64 pin SIMM (Mac IIFX) Specs?

I am looking for specifications for the 64 pin SIMMs used in the Macintosh IIFX and one or two of the LaserWriters (IINT, IINTX?). I have the pinout from the "Guide to the Macintosh Family Hardware" but could use the physical dimensions, i.e. an engineering drawing. Any special electronic considerations would be nice to know too. I'm thinking about running off a few homebrew boards. One of Apple's old Tech Notes states, "The IIfx has 64-pin SIMMs, which are different from previous Macintosh models. Developers can request mechanical drawings and electrical specifications of the IIfx RAM SIMM modules from DTS. Please send the request with a mailing address and include the words "IIfx SIMM information request" in the title of the electronic mail request or letter to facilitate handling." But since that note was last updated in 1991, I'm guessing that wouldn't work any more. But if one of you sent off for that information way back when, I would love to see it. My main concern is that the pinout lists a separate data pin for data in and data out. So even though they are eight bit SIMMs, there is a Data In [0:7] and Data Out [0:7] in the pin out. It's possible, perhaps likely, that these are simply tied together, but it would be nice to see some confirmation. The chips I've identified on IIfx SIMMs don't appear to be dual ported and I don't see any extra circuitry on the SIMM that could be making an adaptation, but I'm working from JPEGs so far. If this looks feasible I'll actually spring for a IIfx and a few SIMMs to work from. On the other hand, if the SIMMs require some rare dual data ported DRAM chips, then I'll drop the idea. Jeff Walther