Autotrax southgate serial#
Like so many other home appliances, it’s likely that even your air conditioner has a serial interface buried inside it. Posted in classic hacks Tagged battery, dallas, real time clock, retrocomuting, rtc You could always forgo RTC modules completely and use the power grid as your timebase.
Hackers have been cutting the modules open and adding batteries for years. When the battery went dead, the computer was off the network.
Autotrax southgate mac#
Sun computers kept their MAC address in chips like this. isn’t the first one to perform this hack. Connecting these wires to an external coin cell brought the module back to life. Exposing the internal connections above pins 16 and 20 allowed him to solder two wires on. He broke out his Dremel tool and cut into the potted case. An industrious hacker might even whip up something compatible from modern components. For most people this would mean a search for a compatible replacement. It turns out that the bq3287 is a descendant of the bq3285, except that the battery pin is internally disconnected.
Autotrax southgate code#
If we’re reading the date code right, the module was produced in mid 1995 so we’re well past the advertised 10 year battery life.Īpparently Texas Instruments is the current owner of this design, and they even have a datasheet online. Such is the case with many Dallas Semiconductor models, and the benchmarq bq3287 module was working with. In some cases though, cost savings would take over, and the battery would be incorporated into the module. Often an external coin cell would supply power to the module. These modules were used on computers and all sorts of other equipment, storing time, date, and 100 or so bytes of battery backed SRAM (before the days of cheap, plentiful flash memory). recently ran into a system with a dead Real Time Clock (RTC) module. Sometimes we run into real problems restoring old machines. Posted in Radio Hacks Tagged antenna, antennas, ham radio, poynting vector antenna, radio
If antennas are a mystery to you then we’d suggest you read an introduction to antenna basics to get you started. Though it is a very effective antenna given that it is made from a couple of pieces of wire and a ferrite core it takes most of the length of the space, and as we’re sure Hackaday readers with callsigns will agree a relatively tiny alternative is always very welcome. In the roof space above the room in which this is being written there hangs a traditional dipole for the 20m amateur band. and have a detailed page on the development of their Poynting antenna which takes the reader through the details of its theory and the development of their practical version. The trade-off is that it has an extremely high Q and thus a narrow bandwidth, and since its feeder can become part of its resonant circuit it is notoriously difficult to match to a transmitter.
Its party piece is tiny dimensions, a fraction of the size of a conventional dipole, and it achieves that by the interaction between a magnetic field across the plates of a capacitor in a tuned circuit and the electric field between a very short pair of dipole radiators. The Poynting Vector antenna has been one of those novel designs on the fringes for a while now, it has been variously described as the “Super-T”, or the “flute”. Over the years a number of innovative antenna designs have come from radio amateurs’ experimentation, and it’s one of the more recent we’d like to share with you today following a story about a book describing its theory (Here’s an Amazon link to the book itself).
In particular the field of antennas is where you’ll find a lot of their work, because the barrier to entry can be as low as the cost of a reel of wire. Radio amateurs are inventive people, and though not all of them choose to follow it there is a healthy culture of buildng radio equipment among them.
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