Anyone ever combo'd 2 Xmems and an Advantage ?

[Sylvain Cote]

I was intrigue, and I researched all the EduCALC catalog that I have (22 physical and/or PDF) and I did not find in any of them the quadruple conversion.
It's perfectly possible, that the person behind the module conversion at S.O.S. did quadruple conversion, but he certainly did not advertised it the EduCALC catalog.

From EduCalc Catalog 52S Summer 1991 P.5 (Last EduCALC catalog for the HP 41/71/IL products)

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Not Enough HP 41 Ports?  Combine two or three HP 41 modules into one!

Dual Modules: Combine a Quad Memory. Extended Memory or Time Module with each 
other or any normal Application Pac.

Triple Modules: Combine one Extended Functions and two Extended Memory Modules 
(this is the most common), or anyone normal Application Pac with two Extended 
Memory Modules (HP 41 CX).

HP IL Convenion: Your HP IL can be combined with either the HP IL Development, 
Extended IO or Plotter Module. 

All conversions are warranted by S.O.S. (not HP) for 1 year after conversion. 
Please allow 2 to 3 weeks. List any modules that you are enclosing for 
conversion on the order form and indicate that they are supplied by you. 
Price of service does not include modules.

Stock 531D [Double Module Conversion] ................................... $30.00 
Stock 531T [Triple Module Conversion] ................................... $55.00 
Stock 531L [HP IL Conversion] ........................................... $45.00