Editing Apollo/Domain (section)

==Models==
The model naming convention is DN (for Domain Node) with a model number.  If the system has no display, it is a DSP (for Domain Service Processor).

The first model is the DN416 workstation, later referred to as the DN100 after the green screen was substituted with a black and white screen.  This system uses two 68000 processors and implements virtual memory (which the 68000 is not theoretically capable of) by stopping one processor when there is a page fault and having the other processor handle the fault, then release the primary processor when the page fault was handled.

Later models have [[Motorola 68010|68010]], [[Motorola 68020|68020]], [[Motorola 68030|68030]], and [[Motorola 68040|68040]] processors which have native support for virtual memory.  Some workstations have bit-slice CPU implementations that are instruction set compatible with the 68000.

The DSP90 is a fileserver built using a standard [[Multibus]] backplane and I/O controllers.  The disk controller supports up to four 500MB hard drives.  A 9-track tape controller was released.

Early performance models are the DN560 and DN660 which are housed in desk-side cabinets.  These can have color graphics cards with graphics accelerators.

[[File:Dn330.jpg|right|frame|Apollo DN330 at Chelmsford, {{circa|1985}}]]
The DN300 and later DN330 are integrated desktop systems not much bigger than the included monitor.

In the late 1980s, Apollo introduced a new pair of machines, the DN3000 and DN4000 with 68020 processors,<ref>{{cite web|url=https://web-docs.gsi.de/~kraemer/COLLECTION/www.hunkler.com/aegis/aegis_sg.html|title=Survival Guide for Apollo Workstations|author=Tim Hunkler|date=July 1996|access-date=October 13, 2022}}</ref> but are housed in IBM PC style cases of the time with IBM-AT compatible ISA expansion slots and PC-compatible disk drives.  These became the mainstay of the Apollo range in the mid to late 1980s.  In principle, a user or third party can install a standard AT expansion card, but since this requires writing a special device driver, in practice this is very rare. However, the size and design of the boxes make installing or replacing components very easy. A typical system can have between 2&nbsp;[[mebibyte|MiB]] and 32&nbsp;MiB of memory, a 76&nbsp;MB, 150&nbsp;MB or 330&nbsp;MB (very occasionally 660&nbsp;MB) [[hard disk]], and 32-bit [[Motorola 68020|68020]] or [[Motorola 68030|68030]] processor running at 12&nbsp;MHz to 33&nbsp;MHz, depending on model. A half-height expansion bay could take either a 5¼-inch [[floppy disk]] drive or a [[Quarter-inch cartridge|QIC]]-type cartridge tape drive, capacity 30&nbsp;MB, 45&nbsp;MB, or 60&nbsp;MB depending on cartridge. For printer access, the system came with a [[serial port]] as standard; a serial/parallel expansion card can provide a parallel printer port.

The DN3000 and DN4000 were later upgraded to DN3500 and DN4500 with a faster [[Motorola 68030|68030]] CPU.<ref name="hpprofessional19891010_apollo">{{ cite magazine | url=https://archive.org/details/HP-Professional_Vol._03_No._10_Oct_1989/page/22/mode/1up | title=Apollo Introduces Desktop Graphics Workstations | magazine=HP Professional | date=October 1989 | access-date=March 4, 2024 | volume=3 | issue=10 | pages=22 }}</ref> The DN3500 is approximately as powerful as the DN4000.  A DN5500 with a [[Motorola 68040|68040]] was also produced in limited quantities.

The DN10000 series used [[Apollo PRISM]] processors.

Soon after HP acquired Apollo, the base DN2500 workstation was released at {{US$|3900|long=no}}, advertised as "4 Mips, 4 MB of memory, for under $4,000". It features a single integrated motherboard using PC standard DRAM single in-line memory modules, as a significant departure from previous models from the competition still using custom memory modules. The motherboard incorporates a SCSI disk controller for an optional hard disk drive<ref name="VisualMagic">{{cite book | title=The History of Visual Magic in Computers: How Beautiful Images are Made in CAD, 3D, VR and AR | first=Jon | last=Peddie | date=June 13, 2013 | isbn=9781447149323 | publisher=Springer London | url={{google books | id=6a8_AAAAQBAJ | page=166 | plainurl=yes}} | access-date=April 28, 2024}}</ref> and a single AT expansion slot dedicated for the use of a network card to allow the system to attach to any of the three supported networks: Apollo Token Ring, IBM Token Ring, or Ethernet. Monochrome displays of up to {{nowrap|1280 x 1024}} are supported,{{citation needed|date=April 2024}} and the base configuration has a {{nowrap|1024 x 800}} display.<ref name="VisualMagic"/> Based on the 68030 with 68882 [[floating-point unit]] running at 20&nbsp;MHz, with 4 to 16&nbsp;MB of RAM, the machine's list price of just under {{US$|4000|long=no}} reportedly represented "a major change in the price/performance ratio" for workstations. Educational institutions could purchase the base configuration starting at {{US$|2500|long=no}}.<ref name="byte199001_apollo">{{ cite magazine | url=https://archive.org/details/eu_BYTE-1990-01_OCR/page/n165/mode/2up | title=Apollo Shrinks the Workstation Price Tag | magazine=Byte | last1=Smith | first1=Ben | date=January 1990 | access-date=April 29, 2024 | pages=94–95 }}</ref>

A merged line of workstations that runs either Domain/OS or HP-UX, was produced with the name HP/Apollo 425t and HP/Apollo 433s. The 425t is a "pizza box" design with a single network expansion slot. The 433s is a desk-side server systems with multiple expansion slots.