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Author Topic: SIMM switch question  (Read 1940 times)

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Offline Ramiro83

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SIMM switch question
« on: July 19, 2014, 07:52:01 PM »
Just wondering, what are the switches for on the top right of the SIMM?

Do they do anything if you change the switch from on to off?
« Last Edit: July 21, 2014, 08:19:49 AM by Ron (r273) »

Offline qbert

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Re: SIMM switch question
« Reply #1 on: July 19, 2014, 10:32:31 PM »
They are used when programming the simm.
Do not change them they will not do anything different  in your machine.
You can also ruin the simm if you try them in a machine with the switches changed.

Rich
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Offline Buzz

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Re: SIMM switch question
« Reply #2 on: July 20, 2014, 02:38:36 AM »
Rich  Actually the dip switch's have nothing to do with programing. What they do is they tell the machine which PXLF file is programed into which simm. ( I know what I'm trying to say and it isn't coming out in a way that makes any sense )
 
Let me try it a different way. Example a 3902 board has three PXLF simm slots, and it make no difference which simm is installed in which slot as Long as the dip switches are set telling the board which file is programed into which simm. Now that I said that I always put the lowest numbered simm into the lowest numbered slot, but you don't have to. I won't bet the farm on this statement but I seem to recall installing a game that only had one PXLF simm and I installed it with the dip switches set all wrong and the game played.
 
Attached are the instruction Eric sent me when I bought my simm burner. Notice he goes into detail about setting the dip switched on a 8 MEG simm before programing, but I've found the 8 MEG will program no matter what the dips are set at.
 
They will do something different if you cange the dip switch settings, they won't work !!!!!!!!!!!!!
« Last Edit: July 20, 2014, 03:08:24 AM by Buzz »
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Offline qbert

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Re: SIMM switch question
« Reply #3 on: July 20, 2014, 04:58:21 AM »
Interesting.  Remember the simm you gave me when I was out in your area a while back, it would not play in my machines until I moved the dip switches to match my other simms. This was true for 500 series and legacy.

The point to Ramiro is by switching them you will not get any additional sounds.

Good information Buzz thanks.

Rich
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Offline vtyler

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Re: SIMM switch question
« Reply #4 on: July 20, 2014, 12:52:08 PM »
dip switch settings according to the schematic.
not 100% sure what it all means

-- SWITCH SETTING --    ---MEMORY RANGE---
4    3      2   1                 
ON OFF ON OFF             4A000000 to 4A7FFFFF
ON OFF OFF ON             4A800000 to 4A8FFFFF     8 MByte
ON OFF OFF OFF           4B000000 to 4B7FFFFF     DECODER
ON OFF ON ON              4C000000 to 4C7FFFFF


OFF ON ON ON             4A000000 to 4AFFFFFF
OFF ON ON OFF           4B000000 to 4BFFFFFF      16 MByte
OFF ON OFF ON            4C000000 to 4CFFFFFF    DECODER


OFF OFF OFF ON          MULTIMEDIA 2 (OLDER 8MB GAMES)
OFF OFF OFF OFF         MULTIMEDIA 2 (8MB & 16MB)












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Re: SIMM switch question
« Reply #5 on: July 20, 2014, 03:15:11 PM »
Interesting.  Remember the simm you gave me when I was out in your area a while back, it would not play in my machines until I moved the dip switches to match my other simms. This was true for 500 series and legacy.

The point to Ramiro is by switching them you will not get any additional sounds.

Good information Buzz thanks.

Rich

Rich I never send a game to someone that hasn't been tested in one of my machines, but that doesn't always hold true with just a sound simm. In order to test a sound simm I would have to have that game already made. It's quite possible that the simm I gave you had just been burned and I never look at the dip switch setting until I install the game. I have never seen a sound simm that didn't need all dip switches turned off.
 
Here's some food for thought. Lets use a DSV00042 bin file, it has a check sum of E9F2 ( you can read a simm using a hex editor program exactly like you would read a eprom ) If I program a DSV00042 with all the dip switches set at the wrong settings. The simm burner I have first erases the simm then program's the file you gave it, then it verifies that it was programed correctly. Now without changing any of the dip switches I can by using the burner read and save that file. If I check that file using a Hex editor the check sum it will see is E9F2
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Re: SIMM switch question
« Reply #6 on: July 20, 2014, 06:06:06 PM »
Maybe the SIMM burner access the memory directly?  The switches look Like they control the behavior of the cpld. I wish I had a jtag device maybe we could boundary scan the cpld.

 

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