About HP F1237-60021

The only information I can find on the web about F1237-60021 is it is a memory expansion module for the HP 3xx palm tops. Can anyone provide more information here? Is it a RAM (how many MB) or ROM upgrade? Which model does it fit (300lx, 320lx, 360lx)?

Saw these two pics on ebay:







Attachments
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s-l1600-1.jpg (142KB - 1 downloads)
s-l1600-2.jpg (129KB - 1 downloads)

It takes the 320LX from CE 1.00 to CE 2.00 by ROM replacement. The 300LX doesn't have the slot and the 340LX/360LX are already CE 2.0.

Thanks for the critical information! I have just bought a used 320lx and one of this expansion board. . My adventure of monochrome CE devices is about to begin.

Subjectively, I think that photo is the CE 1 ROM board. If you look at my incredibly old, incredibly small photo of the 320LX's 2.0 board, you'll note the bridged chip design
https://www.hpcfactor.com/hardware/rom/ce20/

Thanks, C:Amie again. I attached the image of the genuine expansion board to the seller and told him the listed item was likely to be a swapped component from the machine instead of the expansion module itself. The seller also compared the details of the listed item and the box and found they didn't match. Refund was then processed right away.
I just want to experience the LX series and didn't fancy putting it on steroid by paying a premium for a double speed plus 32/64/96MB RAM upgrade.