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**Reel Slots** Gaming Machines => Bally Reel Games => Topic started by: GOS on April 11, 2016, 05:05:08 AM

Title: BALLY PRO - S5500 - MAINS
Post by: GOS on April 11, 2016, 05:05:08 AM

i have a s5500 with a U3 with a broken pin - my question is do all the mains have to be the same manufacture/speed 27c512s?  I have 27c512-120 

Title: Re: BALLY PRO - S5500 - MAINS
Post by: rokgpsman on April 11, 2016, 07:30:45 AM

My experience is that they don't all have to be the same speed or brand/manufacturer. If the -120 is what was originally in the board I'd stick with using another one that is -120 or faster, which would be a lower number like -100, -90 etc.

The microprocessor chip on the mpu board has a timing cycle to read the data from the mains chips, as long as the mains is ready when that happens all is ok.

Title: Re: BALLY PRO - S5500 - MAINS
Post by: dhellis on April 11, 2016, 09:50:55 AM

As long as the access time is faster than the CPU then any chip as fast or faster than that can be used.

As an example, a CPU chip that runs at 2 Mhz would need ram or eprom chips with an access time
of 500 nano seconds or faster. Your -120 chip would work with any processor with a speed of 8.3 Mhz