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HP 8904A Options

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primetechie:
I have an 8904a with Option 2 installed but following the process in this thread I cannot add options 1 or 3. 
Option5 always adds but options 1 and  3 never do. 
Is there another address that needs to be modded in order to have this work on some firmware?  I am showing Firmware 152888A on mine.
Placing 07 at EFFC gives me options 2/ / /5; while placing FF gives me the same but with more empty slashes to the right
Any suggestions would be gratefully appreciated. 

Thanks   :)

TheDefpom:
I believe option 1 is a hardware option, and without it you also won’t get option 3.

srb1954:

--- Quote from: max666 on June 08, 2014, 02:29:15 pm ---Just out of curiosity; you did check if the voltage select switch is in the 230 V position, right?

Options:
001    Adds three more identical internal synthesizers (channels) which either can modulate the first synthesizer or be summed to the output
002    Adds second internal synthesizer and output
003    Adds fast hop and digital modulation
004    Connectors on rear panel only (not available with Option 005 or 006)
005    Adds unit to unit phase synchronization
006    Changes output 1 from a 50 Ohm output to a transformer-coupled, 600 Ohm balanced output
61024    Rack-mount Kit for a single HP 8904A
61025    Rack-mount Kit for mounting two 8904A's side by side

pretty sure those options require hardware changes, does the 8904A have software options?   :-//

--- End quote ---
I think options 001 and 003 were software enabled. Options 002, 004, 005 and 006 require hardware modifications.

primetechie:
Scott - you may be right.  I found another one with option 1 installed and was able to add 3 and 5 to it. So it seems that Option1 may in fact be a hardware option and without it. you cannot add 3.  If you have the HO8 option that either IS Option5 or allows it to be added.
The 8904A I was 'complaining" about has options 2 and HO8 installed and has a faulty ROM <AHAH!> that does not keep settings after a power cycle - so that may need to be addressed.  123 (Battery is good and tested and feeding a 3V 25ma current from a PS to the battery points doesn't fix the issue - so the current is there )  I'm hacking my way through this without damaging the units.  New ROM chips may be in order.
Not overly familiar with these (yet!) so any advice will be listened to. 
           Except moving to OZ  ;D- I'm already sold but my owner is less enthralled.   :box: :-DD

yyudin:

--- Quote from: TheDefpom on May 10, 2022, 11:25:58 pm ---I believe option 1 is a hardware option, and without it you also won’t get option 3.

--- End quote ---
I have an 8904A that came with only Option 2 factory-enabled.  By entering the value of "07" I was able to enable Options 1 and 3  :-+.  So this is definitely feasible!

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