- An internal drive bay for a hard disk or a second floppy disk
- An expansion slot
- Standard SCSI connector and faster data throughput
- Cooling fan (prior models had no fan)
- Additional fonts and kerning in ROM
- Speed improvement when accessing RAM
THe Macintosh SE came with 1MByte of RAM, expandable to 4MByte. The processor was still the 68000 running at 8MHz. Graphics was 512x342 monochrome, which used 21888 bytes of main memory as video ram.
The expansion slot on the SE allwos for cards such as a MicroMac accelerator, which upgrades the SE to 50MHz. Putting an expansion card in the slot meant opening the case, which exposed the user to the high voltage that is present on a CRT, even when turned off, and Apple recommended that expansion was done by a qualified technician.