What cards are suitable for the Newton?
You can use SRAM cards or FlashRAM cards. SRAM cards are more expensive than FlashRAM cards, and they need an internal battery. There are several kinds of flash memory cards available today and in many different phisical formats. There are ATA flash cards, compact flash cards, SmartMedia flash cards, memory sticks and linear flash cards. There are Linear and ATA cards that can look the same externally, but only linear (or regular) cards can be used in Newton MessagePads natively, and not all. (see next question). For ATA cards, you need to use a software developed by Paul Guyot. More details available at: http://www.kallisys.com/newton/ata/?
