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- Xref: sparky comp.arch:8380 alt.folklore.computers:11281 comp.benchmarks:1200
- Path: sparky!uunet!news.uiowa.edu!ns-mx!pyrite.cs.uiowa.edu
- From: jones@pyrite.cs.uiowa.edu (Douglas W. Jones,201H MLH,3193350740,3193382879)
- Newsgroups: comp.arch,alt.folklore.computers,comp.benchmarks
- Subject: Re: dinosaur horsepower
- Message-ID: <13307@ns-mx.uiowa.edu>
- Date: 28 Jul 92 14:48:02 GMT
- References: <Bs3oGt.6vp@helios.physics.utoronto.ca>
- Sender: news@ns-mx.uiowa.edu
- Followup-To: comp.arch
- Lines: 32
-
- From article <Bs3oGt.6vp@helios.physics.utoronto.ca>,
- by sysmark@helios.physics.utoronto.ca (Mark Bartelt):
- >
- > But, in general, I think it would be fun to see MIPS/MFlops (KIPS/KFlops?
- > IPS/Flops?) values (at least, moderately authoritative ballpark estimates)
- > for some of the machines we grew up with.
-
- The IBM 701, in 1953, had a fundamental machine cycle time of 12us. A
- memory to accumulator add took 5 cycles (60us) and a multiply took 38
- cycles. IBM claimed an average instruction execution rate of 14,000
- instructions per second. This machine had a 36 bit word.
-
- The 701 was a first generation machine (vacuum tubes, williams tube
- memory). The main memory could be expanded 2K words, and this memory was
- advertised as a high speed large capacity memory.
-
- The DEC PDP-8, in 1965, had a 1.5us memory cycle time, so it took 3 us to
- do a single 12 bit memory to accumulator add (1.5us for the instruction
- fetch and 1.5us for the operand fetch and add). You could say that this
- was a 1/3 MIP machine, but if you want any precision, you'll have to do an
- extended precision add. A memory to memory 24 bit add on this machine
- takes 7 instructions. A similar 36 bit add takes at least 11
- instructions.
-
- The PDP-8 was a second generation machine (transistorized, discrete
- components, core memory). The maximum memory capacity of the architecture
- was 32K 12 bit words. Although it was a small inexpensive system,
- by the standards of its day, the speed of the logic was very typical of
- the times.
-
- Doug Jones
- jones@cs.uiowa.edu
-