Introduction Date: October 18, 1993
Discontinued Date: April 1, 1996
Original Mac OS: 7.1P
Supported Mac OS: 7.1P-7.5.1, 7.5.3-7.6.1
Apple Order/Model: M2147LL/A*
Model Family: M1640
Processor Speed: 33 MHz
Processor Type: 68030
Standard RAM: 5 MB
Maximum RAM: 36 MB
Processor Upgrade: Third-Party*
FPU: 68882 (Optional)
System Bus Speed: 33 MHz
Cache Bus Speed: N/A
ROM Type: Macintosh ROM
ROM Size: 1 MB
L1 Cache: 0.5k
L2 Cache: N/A
RAM Type: 72-pin SIMM
Min. RAM Speed: 80 ns
Motherboard RAM: 4 MB
RAM Slots: 1
Video Card: Dedicated*
VRAM Type: VRAM SIMM*
Standard VRAM: 512k*
Maximum VRAM: 768k*
Display Support: 14" Color
Resolution Support: 640x480
2nd Display Support: Single Display*
2nd Max. Resolution: Variable*
Standard Hard Drive: 160 MB
Int. HD Interface: SCSI
Standard Optical: 2X CD-ROM

Standard Disk: 1.44 MB (Auto)
Standard Modem: None
Standard Ethernet: None
Expansion Slots: 1 LC PDS
Expansion Bays: None
Case Type: All-in-One
Form Factor: Macintosh LC 520
Apple Subfamily: Mac Performa 550
Gestalt ID: 80
Battery Type: 3.6V Lithium
Battery Life: N/A
Dimensions: 17.9 x 13.5 x 16.5
Avg. Weight: 40.5 lbs (18.4 kg)
Original Price (US): US$2000
Est. Current Retail: N/A
Video (Monitor): None
Floppy (Ext.): None
ADB: 2
SCSI: 1 (DB-25)
Serial (Standard): 2
Serial (Geoport): None
Modem: None
Ethernet: None
S-Video Input: None
S-Video Output: None
Microphone: 1 (PlainTalk)
Sound In: None
Sound Out: 1 (8-Bit Stereo)
Headphone: 1 (Front-Mounted)
Security (Lock): 1
Joystick (PC): None
Power: 1
Power Adapter: N/A