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Aliases  
Date  
CPUs 1
Clock speed 15.7 MHz
Processor Motorola 68020
Co-processor Motorola 68881
MMU Sun-3,   8 hardware contexts
Motherboard 501-1075,   501-1133,   501-1162,   501-1207
On-chip cache  
External cache  
Memory 4 MB,   256 MB virtual
Uses 270ns memory.
third-party memory expansion boards were sold, allowing up to at least 12 MB.
Speed 1.5 MIPS
Chassis type wide pizzabox
On older machines, the monitor is not separated from the chassis.
Bus none
Ports (1) SCSI.
(1) AUI or BNC ethernet (switchable).
(2) serial ports.
(1) ECL graphics.
(1) keyboard and mouse.
Internal storage  
Graphics Cycle-stealing monochrome frame buffer (1152 x 900).
Graphics memory is mapped into the main memory.
Power supply  
Architecture sun3
OS's supported First supported in SunOS 3.0.
Last supported in SunOS 4.1.1U1.
Notes Code-named "Model 25".
No bus or P4 connector.
68881 installed on 501-1207, empty socket for 501-1075 501-1133 501-1162.
Comments  
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