Serial and parallel dongles for Amiga Test Kit and DiagROM
I recently received a request if, in addition to the Commodore 64 test harness, I could also supply the dongles for the Amiga Test Kit.
The dongles for the Amiga Test Kit (can also be used with Chucky's DiagROM) consist of a serial and 1 parallel loopback adapter.
With the help of this adapter, the tekit can send out signals and see whether they are received back in the correct form, and thus determine whether the ports are functioning.
Serial and parallel dongles for Amiga Test Kit, the design:
After some research it turned out that Keir (The author of Amiga Test Kit ) had made a good description of what those dongles should look like.
Of course, something like this can also be made with wired plugs with a bit of tinkering, but I would like to deliver something professional if I am asked to do so.
Thinking about the design it quickly became clear to me that I wanted to make something that could be used in multiple ways.
Serial and parallel dongles for Amiga Test Kit, 2 times half:
I then came up with the idea of a single PCB that had a serial and parallel connector, which could therefore be used as an adapter for both ports by simply reversing it.
Or if you break, saw or cut the PCB (which has been prepared for this) in half, you simply have 2 test dongles that you can use simultaneously.
The design is made in such a way that if you want to use it as 2 separate halves, it fits into a standard DB25 shell (of course you have to make holes if you want to see the LEDs light up)
Serial and parallel dongles for Amiga Test Kit, operation
The dongles have a number of functions, first of all the LEDs, there are 3 LEDs, which indicate the status of the power supply on the ports (Yellow on the parallel port for +5 volts, and red and green on the Serial port for +12 and -12 volts)
Furthermore, as described earlier, signals are sent out of the port and the loopback plug sends the same signals back into the Amiga.
Of course, only connect and disconnect dongles when the Amiga is turned off!!
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IMO this is the best iteration I've seen of the dongles.
Not only you can have them in a compact and interchangeable
2 in 1 design, you can also cut it in half and use them separately,
with or without a D25 case. You can have them plugged in as they
are and easily check continuity from the pcb to the mb point you
want, without the hassle of the port pins. The leds are a handy
addition to know in a pinch if the voltages are present and correct.
With this and the ATK program I was able to determine the faulty
parallel data traces of my A4000 in a matter of seconds. As always
with this seller, the build quality, the price, the communication and
the packaging are all excellent. Many thanks, highly recommended!