Looking at the schematics for the Wideband Source (the only document I have so far for it), the schematic page for installing it it says you need to replace the main ROM in the 4808 digital board and you also need to modify the keyboard (I think mine has been done).
The ROMs on my digital board are labelled:
400837-3.0 14 Feb 92
401007-2.10 06/06/94
401006/1.0 016007
which I think implies overall revision 1.4/ECO 4500 and I think they do support Opt. 70, but I'm not sure as I get Error 9 when I press the WBV button (this could be a fault with my Opt. 70 unit).
Does anyone know what the highest ROM levels available are? The schematic page for installing Opt. 70 refers to a revision level 1.8 but this may not be the highest.
More worryingly I got an email offline which said:
Every wideband option 70 unit that I have serviced includes an additional board as well as the firmware and the mod to the keyboard to add the WB button. It is added to the main box at the back on the center metal plate holding the mains transformer. It is installed electrically between the motherboard and the analog connector for option 60/70. The board includes a relay that disconnects the PHI and IHI signals and what appears to be diode clamp protection, though I have not taken the time to look closely at the rest of the circuit.
Does anyone know anything about that?
Oh yes, I anyone has any documentation apart from the schematics, I really want to hear from you.
Cheers
Dave