At 08:58 PM 01/29/10, you wrote: >Re: GLB (Eprom, Prom and Diode Matrix IDer's) > > > >Can anyone burn a 2716 Prom chip for a GLB ID-1 Ide'er? > > >Not a standard hex file. have some docs. > > > Actually it's is a standard hex file. It's just created > > a bit weirdly. > >There seems to be two different themes followed by a number >of Eprom ID units. One method is what below is interestingly >called the bit stream method and the other is more of a >programming table look-up method. The former seems to be >much more common for the popular Eprom Models/Brands.
Yep. No diode/no bit in the EPROM for a space, a programmed bit for a dit, three bits in sequence for a dah. > > The binary pattern in it contains the call sign as a 1-bit stream. > > You could have multiple call signs as data bit 0 was one call > > sign, data bit 1 was another, data bit 2 was a third, etc. > > > > I forget if a "1" programmed bit was tone off or tone on, but > > location 0 had to be programmed with the tone off. > > > > Just read the old chip, map the bits on a piece of graph paper, > > and it will all fall into place. > >In most cases the pattern will thankfully fall into place. > > > Just map out what you want as a new call sign (or several > > call signs) as a string of bits, then map them as two digit > > hex characters, then program the PROM accordingly. > >If he/you can't find a programming source, I and a number of >other group members can do it easily enough. > > > While Hex Workshop makes it a lot easier, I've used Notepad > > to do the editing and the calculator in windows (in Scientific mode) > > to do the binary to hex (and back) conversions. > > Hex Workshiop is available at <http://www.bpsoft.com> > >Hex Workshop is very nice... > > > I've only seen one of these IDers, and it was wired with a > > couple of extra mods... > > 1) it had a 5vDC wall wart transformer so that if the AC > > power failed it would change from one call sign to another > > that had a trailing "/DC" at the end of the ID sequence > > 2) the switch on the rack door changed the ID to a > > trailing "/DO". > >There are "address tricks" to change the message when something >happens. Easy enough to do in Eprom, Prom and Diode Matrix ID >boards. Yep. My first exposure to a diode programmed IDer was the K2OAW article in the Feb 1973 issue of 73 magazine. As far as I know it was a totally unique design - 16 bits, no diode was a dah, a diode to one buss was a dit, to another buss was a space. I modified the design to add a trailing (space)(dit) to the end on a power failure. > > When you come right down to it, the GLB IDer was a good > > product 20-25 years ago, but a $20 ID-O-Matic kit that you > > can program with a computer serial port is a helluva lot less > > hassle these days (and it supports two messages - you can > > connect a 5vDC wall wart or a door open switch if you want to). > > See <http://www.hamgadgets.com/product_info.php?products_id=64> > > And there is no fancy software - hyperterminal will do. > >While I agree... I will also make a case for going through >the hassle of reprogramming the original unit if there's not a >lot of involved grief in getting it done. You will learn quite >a bit if you do even the most simple home-work. You learn more (and it sticks longer) by doing than by reading or listening. >The problem with many people not getting much in-depth experience >in electronics is because the cost of doing x-task is often >so much less with newer replacement electronics than the time >most people would consider putting into repairing or refurbishing >an older circuit. You lose valuable exposure and hands on >experience. Absolutely. I have learned more from making the effort of reverse engineering a design than from most books. As an example I learned more about real-time programming from a discarded listing of the Univac 1108 operating system kernel (a 6 inch high stack of line printer paper back in 1975) than I did in three classes. >In this case, reprogramming the Eprom using the resources of >the group members might actually be less than replacing the >unit. > >cheers, >s. > >ps: I'd like to have a diagram of the ID'er if it's available >anywhere. I called a friend that had one in a GE Progress line based repeater, and as far as I know it's still in the back of his garage. If the rack is still there, then the manual is in a 3-ring binder that is in the bottom of the rack. I'll know in a few days, and if it's there I'll borrow it. Mike WA6ILQ
