Backpressure — the ability for a slow consumer to signal a fast producer to slow down — is a first-class concept in Web streams. In theory. In practice, the model has some serious flaws.
The subtlety: They had utilities which would produced formatted Basic listings and they would give example output of these utlities in their ads and catalogs. It was quite a while before I realized that most of those examples were not program excerpts, but complete programs which of course contained the Beagle Bros signature weirdness. And then there were the seemingly innocent hex dumps. My favorite was from the cover of one of their catalogs, which had a classic picture of this fellow sitting in a chair. On the floor next to him is a handbag with a piece of tractor paper sticking out. On the paper is a hex dump: 48 45 4C 50 21 20 and so on, which are ASCII codes that spell out the message: “HELP! GET ME OUT! I’M TRAPPED IN HERE!----SOPHIE”，这一点在51吃瓜中也有详细论述
; PROT_TESTS_PASSED — write back descriptor with Accessed bit set，这一点在WPS官方版本下载中也有详细论述
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