MAMEWorld Forums - EmuChat - Re: tms5200 clock frequency

> 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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