Editing IBM RT PC (section)

==Hardware==
Two basic types were produced: a floor-standing desk-side tower (IBM 6150), and a desktop (IBM 6151).<ref name="pcw198701_ibm6150">{{ cite magazine | url=https://www.worldradiohistory.com/UK/Personal-Computer-World/80s/PCW-1987-01-S-OCR.pdf | title=IBM 6150 | magazine=Personal Computer World | date=January 1987 | access-date=3 January 2024 | last1=Jackson | first1=Peter | pages=138-139,142-144 }}</ref> Both types featured a special board slot for the processor card, as well as machine-specific RAM cards. Each machine had one processor slot, one co-processor slot, and two RAM slots.

There were three versions of the processor card: 

* The '''Standard Processor Card''' or ''032 card'' had a 5.88{{nbsp}}[[MHz]] clock rate (170{{nbsp}}ns cycle time), 1{{nbsp}}[[Megabyte|MB]] of standard memory (expandable via 1, 2, or 4{{nbsp}}MB memory boards). It could be accompanied by an optional Floating-Point Accelerator (FPA) board, which contained a 10{{nbsp}}MHz [[National Semiconductor]] [[NS32000|NS32081]] [[floating point]] [[coprocessor]]. This processor card was used in the original RT PC models (010, 020, 025, and A25) announced on January 21, 1986.<ref>{{Cite web|url=https://www.ibm.com/docs/en/announcements/archive/ENUS186-006|title=IBM 6150 RT Personal Computer Models 020, 025, and A25 IBM 6151 RT Personal Computer Model 010|date=21 January 1986}}</ref><ref name=Sanger>{{cite magazine |last=Sager |first=Ira |date=27 January 1986 |title=IBM Retargets Tech Market with RISC-based UNIX System |magazine=[[Electronic News]]}}</ref>

* The '''Advanced Processor Card''' had a 10{{nbsp}}MHz clock (100{{nbsp}}ns) and either 4{{nbsp}}MB memory on the processor card, or external 4{{nbsp}}MB [[Error correction and detection|ECC]] memory cards, and featured a built-in 20{{nbsp}}MHz [[Motorola 68881]] floating-point processor. The Advanced Processor Card could be accompanied by an optional Advanced Floating-Point Accelerator (AFPA) board, which was based around the [[Analog Devices]] ADSP-3220 FP multiplier and ADSP-3221 FP ALU. Models 115, 125, and B25 used these cards. These models were announced on February 17, 1987.<ref>{{Cite web|url=https://www.ibm.com/docs/en/announcements/archive/ENUS187-021|title=IBM RT Personal Computer (RT PC) (TM) New Models and Additional Features|date=17 February 1987}}</ref>

* The '''Enhanced Advanced Processor Card''' sported a 12.5{{nbsp}}MHz clock (80{{nbsp}}ns), 16{{nbsp}}MB on-board memory, while an enhanced advanced floating point accelerator was standard. The models 130, 135, and B35 used these cards. They were announced on July 19, 1988.<ref>{{Cite web|url=https://www.ibm.com/docs/en/announcements/archive/ENUS188-120|title=IBM RT (TM) System New Models|date=19 July 1988}}</ref>

All RT PCs supported up to 16{{nbsp}}MB of memory. Early models were limited to 4{{nbsp}}MB of memory because of the capacity of the DRAM ICs used, later models could have up to 16{{nbsp}}MB. I/O was provided by eight [[ISA bus]] slots. Storage was provided by a 40 or 70{{nbsp}}MB hard drive, upgradeable to 300{{nbsp}}MB. External [[SCSI]] cabinets could be used to provide more storage. Also standard were a mouse and either a 720×512 or 1024×768 pixel-addressable display, and a 4{{nbsp}}Mbit/s [[Token Ring]] network adapter or [[10BASE2]] [[Ethernet]] adapter.

For running [[CADAM]], a [[computer-aided design]] (CAD) program, an IBM 5080 or 5085 graphics processor could be attached. The 5080 and 5085 were contained in a large cabinet that would have been positioned alongside the RT PC. The 5080 was used with a 1,024- by 1,024-pixel IBM 5081 display.<ref>{{cite magazine |last=Derfler, Jr. |first=Frank J. |title=Is There a Workstation in Your Future? |magazine=PC Magazine |volume=5 |issue=11 |date=10 June 1986 |pages=110{{ndash}}113, 115 |url=https://archive.org/details/PC-Mag-1986-06-10/page/n115/mode/2up}}</ref><ref>{{cite book |last1=Peddie |first1=Jon |title=The History of Visual Magic in Computers |date=2013 |publisher=Springer |pages=172{{ndash}}173 |url=https://link.springer.com/book/10.1007/978-1-4471-4932-3 |isbn=978-1-4471-4932-3 |doi=10.1007/978-1-4471-4932-3}}</ref>

===6152 Academic System===
{{Main|IBM Personal System/2#6152 Academic System}}
The 6152 Academic System was a [[IBM PS/2 Model 60|PS/2 Model 60]] with a RISC Adapter Card, a [[Micro Channel]] board containing a ROMP, its support ICs, and up to 8{{nbsp}}MB of memory. It allowed the PS/2 to run ROMP software compiled for the AOS. AOS was downloaded from a RT PC running AOS, via a [[LAN]] [[TCP/IP]] interface.