Supported System Software: 7.5.2, 7.5.3
SCSI: HDI-30
Serial Ports: 1
Sound Output: stereo 16 bit.
ADB: 1
Ethernet: none, see below
Machine Gestalt ID: 310

Minutiae:

Can be bumped to 200MHz with the Newer Technology NUpowr “CPU+Cache” replacement upgrade.  In addition to the speed increase, NUpowr adds 128 KB of level 2 cache.

Supports Ethernet with the Newer Technology "EtherTech PB10" card.  It is an internal 10BaseT card.

Supports Ethernet with the Newer Technology "EtherTech P10" card.  It is a PC Card (formerly PCMCIA) 10BaseT card.

Supports an external micro-modem with the Newer Technology "LinkCom 336" modem.  It is the industry's smallest modem. It fits into the palm of your hand and receives power from the ADB Port, or from an option AC adaptor.

Supports a psuedo internal modem with the Newer Technology "288 Cellular/Fax/Modem" card.  It is a PC Card (formerly PCMCIA) designed to support standard telephone lines as well as 45 different cellular phones.

The PowerBook 1400c/133 comes with 8 MB soldered on the motherboard, and either 4 MB or 8 MB installed in an “Apple only”  memory slot.  A “third party”  memory expansion slot allows piggy-backing of up to two additional memory cards.

Has expansion bay for a floppy disk drive, CD-ROM drive, 2nd hard disk, magneto-optical drive, Zip drive, or battery storage.

Serial Port with the phone icon supports synchronous modems, with handshaking on both the output and input.

Built-in speaker and integrated microphone.

Has security slot for locking (requires 3rd party cable).