Just a hint for all of you that are trying to figure out how to write your own software to calculate what to program into the EPROM... Check the programming for the actual PLL chip in the data book and write a small program to calculate the data required and compare it to known data in the PROM in the Syntrx.
Here is a conversion chart for using a EPROM in place of a PROM in the Syntrx:
EPROM PIN 01 TO PROM PIN 17 EPROM PIN 02 TO PROM PIN 01 EPROM PIN 03 TO PROM PIN 02 EPROM PIN 04 TO PROM PIN 03 EPROM PIN 05 TO PROM PIN 04 EPROM PIN 06 TO PROM PIN 07 EPROM PIN 07 TO PROM PIN 06 EPROM PIN 08 TO PROM PIN 05 EPROM PIN 09 TO PROM PIN 14 EPROM PIN 10 TO PROM PIN 13 EPROM PIN 11 TO PROM PIN 12 |->EPROM PIN 12 TO PROM PIN 20 | EPROM PIN 13 TO PROM PIN 11 L| EPROM PIN 14 TO N/C I| EPROM PIN 15 TO N/C N| EPROM PIN 16 TO N/C K| EPROM PIN 17 TO N/C E| EPROM PIN 18 TO PROM PIN 09 D| EPROM PIN 19 TO PROM PIN 08 |->EPROM PIN 20 TO PROM PIN 10 EPROM PIN 21 TO N/C EPROM PIN 22 TO PROM PIN 15 EPROM PIN 23 TO PROM PIN 16 EPROM PIN 24 TO PROM PIN 18
You can use either 2716 or 2732 EPROMS only with this mod. The pin-outs are different for a 2764 or higher, although you can do it, which allows up to 64 banks of channels.
The PROM's for the Syntrx can be very hard to get, so an adapter board has been designed which uses a 2764 EPROM. It works well but is time consuming to make. Please contact Brad for more information. He has also spent serveral hours converting the low band Syntrx to work on 6mtrs 52-54 mhz but has not finished the project due to lack of time. He still needs to work out the PA mods. So if you know of any one out there that has done this could you please let him know.
The Syntrx Compac is only a 2 channel version of the Syntrx this is programmed by a PROM and there is about 5 different versions of software for this radio also.
Some of the Syntrx's (the Plus's we believe) use RSS (AVN6021A, SYNPLUS.EXE) and a programming cable (AKN6224A) which has a MAX232 chip built in to the DB25 shell.
You can get all you want of the Syntrx PROM (20, 40 or 100 ch) and Syntrx PLUS EEPROM (depending on which you need) from firstname.lastname@example.org.
Another source for programming and PROMS is Black Box Systems.