The Fix for the problem with SaRuMan-TED V1.2

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eslapion
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The Fix for the problem with SaRuMan-TED V1.2

Post by eslapion » Mon Nov 25, 2019 3:44 am

Once this mod is over, the only way to disable the expansion is to remove the board.

1. Solder a resistor to pull-up CAS - this can be done in 3 different places, just choose which one you prefer.
Have yourself a single standard (through-hole) resistor of value ranging from 4.7kohms to 10khoms - any value within that range will do.
The resistor can be soldered between pins 9 and 16 of U5 or U6 or between FB40 (any lead) and the two 5Vdc leads of the cartridge port connector.

This resistor has virtually no effect when saruman-TED is not installed in your C16 so nothing is 'disabled' or altered here.

2. Cut the wires to the switch on saruman-TED as close to the PCB as possible.

3. Cut pin 11 of saruman-TED

4. install the smallest type of wire you can get (wire wrapping grade 30 AWG is recommended but the type used on old floppy or IDE cables will do as well) between pin 12 of saruman-TED and the center connector for the switch you have just removed.

5. If you have good soldering skills and tools, you can remove R1 from saruman-TED - this step is purely optional.

Photos to come.


Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders

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Re: The Fix for the problem with SaRuMan-TED V1.2

Post by eslapion » Mon Nov 25, 2019 8:08 am

My own modified saruman-TED V1.2
DSC03227.JPG
DSC03228.JPG
The pull-up resistor I added on U6 of my C16.
DSC03230.JPG
Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders

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Re: The Fix for the problem with SaRuMan-TED V1.2

Post by eslapion » Mon Dec 02, 2019 1:21 am

People who don't want to make the resistor installation permanent can use a pair of test hook clips such as those used with logic analyzers.

Example: https://www.ebay.co.uk/itm/SMD-IC-Test- ... 2188929967
Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders

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Re: The Fix for the problem with SaRuMan-TED V1.2

Post by eslapion » Tue Dec 03, 2019 1:44 am

This fix was tested successfully with DIAG264 0.94
Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders

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Re: The Fix for the problem with SaRuMan-TED V1.2

Post by eslapion » Sun Dec 08, 2019 5:34 am

Current PCB is V1.4 and is fully tested with DIAG264.

All the people who got V1.2 and got a refund can get one V1.4 unit for half the normal price. That's 10$US or 9 Euros+shipping.
Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders

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