> Ron Wright <[EMAIL PROTECTED]> wrote: > Hi all, > I had ask what the PROM part number was for this IDer. With > these older IDers they are usually simple and programmed to > give a string of 1s to turn on tone and 0s to turn off a tone > and the string is in the CW sequence to give the ID and the > PROM data bit is output to a tone generator.
Yep, and if you go back far enough the generic prom id'er layout started life as a matrix of diodes soldered onto a board. The VHF Engineering and the Hamtronics early cw id units are great examples of diode programmed id circuits before they were replaced by proms. Just thinking out loud... you might even be able to park a small daughter board into the prom socket and with a bit of interesting work retro a diode matrix back in. But my goodness that would be very not practical. The Prom to Eprom adapter board is probably the most practical path. > There is often timing also to give the ID at some interval, > but if working this would not be a problem. Just under 10 min is the typical ham value. > I bet if one had the known ID now in the PROM it could be > figured out in minutes for someone who has a prom programmer. > I've done this for a verity of ROM devices including trunking > info, etc. Much of the programming time is spent with "dip switches" if your programmer address location is not otherwise controlled. > The only problem one often sees is the PROM is so old it is > hard to find. > 73, ron, n9ee/r Well... not really if you're creative. Depending on the actual prom required... I stock them although they are no longer as cheap as they once were. cheers, skipp skipp025 at yahoo.com
