DDP-24

{{Short description|24-bit computer designed and built by Computer Control Company in 1963}} {{Infobox supercomputer | name = | image = | caption = | manufacturer = Computer Control Company | designer = | release date = 1963<ref name="1967survey">[http://ed-thelen.org/comp-hist/AdamsReport1967Q4-1968Q1.pdf Adams Report 1967, PDF]</ref> | units sold = 25+ (1964)<ref name="1964survey">[http://ed-thelen.org/comp-hist/BRL64-c.html#CCC-DDP-24 BRL REPORT NO. 1227 JANUARY 1964]</ref> | price = $87,000.00<ref name="1964survey"/> | dimensions = Length : {{convert|233|cm|in|abbr=on}}<br>Depth : {{convert|100|cm|in|abbr=on}}<br>Height : {{convert|155|cm|in|abbr=on}}<ref name="manual">[http://www.bitsavers.org/pdf/computerControlCompany/ddp-24/DDP-24_InstructionMan_Aug64.pdf DDP-24 Instruction Manual, August 64, PDF]</ref> | weight = {{convert|2000|lb}} <ref name="1964survey"/> | power = 2000 W | voltage = 115 V AC<ref name="manual"/> | front-end = | os = | cpu = 24-bit processor | frequency = 200 kHz (5 μs cycle)<ref name="1967survey"/> | memory = 98 kilobytes (32767 x 24 bit) | storage = | mips = 0.2 MIPS | flops = 100 000 FLOPS | successor = DDP-224 | predecessor = }} The '''DDP-24''' (1963<ref name="1967survey"/>) was a 24-bit computer designed and built by the Computer Control Company, aka 3C, located in Framingham, Massachusetts. In 1966, the company was sold to Honeywell who continued the DDP line into the 1970s.

==Hardware== The DDP-24 was completely transistorized and used magnetic-core memory to store data and program instructions. It had a sign magnitude code to represent positive or negative numbers and used binary logic. The DDP-24 used a single address command format and single operation with index and indirect addressing flags.

==Market acceptance== The DDP-24 found use in space and flight simulators of the mid-1960s and other real-time scientific data processing applications.

Peter B. Denes, a researcher at Bell Telephone Laboratories, Inc., installed a DDP-224 system around 1965 for use in speech research.<ref>Denes, Peter B., "Real-Time Speech Research," Proc. Symposium on the Human Use of Computing Machines, Bell Telephone Laboratories, June 1966, pp. 15-23.</ref> It and a DDP-24 were used by Max Mathews, considered by many to be the founding father of computer music, to develop his GROOVE music system, as related by Professor Barry Vercoe in a 1999 MIT Media Lab interview.<ref>[http://www.media.mit.edu/events/EMS/bv-interview.html 1999 MIT Media Lab interview with Professor Barry Vercoe]</ref> When asked to describe the first MIT experimental music studio, Prof. Vercoe replied, "We began that work when I first arrived in 1971. The first studio we had was in the basement of Building 26, where we had a computer given to MIT by Max Mathews--the Honeywell DDP-24. Max initially developed his GROOVE system on this machine and was kind enough to give it to MIT when I joined the faculty." The 3C DDP-24 used modules or cards called S-Pac's. These S-Pac cards could be Flip-Flops, NAND gates, Bit Registers etc. and were housed in a DDP-24 S-Bloc card rack.<ref>[http://www.p3oriontopsecret.com/3c-computer-control-company-ddp-24-card-rack.html 3C Computer Control Company DDP-24 Card Rack circa 1964]</ref> An early raster-scan graphics display was developed for the computer system.<ref>Noll, A. Michael, "Scanned-Display Computer Graphics," Communications of the ACM, Vol. 14, No. 3, (March 1971), pp. 145-150.</ref>

== External links & Bibliography == * [http://www.bitsavers.org/pdf/computerControlCompany/ddp-24/DDP-24_InstructionMan_Aug64.pdf DDP-24 Instruction Manual, August 64, PDF] * [http://ed-thelen.org/comp-hist/BRL64-c.html#CCC-DDP-24 BRL REPORT NO. 1227 JANUARY 1964] * [http://ed-thelen.org/comp-hist/AdamsReport1967Q4-1968Q1.pdf Adams Report 1967, PDF] * {{cite web|url=http://archive.computerhistory.org/resources/access/text/2012/06/102658256-05-01-acc.pdf|title=Oral History of John William (Bill) Poduska}}

==References== {{reflist}}

Category:Minicomputers Category:24-bit computers