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Title: IGT S+ 10mhz vs 16 mhz - ID BOARD Post by: FOXSSLOTS1 on January 10, 2012, 11:06:32 AM What I have always been told is the easy way to ID a 16mhz board is by the missing sound POT!! Is there something else that stands out? I have 2 boards that seem to be IDENTICAL one with one without the POT, bit switch.
Title: Re: IGT S+ 10mhz vs 16 mhz - ID BOARD Post by: Jim on January 10, 2012, 12:57:14 PM Barry on the 16 mhz board their is another crystal added and a different type sound chip, If the crystal is inserted correctly you can see the number 16 on the crystal can. its located near the main cpu chip in the center of the board, plus the sound pot is gone, that is because you have to adjust the volume using the menu.
that's the main difference. Jim Title: Re: IGT S+ 10mhz vs 16 mhz - ID BOARD Post by: stayouttadabunker on January 10, 2012, 05:14:22 PM Gee Barry...your NAME is on the 16MHz MPU crystals!!! :72-
Below is a snapshot of both boards. 16MHz on top - 10MHz on the bottom. Click on photo to enlarge...>>> Title: Re: IGT S+ 10mhz vs 16 mhz - ID BOARD Post by: FOXSSLOTS1 on January 10, 2012, 09:59:06 PM i see the diff on your 2 boards - I will check mine again tomorrow - the obvious that I saw again was bit swx pot and crystal on one (10) missing on the 16 - I will check further. thanks again.
okay checked today and clearly see the differences now - thank you Title: Re: IGT S+ 10mhz vs 16 mhz - ID BOARD Post by: badbaud on January 15, 2012, 08:06:00 PM Barry,
How to convert a (SX main game chip) 16MHz board with the small sound chip into a standard board that can use any SP game chip. Change the 16MHz crystal to a 10MHz (parallel resonant 22Pf) crystal. Solder in a 1K 1/4 watt resistor at R113 and a .33uF cap at C54 Add a 10K volume control Remove the YM2413 sound chip and add a 28 pin IC socket and a AY38912 sound chip at pads around the YM2413 sound chip location. Remove jumper E15 Now you can use standard SP chips on the board. Title: Re: IGT S+ 10mhz vs 16 mhz - ID BOARD Post by: stayouttadabunker on January 15, 2012, 09:28:50 PM Barry, How to convert a (SX main game chip) 16MHz board with the small sound chip into a standard board that can use any SP game chip. Change the 16MHz crystal to a 10MHz (parallel resonant 22Pf) crystal. Solder in a 1K 1/4 watt resistor at R113 and a .33uF cap at C54 Add a 10K volume control Remove the YM2413 sound chip and add a 28 pin IC socket and a AY38912 sound chip at pads around the YM2413 sound chip location. Remove jumper E15 Now you can use standard SP chips on the board. That's great bench level info badbaud! I have never heard of SP chips that are used on 16MHz referred to as "SX" chips. Did IGT call those chips that? I'm NOT at all knocking anything you've said, in fact, it's just something I've have never come across before - I'm wondering if by chance could the "SX" term you've used, possibly be a typo? If not, where did you hear/get that term from? I'm always learning something new about my favorite IGT platforrm - the S+ :89- Thanks! Title: Re: IGT S+ 10mhz vs 16 mhz - ID BOARD Post by: badbaud on January 16, 2012, 02:59:56 AM You also need to add the 8 position DIP switch to select sound options for the AY3-8912 sound chip.
The SX chips labels were printed by IGT and have their (c) on them. Title: Re: IGT S+ 10mhz vs 16 mhz - ID BOARD Post by: FOXSSLOTS1 on January 16, 2012, 08:04:59 AM now this is the stuff this site is designed for - kudos.
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