与Mac II(1987年3月)同时发布的Mac SE进一步解决了扩展问题。它出现在一个新的白金盒子里，有一个扩展槽，里面有一个海湾，要么是第二个内部软驱，要么是内部硬盘。Mac SE也是第一个包括苹果桌面总线(ADB)的Mac电脑，它允许最多16个输入设备。

Macintosh SE

CPU

Data Path: 16 bit

ROM: 256 kB

RAM Type: 30 pin SIMM

Minimum RAM Speed: 150 ns

Onboard RAM: 0 MB

RAM slots: 4

Maximum RAM: 4 MB

Expansion Slots: 1 SE PDS

Video

Monitor: 9″ built-in

Max Resolution: 1 bit 512x342

Storage

Hard Drive: optional 40 MB

Floppy Drive: 1 or 2 800 kB 3.25″

Input/Output

ADB: 2

Serial: 2

SCSI: DB-25

Audio Out: mono 8 bit mini

Speaker: mono

Miscellaneous

Codename: Mac ±, PlusPlus, Aladdin, Freeport, Maui, Chablis

Gestalt ID: 5

Power: 100 Watts

Weight: 17 lbs.

Minimum OS: System 3.0/Finder 5.1

Maximum OS: 7.5.5

Introduced: March 1987

Terminated: August 1989

Released at the same time as the Mac II, (March, 1987) the Mac SE further addressed the issue of expansion. It came in a new platinum case, had an expansion slot, and included a bay for either a second internal floppy drive, or an internal hard drive. The Mac SE was also one of the first Macs to include an Apple Desktop Bus (ADB), which allowed for up to 16 input devices. It sold for $2,898 for a dual floppy configuration. In August 1989, The SE was replaced by the SE FDHD. Thanks to Eric Rasmussen For OS info.