Hello Argus,
You have to be careful as I once bought a PCMCIA Mode 2 card and it
didn't fit.
There is PCMCIA 1 (A600/A1200), PCMCIA 2 and PCMCIA 3.
The Mitsubishi 'Melcard' seems to work. It is a 2Mb SRAM card (memory
or disk use) and has a battery to keep disk data saved upon power
down.
The part number is: MF32M1-LCDAT01 -Mitsubishi Electric.
There has to be more but 2Mb seems to be the largest PCMCIA-1 SRAM
card I can find.
If you want to try another alternative you could make a SCSI flash
card reader. There's tips on Aminet for PCMCIA-SCSI stuff.
http://de.aminet.net/aminetbin/find?scsi_pcmcia