--- Dan <[EMAIL PROTECTED]> wrote:
> Does any one have the proceedure for programming the
> GLB ID chips.. I
> believe its just a 2713. I have the programmer but
> need help with the
> code.
>
> Dave N3CNJ
>
The GLB ID'er used a 2716 eprom. The way it was
programmed was to start at address 0 and step up one
"bit" of the ID code at a time. The unit had 8 output
lines, but for simplicity it is easier to program all
of them the same.
A "0" in the programming produced a tone, a "1"
produced no tone. The addresses are stepped through at
a 10ms-100ms rate, depending on the code speed
desired.
You need to break the code desired down into dits,
dahs, and spaces, then program accordingly, leaving 2
blank bits at the beginning of the programming.
For example "SOS" would be "di di di dah dah dah
di di di" where each "di" would be one bit programmed
to 0, and each "dah" would be three consecutive bits
programmed to 0 (since a "dah" is three times longer
than a "di"). Spaces are programmed as a "1". Your
binary output, starting at memory add 0000 and
advancing one address each time, would look like:
1101010111000100010001110101011111111111111
Once you program your desired ID, the rest of the chip
gets filled with "1"s. This is the default state when
you erase a 2716, its all 1s.
Since the chip programs in hex, you will essentially
be writing "FF" or "00" in each address. Again,
writing "SOS" into the chip would look like this:
FF FF 00 FF 00 FF 00 FF FF FF 00 00 00 FF 00 00 00 FF
00 00 00 FF FF FF 00 FF 00 FF 00 FF FF FF FF
That is all you need to program, the rest of the bits
in the chip will stay at "FF", which is the erased
position.
If you want to program different things on the
different lines, it becomes more complex, but I think
you see the pattern here.
Joe
__________________________________
Start your day with Yahoo! - Make it your home page!
http://www.yahoo.com/r/hs
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
