60 uses 144-pin 5V 60ns DIMM memory modules of either 32, 64, or 128 MB which should be installed in sets of four identical DIMMs. There are 16 DIMM sockets, so it is possible to fit up to 2 GB with sixteen 128 MB modules. The memory bus is 576-bits wide; 512 bits are used for data and 64 bits for error correction. The specifications give the maximum throughput of 1.78 GB/s. Performance is improved if 2-way interleaving is used (giving 512 MB or 2 GB). Internal storage The Ultra 60 takes one or two 1" high SCA SCSI disk drives internally. It was sold with 18.2 GB or 36.4 GB disks, but can in practice use any SCA disk. The internal disks must be mounted in a carrier or spud-bracket (Sun part number 540-3024). The SCSI IDs of the internal disks are 0 and 3. These are set by the SCA backplane and can not be changed. An optional 1.44 MB 3.5" MS-DOS/IBM compatible floppy drive can be fitted. An optional 644 MB SunCD 32X-speed, Photo CD compatible CD-ROM drive or an optional 10X DVD-ROM could be specified as well. Many Ultra 60s in current use will be fitted with a rewritable CD-ROM drive. PCI and UPA slots http://www.sunshack.org/data/sh/2.1.8/infoserver.central/data/syshbk/Systems/U60/spec.html PCI Four full-size PCI slots compliant with PCI specification version 2.1: Three slots operating at 33 MHz, 32- or 64-bit data bus width, 5 volt One slot operating at 33 or 66 MHz, 32- or 64-bit data bus width, 3.3 volt Some systems might be inoperable if a PCI 2.2 card is installed. Video Card: Framebuffer / UPA There are #2 UPA graphics slots running at 112 MHz supporting one Elite3D m3 and/or Elite3D m6 graphics options, or up to two Creator3D graphics options. The XVR-1000 graphics option is not officially supported but does work, under Solaris 9 or Solaris 10. SCSI The Sun Ultra 60 is fitted with a dual channel Ultra-3 SCSI controller. The speed is 40 MB/s. One controller (c0) is used for the internal disk(s) and CD-ROM, DVD-ROM and tape. The second channel (c1) is used for the external 68-pin Ultra wide SCSI connector on the rear of the Ultra 60. Input and Output connectors Two RS-232C/RS-423 serial ports using DB-25 connectors A 2 MB/s Centronics-compatible parallel port using a DB-25 connector Standard mini DIN-8 connector for Sun keyboard / Sun mouse External Ultra Wide SCSI