personal computer by Apple

Apple replaced the Mac 512K with a model supporting double-sided 3.5″ disks, just like the Mac Plus . Unlike the Plus, the 512Ke used RAM chips rather than SIMMs, just like the 128K and 512K. This precluded upgrading RAM beyond 512 KB by simply plugging in higher capacity chips, although some companies did make memory upgrade kits for the 512Ke.

The 512Ke and Mac Plus were the last Macs not to use ADB ports for the keyboard and mouse – and the first to use mini DIN-8 serial ports.

Except for the name on the front, the 512Ke looks just like the Mac Plus pictured here. The biggest differences were the amount and type of RAM and the lack of a SCSI port on the 512Ke.

Specs (via Low End Mac)

• Cpu: 8 MHz 68000
• Ram: 512 KB, expandable to 2 MB with party upgrades
• Rom: 128 KB
• Floppy Drive: 800KB double-sided
• Addressing: 24-bit only
• Gestalt Id: 3
• Code Name: Mac Minus
• Upgrade Path: Plus
• Pram Battery: 4.5V PX 21 (a.k.a. Eveready 523, ANSI 1306AP, IEC 5LR50)
• Weight: 16.5 lb.
• Serial Ports: DB-9 modem and printer ports
• Power Supply: 60W
• See: Online Resources – Mac 512Ke