This article is from the Amiga CD32 FAQ, by Stuart Tomlinson with numerous contributions by others.
A: Use a SX-1. This has... IBM-PC AT keyboard port. 9-pin serial port. Amiga standard parallel port. Amiga standard RGB port. Amiga standard floppy drive (use an external drive as DF0:. For more drives, daisy chain them from the first one). 2.5" internal IDE connector (drive fits inside the SX-1). 3.5" external IDE connector. SIMM socket for up to 8 meg additional RAM (restricted to 4 meg if you intend to use the FMV cartridge too). Audio input (karaoke). Internal battery backed clock. Pass through connector (for other devices, eg. FMV cartridge).
If you add the SX-1, the Aux port will not work as a serial connection any more, but you can still attach Amiga keyboards to it, even if you have a PC keyboard plugged into the SX-1.
Some external drives do not like the SX-1. Roctec and M3-A-1 drives are a problem.
If you use a file recovery program on the SX-1 disk, you'll get more utilities.
If you intend to have more than two devices attached to the SX-1, you should think about getting a better power supply. These can be bought separately, or you can modify another Amiga one (eg. A500) by replacing the connector at the end of the lead.
If you add extra memory to it, it should be at least 80ms fast.
A: Use a SX32. It's small so it fits *in* the CD32 like the MPEG module. You have a parrallel, serial, floppy, RGB and VGA-Port. You can put a 2.5'' HD on it and a 2-8 MB PS/2 Simm module. Unfortunatly FMV cannot be used with it. It is also rumoured to come with an A1200 manual. Apart from that it fixes the voltage problems it is more or less like the SX-1.
Alan Redhouse wrote: "Standard Amiga serial, parallel, FDD, RGB ports and a 15 pin VGA port. Uses standard Amiga K/b Has standard Simm socket for up to 8MB Has 2.5" HDD interface and mountings for an internal unit
Everything (inc HDD) fits inside the CD32 (sockets protrude about 10mm) Supplied with WB3.0 on CDROM (obviously has K/s 3.1 already)
VERY reliable - it must be the only Amiga accessory that we've picked up & plugged in and its worked perfectly first time and ever since.
It really does become a portable Amiga.
Price 199.95 inc VAT"
A: Use a CD32x. This is a 19" rack mounted system for CD32s used in professional applications. It includes remote monitoring of CD32x units, fault detection, and options for genlocking and MPEG. There are connectors available for... Networking. RGB port. Scart port. Floppy port. IDE connector. Volume control. Stereo input and output. Internal battery backed clock.
Mick Tinker of Index said that they're working on a home version of the CD32x. The release date depends on when Escom starts selling the CD32 again.