Reading through the various literature and commentary from yesteryear about the FT-980, it's mentioned that an Auxiliary band ROM was never offered for the rig - nor was any programming data provided...at least in the English version of the Technical Supplement.
The ROM is a bipolar type and a 74188/74288 appears to be a suitable replacement. There are others.
A gent by the name of Callan Brown offers something termed a "FLEP" - a daughterboard which allows the use of a QFP type EEPROM in place of a bipolar ROM. It was originally designed for the video game market. I bought a couple last year and when I source a couple of Harwin headers I'm going to have a go at developing a programming map for the ROM. 60M coverage will be high on the priority list...and since there are only FF combinations of data to try it shouldn't be that difficult to map all the HF ranges. Even if I have to try every value.
Before I start this effort: Is there anyone in the group with a '980 which actually had an Aux band ROM installed....either by Yaesu or by a 3rd party? I have four of the rigs at present plus a spare CPU Unit and none have the ROM present. Nor have a number of other 980s which I've examined. Alternatively, do we have access to the Japanese-language Technical Supplement (which may contain the ROM programming data)?
73 - Fred, N8YX
