jecel

30 ms·

361.
by jecel 6y ago
> Again, I don’t think that’s your intent, but you could consider whether, in the case of talking about Jacob Schwartz, you would have been moved to drop in the detail of who he was married to? That is actually very common in my experien
362.
by jecel 6y ago
The total fuel required is the same in both cases, but to do it in a single trip the upper stage would have to be nearly twice as large and the lower stage exactly twice as large. This is already far larger than anything that has been done
363.
by jecel 6y ago
I have no idea what George Dyson means when he says Turing had a 1D memory and Von Neumann changed it to a 2D memory. I consider both to be equally 1D with Turing having sequential access and Von Neumann random access. What I call 2D memory
364.
by jecel 6y ago
Intel likes to pretend that the iAPX432 never happened. Some friends and I were waiting for it to be released to build a machine around it, but then the Berkeley RISC papers came out with their benchmarks. Even though the 8086 was far slowe
365.
by jecel 6y ago
> The 68000 had address adders, separate from the ALU. It actually had a 16 bit "complex ALU" and two 16 bit adders (or the other way around - I can't get to my old documents in my office). The ALU was for the D registers,
366.
by jecel 6y ago
A new set of pixels every 16ms is about throughput and we do have that. But the latency today is worse than in the VGA era. If you have a completely black screen and want to draw a tiny white circle in the middle of it, it will take your pr
367.
by jecel 6y ago
It is not easy to find and even harder to actually use, but here are the sources: http://tinlizzie.org/dbjr/ I also was sent a frank.image that runs on Squeak and uses these files but don't know where that can be
368.
by jecel 6y ago
The focus of Cuis is simplicity, not tradition. So it is only closer to ST80 than Squeak in the cases where new features make Squeak "fat", like Etoys.
369.
by jecel 6y ago
Squeak was ported to iOS right after the iPhone came out. The virtual machine only had an interpreter back then but, as you said, there is not reason why the JIT (called Cog) couldn't be used as well. Apple has never allowed it on the
370.
by jecel 6y ago
We have his notebook from his 20s. So you can read it yourself and know what he was thinking then and compare it with what he published much later. https://www.3quarksdaily.com/3quarksdaily/2020/03/annus-tran.
371.
by jecel 6y ago
Though Mead & Conway students used CAD from the start, there is nothing in their method that would keep it from also being used in hand taped designs. Current attempts to design CPUs with open source tools are not so nice since they ten
372.
by jecel 6y ago
The first few generations of DRAM used the same fabs as logic circuits. But the capacitor for each bit took proportionally a larger and larger area with newer processes. So they came up with the idea of making the capacitors vertical instea
373.
by jecel 6y ago
It is interesting that you prefer Smalltalk-78 to -80. I also see that forks of Little Smalltalk 3 (which doesn't have metaclasses) are far more common that of LST 4 (which has them).
374.
by jecel 6y ago
One of the main features of the Apple-1 was its use of cheaper dynamic memories. A replica that uses static memories is actually more a nod to its competitors than to Woz's creation.
375.
by jecel 6y ago
Any project that will only be programmed in BASIC, C or something will make the processor it uses irrelevant. Only if there is some assembly will the processor matter. One fun pseudo-retro project would be an incremental BASIC compiler whic
376.
by jecel 6y ago
And after that one of Dave's ex-students put the Self technology into Javascript (V8). So you were right.
377.
by jecel 6y ago
Something like project 1 in the "Other projects:" part of this page? http://www.byrdsight.com/apple-macintosh/
378.
by jecel 6y ago
As nasty as something like this made them look, what is being discussed here makes it not unreasonable. They liked being partners with Allen but were worried about his heirs having control of their company as they might have taken it in a d
379.
by jecel 6y ago
Though RISCs are considered language agnostic, they tend to be optimized for C. One side effect of that is the elimination of rotation instructions which C doesn't have (though GCC can generate them as a special case). RISCs also don&#
380.
by jecel 6y ago
https://riscv.org/wp-content/uploads/2017/05/Wed1545-HybridD... This presentation uses a NIOS II processor to translate RISC-V instructions to a VLIW. Then it replaces the three most time critical parts
381.
by jecel 6y ago
Note that its "custom stack machine instruction set" is an interesting subset of Java bytecodes. The most common bytecodes are interpreted by a single narrow microcode instruction while the more complex ones are executed by little
382.
by jecel 6y ago
This is a 0.13µm CMOS process while the 4004 was made using a 10µm PMOS technology. So the electrical characteristics would not be the same. If you don't care about that then the answer is "yes". An attempt to do something li
383.
by jecel 6y ago
The designs have to fit in 10mm² but the total chip will be 16mm² with the pads, a RISC-V and some interfaces supplied by Google. They could obviously fit some trick into their part, but given that it too will be open source you can inspect
384.
by jecel 6y ago
There were years when not all results counted - each driver had to discard the four worst results or something like that. That favored "win or crash" drivers over reliability.
385.
by jecel 6y ago
The way I explain the unreasonable effectiveness of JITs and adaptive compilation (multiple compilers with the advanced ones focusing on the hot spots) is by contrasting constants and variables. In a long enough time frame nearly everything
386.
by jecel 6y ago
It was also the key idea in the lesser known Cecil and Slate. https://en.wikipedia.org/wiki/Cecil_(programming_language) https://github.com/briantrice/slate-language
387.
by jecel 6y ago
I agree with you in terms of implementation. But having used Windows 1 for a while and reading about Arthur/RISCOS at the time my impression was that the user experience was similar. If I had been able to actually try RISCOS I might ha
388.
by jecel 6y ago
Nikola Tesla always thought that this was a side effect of a very serious disease he had as a child. That was probably due to him never meeting other people like him, though as some comments here show they certainly exist (I count myself am
389.
by jecel 6y ago
Windows 1.0 had an icon bar at the bottom: https://docs.microsoft.com/pt-br/archive/msdn-magazine/2009/...
390.
by jecel 6y ago
Some pictures from 1983 to 2008: http://www.merlintec.com/swiki/hardware/28.html A talk about Smalltalk computers includes my projects, but I didn't make it very clear in the slides which ones are mine (13-15

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