【企業】カドカワの川上社長が辞任　ドワンゴの業績不振で　ドワンゴ新社長は「iモード」夏野剛氏★2

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864: 名無しさん＠１周年 [] 2019/02/15(金) 17:27:09.44 ID:PPEf23CJ0

>>863

ウォズニアックを軽視するものも多いようだが、コンピューターの黎明期に子供時代からCPU/ISAを自作するなどしている

https://emberify.com/blog/cream-soda-the-first-computer/
The cream soda computer was before useful microprocessors so I created the processor itself out of TTL chips.
This was an era where shift registers, counters, ALU’s were around in 4-bit flavors. In the end, I added chips to
play with this simple 8-bit processor, just like the Altair, although I had no expansion bus that I can remember.
The start was to create an instruction set. I used two common 4-bit ALU chips, I think. The minimal processor
of this sort needed some arithmetic commands and at least one branch-on-condition. I created instructions
that were either arithmetic between the one register and memory, and at least one branch or zero or branch
on overflow instruction. Not much more as I recall. I was able to enter a program which took a 4-bit number in
the lower 4 switches and multiply it by a 4-bit number in the higher 4 switches and display the result in 8 LED’s.
But inputting code bit by bit wasn’t super useful. Still, it did work and was a good prelude to my thinking 5 years
later with the Apple I and Apple ][ computers. You always move forward and the world of hobby computing was
being born around devices not much more than my cream soda computer. Oh, and my computer had 256 bytes
of static RAM in 8 chips I got from Intersil.

若年時の開発は強烈なため、ジョブズ同様にApple I開発は趣味同然だった

http://asahi.5ch.net/test/read.cgi/newsplus/1550050262/864

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