Sun-1 was the first generation of UNIX computer workstations and servers produced by Sun Microsystems, launched in May 1982.

These were based on a CPU board designed by Andy Bechtolsheim while he was a graduate student at Stanford University and funded by DARPA.

Affixed to the case of early Sun-1 workstations and servers is a red bas relief emblem with the word SUN spelled using only symbols shaped like the letter U.

It combined a 10 MHz Motorola 68000 microprocessor, a Sun-designed memory management unit (MMU), 256 KB of zero wait state memory with parity, up to 32 KB of EPROM memory, two serial ports, a 16-bit parallel port and an Intel Multibus (IEEE 796 bus) interface in a single 12-inch-wide (300 mm), 6.75-inch-deep (171 mm) Multibus form factor.

By using the Motorola 68000 processor tightly coupled with the Sun-1 MMU, the Sun 68000 CPU board was able to support a multi-tasking operating system such as UNIX.

It was an asynchronous bus that accommodated devices with various transfer rates while maintaining maximum throughput.

The Sun CPU board fully supported multi-master functionality that allowed it to share the Multibus with other DMA devices.

The memory-mapped, bit-mapped frame buffer (graphics) board had a resolution of 1024 × 1024 pixels, but only 1024 × 800 was displayed on the monitor.

[5][6][7][8] Sun-1 systems upgraded with Sun-2 Multibus CPU boards were identified with a U suffix to their model number.