowing down the clock speed significantly. This is true for all chips which use RC clocks.
LN
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"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
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Stiletto |
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They're always after me Lucky ROMS!
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Re: tms5200 clock frequency
[Re: Lord Nightmare]
#221326 - 05/06/10 07:33 AM
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> > I am measuring clocks on my Money Money pcb but I have a problem with the tms5200
> > clock.
> >
> > The frequency counter measure a clock of 565khz instead of 640khz as stated in
> mame.
> > The problem is that there isn't a resonator near the tms5200. The clock pin is
> > connected to some resistors, capacitors and transistors. it is possible also that
> the
> > trace goes to the 3.58mhz osc but I can't follow anymore the traces.
> >
> > I believe the clock is made on the pcb with discrete components or discrete
> > components are used as divisors
> > In this case, what value should be put in mame?
>
> 640khz. Try measuring the ROMCLK pin of the chip, it should measure 160khz (it is the
> main clock / 4). trying to directly measure the clock at the OSC pin, given that
> money money uses the tms5200 in RC clock mode and not external clock mode, will
> always throw off the result, usually slowing down the clock speed significantly. This
> is true for all chips which use RC clocks.
The original message was from over two years ago... oh well, it'll help someone, I guess...
- Stiletto
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Re: tms5200 clock frequency
[Re: Stiletto]
#222141 - 05/18/10 10:07 AM
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> > > I am measuring clocks on my Money Money pcb but I have a problem with the tms5200
> > > clock.
> > >
> > > The frequency counter measure a clock of 565khz instead of 640khz as stated in
> > mame.
> > > The problem is that there isn't a resonator near the tms5200. The clock pin is
> > > connected to some resistors, capacitors and transistors. it is possible also that
> > the
> > > trace goes to the 3.58mhz osc but I can't follow anymore the traces.
> > >
> > > I believe the clock is made on the pcb with discrete components or discrete
> > > components are used as divisors
> > > In this case, what value should be put in mame?
> >
> > 640khz. Try measuring the ROMCLK pin of the chip, it should measure 160khz (it is
> the
> > main clock / 4). trying to directly measure the clock at the OSC pin, given that
> > money money uses the tms5200 in RC clock mode and not external clock mode, will
> > always throw off the result, usually slowing down the clock speed significantly.
> This
> > is true for all chips which use RC clocks.
>
>
>
> The original message was from over two years ago... oh well, it'll help someone, I
> guess...
>
> - Stiletto
Indeed. I just watched kold666's youtube video (http://www.youtube.com/watch?v=cd9CIy6h8M4&fmt=18) of his money money pcb too, and I think 640khz may be too slow (or someone messed with the frequency pot on the pcb sometime since the factory.)
The 'tromba' channel and the other correct analog sounds (currently incorrect in mame) can also be heard.
LN
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"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
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Re: tms5200 clock frequency
[Re: Lord Nightmare]
#238358 - 11/08/10 05:37 PM
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> > > > I am measuring clocks on my Money Money pcb but I have a problem with the
> tms5200
> > > > clock.
> > > >
> > > > The frequency counter measure a clock of 565khz instead of 640khz as stated in
> > > mame.
> > > > The problem is that there isn't a resonator near the tms5200. The clock pin is
> > > > connected to some resistors, capacitors and transistors. it is possible also
> that
> > > the
> > > > trace goes to the 3.58mhz osc but I can't follow anymore the traces.
> > > >
> > > > I believe the clock is made on the pcb with discrete components or discrete
> > > > components are used as divisors
> > > > In this case, what value should be put in mame?
> > >
> > > 640khz. Try measuring the ROMCLK pin of the chip, it should measure 160khz (it is
> > the
> > > main clock / 4). trying to directly measure the clock at the OSC pin, given that
> > > money money uses the tms5200 in RC clock mode and not external clock mode, will
> > > always throw off the result, usually slowing down the clock speed significantly.
> > This
> > > is true for all chips which use RC clocks.
> >
> >
> >
> > The original message was from over two years ago... oh well, it'll help someone, I
> > guess...
> >
> > - Stiletto
>
> Indeed. I just watched kold666's youtube video (
> http://www.youtube.com/watch?v=cd9CIy6h8M4&fmt=18) of his money money pcb too,
> and I think 640khz may be too slow (or someone messed with the frequency pot on the
> pcb sometime since the factory.)
> The 'tromba' channel and the other correct analog sounds (currently incorrect in
> mame) can also be heard.
>
> LN
on the pcb there isn't a pot to adjust the frequency, it's fixed!
and yes, it's 160khz on romclk
and sorry for my late reply but I don't usually follow this board 
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