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that is pretty ingenious
Thanks. Currently working on making a similar thing for Sony memory stick. :)
This has got me wondering if almost the exact same thing could be done for the (seldom used) Atari ST cartridge slot:

https://allpinouts.org/pinouts/connectors/cartridges_expansi...

Has 2 chip select lines. Hm.

Yes. Easily.
Biggest problem I think is that I believe the cartridge port connectors are un-obtanium from parts suppliers these days.
Had the same problem here. I suspect the ones I bought may be the last in the world
When I look at these card edge connectors, they don't seem like there's all that much to them, you'd think somebody would be able to make them to spec :-(
what a beautiful bit of computer engineering!
The entire Palm ecosystem was/is pretty awesome. I wish very strongly that it would have endured.
you can probably emulate it on current hardware, though the palmos programming sites are bitrotting

i wonder why it didn't endure? multitouch? inadequate 68k performance? malware?

I'd guess they didn't market it well enough

A palm pilot could do most of what people love iPhones for, but the only people who used them were business freaks and super-nerds

My Palm V was grayscale, did not have any wireless outside of some useless IrDa, no audio (music) or video of any kind, no camera, and no web browser.
My Samsung SPH-I300 had color and audio and internet and browser and basically an app for anything you could imagine just like android or ios today (better, since there was no Apple or Google preventing anyone from making any app they want, or preventing you from installing it), in 2000 or 2001, 7 years before the iphone or android.

Without a keyboard or numpad just a full front face color touch screen, it was a prototype modern style phone. I had email, audible.com app, ebook readers, ssh and irc clients, even a vnc client. Vnc & rdp were ractically useless on 14.4k dialup equivalent and 160x240, but it actually physically worked. I had a couple different contacts db to dialer integration apps. Then just the infinite random apps like a netmask calculator, resistor color code calculator, etc. The contacts db had my works entire customer & vendor dbs on the phone while off line by using a simple csv export and the palm desktop synced it to the phone. Full size sd card slot.

It was freaking great. in 2001. iphone and android are 2007

That's awesome! I was trying to figure out.. what port/connection would you hook up a similar device to a 68k computer like a Mac or Amiga or such? This would be a pretty awesome super-affordable alternative to a BlueSCSI[0] or the like, maybe? Or is that overly optimistic of me to think? haha

[0] https://bluescsi.com/v2

Sure, but it'd be relatively slow. Sloooow.
The hardware's the easy part - then you have to write a device driver for one of these systems
That's not very hard, they are documented to death and back.
In 1985 (or so) I got a “WARP 20” internal SCSI hard drive for my original Mac 512k.

Of course there are no internal expansion connectors at all on an original Mac. Steve didn’t want the purity of the hermetically sealed machine to be sullied.

This thing came with a custom-made tool to get the case open (a long-shafted Torx driver with a flat paddle welded to it to pry the case apart). Once there, you removed the ROM chips, placed them in a little daughterboard, and inserted that into the ROM sockets. That’s how they got access to the CPU bus. There was a SCSI controller and some address decoding on the board that attached to the drive over a ribbon cable.

They wrote a custom driver to talk to the controller, and even gave out the source code. Fortunately Apple had just released the first version of HFS for the 800k floppy disks, so to the OS this looked like a giant (20MB) floppy.

Nice timing.. I just got MMC support working in my u-boot port for the mc68ez328 to load Linux :D