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Old 03 May 2015, 13:24   #1
Mounty
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Product Warning!

There is a serious design flaw with the Prototypes-Direct HID mouse/joystick adapter.

Thanks to Julian Carter for pointing it out.

Mr Hammill, the designer has used 3.3v pins to connect the adapter to the Amiga. He should have used 5.5v tolerant pins. Take a

look at the picture below for more details:




In fact the chip that Mr Hammill has used (PIC24FJ64GB002) is not capable of being connected to an Amiga. The Amiga needs seven 5V

tolerant I/O pins, and although the diagram above shows seven 5.5v tolerant pins, one of them cannot be used for I/O (pin 15) as

it is used for USB power only, so there are only six 5v tolerant I/O pins on the IC.

Because too much voltage has been applied to these pins there is a risk of overheating.

I recommend that anyone who has purchased one of these adapters from prototypes-direct contact the seller and ask for a full

refund. He should be more than happy to do that considering the circumstances.

Please note: Because Mr Hammill also designed my adapter, that too has the same design flaw. This adapter is the only one of my

products that I did not design myself, and goes to prove the old adage "If you want something done properly, do it yourself".

My adapter will be withdrawn from sale immediately, and redesigned (by myself). in due course.

Moderators please think twice before deleting this post, there is a safety issue here that people need to know about.
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Old 03 May 2015, 18:31   #2
prowler
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Quote:
Originally Posted by Mounty View Post
Moderators please think twice before deleting this post, there is a safety issue here that people need to know about.
We would not dream of deleting your post. Thanks for pointing out the flaw.
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Old 03 May 2015, 20:40   #3
Mounty
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We would not dream of deleting your post. Thanks for pointing out the flaw.
Thanks
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Old 09 May 2015, 07:36   #4
Shadowfire
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As a side note, these types of things may be OK if series resistors are used to limit the power going into the pins. Can't tell without the schematic of the board.
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Old 12 May 2015, 20:33   #5
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Has this info been passed on to other Amiga groups like Aimbay in case they have not seen it here...
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Old 13 May 2015, 21:30   #6
Mounty
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Quote:
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As a side note, these types of things may be OK if series resistors are used to limit the power going into the pins. Can't tell without the schematic of the board.
I can tell you for certain that no series resistors ave been used.

The adapter I bought from this guy is already starting to show signs of instability. After using it for 30 minutes or so the left and down mouse movement goes intermittent.

Quote:
Originally Posted by Megamix View Post
Has this info been passed on to other Amiga groups like Aimbay in case they have not seen it here...
I'm sure it will have filtered through by now.

Last edited by TCD; 13 May 2015 at 21:52. Reason: Back-to-back posts merged.
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Old 13 May 2015, 23:56   #7
amiman99
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I have one of your mouse adapter "Amiga/ST v1.35" using PIC16F62BA.

Is this one correct?

Thanks.
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Old 14 May 2015, 21:02   #8
Mounty
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I have one of your mouse adapter "Amiga/ST v1.35" using PIC16F62BA.

Is this one correct?

Thanks.
Yes that is a completely different adapter.
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