jecel

19 ms·

211.
by jecel 4y ago
The original description of the method finder was by Ted Kaehler in the July 2001 issue of SqueakNews. That electronic magazine was implemented in Squeak, but can now run in your browser thanks to the SqueakJS virtual machine: https:/
212.
by jecel 4y ago
The Oberon book describes the compiler, operating system, windowing system and other things. http://www.projectoberon.com/
213.
by jecel 4y ago
Just adding processing steps requires more masks. Moving from visible light to smaller wavelengths requires more and more sophisticated materials for the masks with smaller and smaller imperfections. To push a technology like DUV (deep ultr
214.
by jecel 4y ago
They didn't do it in a smart way. Part of the Self group joined forces with some other researchers to create a company called Animorphic which would build the world's "fastest Smalltalk" using the Self technology. It was
215.
by jecel 4y ago
I only watched this from the outside, but my impression was that it was an overreaction. Sun had a nice research operating system based on Java called SpringOS, but when clients heard about that they revolted. The transition from SunOS to S
216.
by jecel 4y ago
Here is a 1978 paper "Compilation and delayed evaluation in APL": https://dl.acm.org/doi/abs/10.1145/512760.512761 In the citations there is a 1970 paper "An APL Machine" which had some te
217.
by jecel 5y ago
One alternative is LCC: https://en.wikipedia.org/wiki/LCC_(compiler) It is half way in complexity between TCC and GCC or LLVM and was created to be educational. I think there are major differences between more recent v
218.
by jecel 5y ago
In terms of architectural style RISC-V is more similar to MIPS (via DLX) than to RISC-I, II, SOAR and SPUR (and Sparc).
219.
by jecel 5y ago
Pete Foley worked on something similar while at Apple. See "Other Projects" at https://web.archive.org/web/20190102164746/http://www.byrdsi... and the picture "Turbo 6502" in the slid
220.
by jecel 5y ago
In 1985 I was hired by a company in Brazil to decompile QNX to commented C sources. Softec launched the first PC XT clone in Brazil in May 1983 but it was initially absurdly expensive ($15K for a configuration that was $5K in the US) so the
221.
by jecel 5y ago
You are right about how much harder higher clocks made things. PC mother boards got stuck at 33MHz for the longest time even though 50MHz processors were available. It took Intel coming out with the 486DX2 (50MHz inside the chip, 25MHz on t
222.
by jecel 5y ago
> Or, said another way, it was a teletype terminal which happened to have its own computer inside to talk to. That is exactly what happened. A friend showed Woz how to access the Arpanet so he decided to build his own terminal. That was
223.
by jecel 5y ago
Among the issues that Cerebras had to overcome was how to connect tiles on a wafer where each tile has to be smaller than a reticle. In normal chips you have a gap on all sides where the diamond saw will cut the wafer into individual dies.
224.
by jecel 5y ago
The term "Brazil's cost" is about the legal overheads, which are much higher than anything due to corruption (which does, indeed, increase the cost of doing business). The largest component is cascading taxes. There are some
225.
by jecel 5y ago
Since the chip is meant for inference but not for training, in theory you only write to the Flash once or twice. In this case data retention is a more limiting factor than wear. For digital storage the data can change quite a bit before a 1
226.
by jecel 5y ago
I only know a little about the Long Now Foundation so I could be getting it wrong, but I understood their goal was to help people think about problems beyond the short term. For example, why would anyone plant a tree if they will be long de
227.
by jecel 5y ago
It is interesting to see such an extensive list that doesn't include Smalltalk or Forth. The lack of Pascal/Modula-2/Oberon is not a problem given Ada. Not having APL (or J or K) might not hurt if you get the needed ideas fro
228.
by jecel 5y ago
Here is a commercial bit addressed processor: https://en.wikipedia.org/wiki/TMS34010
229.
by jecel 5y ago
Indeed, the effort to port C and Unix to the Interdata forced C to evolve quite a bit (adding unions, typedefs and so on): https://www.bell-labs.com/usr/dmr/www/portpap.html
230.
by jecel 5y ago
The 68000 takes 4 clock cycles (minimum) to access memory and can read or write 2 bytes. At 8 MHz that means that the 68000 has a memory bandwidth of (8Mclocks/s/4clocks)x2bytes = 4Mbytes/s. The 6502 takes 1 clock cycle (whic
231.
by jecel 5y ago
The other popular architecture is the CPLD (complex programmable logic device) which grew out of the PALs (programmable array logic) of the late 1970s. Altera pioneered the CPLD and Xilinx the FPGA in the mid 1980s. Until recently "FPG
232.
by jecel 5y ago
Note that while the 1977 trio left their competitors in the dust, they were not the first prepackaged, preassembled personal computers on the market. But the makers of the Sphere, Compucolor II, Sol-20 and so on were terrible on the busines
233.
by jecel 5y ago
This one is written in Java: https://github.com/hneemann/Digital You can export your project as a Verilog file that can be used in the various FPGA tools.
234.
by jecel 5y ago
It was the 1991 Cavallo Plan in Argentina that tied the local currency to the U.S. dollar: https://en.wikipedia.org/wiki/Convertibility_plan The Real Plan in Brazil created a three month period with a combination of th
235.
by jecel 5y ago
The link says "$5,000,000,000 in 1964 is equivalent in purchasing power to about $44,968,064,516.13 today", which is $45 billion. Considering that the entire revenue for IBM in 1964 was $3.2 billion (1964 money), spending $5 billi
236.
by jecel 5y ago
The 2008 RoarVM project allowed Squeak to run on a 56 core Tilera chip and was later ported to run on multiprocessor x86 machines: https://stefan-marr.de/renaissance/ https://github.com/smarr/RoarV
237.
by jecel 5y ago
Yes, the preliminary (1963) ASCII had an up arrow instead of the caret and a left arrow instead of the underline. DEC, Xerox and others built equipment around the 1963 draft and failed to change when the final version of ASCII came out. Tha
238.
by jecel 5y ago
Simula I was a huge influence on Alan, as was Sketchpad (a parallel invention of object oriented programming). But Simula was a hybrid language like the later C++, so in the issue about message passing syntax Smalltalk had a certain impact.
239.
by jecel 5y ago
Imagine that you have three friends helping you with a task. You might give them these instructions: Jack, clean the shelves. Helen, sort the reports. Lucy, turn on the printer. You can see that the receiver of each message
240.
by jecel 5y ago
I am pretty sure it wasn't the case. I phoned Digitalk's Jim Anderson to try to negotiate a license to let me use their image with my 68000 based virtual machine (this was before Digitalk had any Mac versions) so I paid very close

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