The major differences between the Centris models are:
Feature: Centris 610: Centris 650: Centris 660AV:
-------- ------------ ------------ --------------
Processor MC68040 @20 MHz MC68040 @25 MHz MC68040 @25 MHz
DRAM Expansion 4 MB to 68 MB 4 MB to 132 MB 8 MB to 68 MB
DRAM Slots 2 slots 4 slots 2 slots
DRAM Speed 80 ns(nanoseconds) 80 ns 70 ns
DRAM SIMM Sizes# 4,8,16 & 32 MB 4,8,16 & 32 MB 4,8,16 & 32 MB
DRAM SIMM Type 72-pin 72-pin 72-pin
Ethernet Optional Optional Standard
FPU None Optional Standard
ROM Size 1 MB 1 MB 2 MB
Maximum VRAM 1 MB (512K stnd) 1 MB (512K stnd) 1 MB (I MB stnd)
VRAM Slots 1 slot 1 slot 1 slot
VRAM Speed 80 ns(nanoseconds) 80 ns 80 ns
NuBus Slots 1! 3 1*
PDS Slot% Yes Yes Yes
Notes:
# Composite SIMMs are not supported.
! With optional Centris 610 NuBus Adapter Card installed.
* With optional Centris 660AV NuBus Adapter Card installed.
% On the Centris 610 and 660AV models, the PDS Slot is the Expansion
Slot - it can either be used as PDS slot or as a NuBus slot with the appropriate NuBus Adapter Card installed.
The Macintosh Centris 610 and 660AV share the same type of enclosure (form factor) which is a flat, rectangular "pizza" box. The Macintosh Centris 650 uses a Macintosh IIvx style desktop box.
Additionally, the Macintosh Centris 660AV boasts a number of additional features not found in the Centris 610 & 650 including:
* An on-board DSP (Digital Signal Processor) Chip
* GeoPort Communications Architecture
* Composite and S-Video input and output ports
* Sound input and output ports