foone, 3 months ago

I was gonna say "besides 32 and 10/13 and 65" but then I realized I was falling into the trap of that xkcd about how experts overestimate how much non-experts know

foone, 3 months ago

The weird thing is that I always have to look up the codepoint for | despite using it all the time. I just have a hole in my memory for that one codepoint.

It's 124, btw

domi, 3 months ago

@foone god, you remember ascii codepoints in dec? i thought everyone memorized them in hex!

dalias, 3 months ago

@foone ESC is 0x1b/033/27, and is ^[, and so [ is 64 plus that making 91, \ then 92, lowercase is +32 so | is 124.

yakkoj, 3 months ago

@foone I know a good chunk of those codepoints in both decimal and hex (it's what using "CHR$()" in BASIC and then using 6502 assembly does! ;o)

Since I came from Apple II, I know them with high bit both set and cleared

moira, 3 months ago

@foone 7,8,11,12,97,127 all in decimal like y’did in the RSTS/E past.

hex was weird octal was l33t and i wasn’t quite that l33t

rrmutt, 3 months ago

@foone Capital “U” is 0x55: if you send a bunch of those out the serial port you get an almost-square wave, from which you can deduce the baud rate on a scope

oblomov, 3 months ago

@rrmutt @foone

Mind_blown.gif

foone, 3 months ago

@rrmutt clever

vascorsd, 3 months ago

@foone totally normal 🙃. Been able to avoid knowing or interacting with anything that required that knowledge.

Totally surprised that it's such a big thing in the comments 😅

sldrant, 3 months ago

@foone I used to know a few key ascii vs ebcdic code points once upon a time as we always have conversion issues (people forgot to ftp or check in as text rather than binary files) while testing against mainframes and knowing the first few Bytes were wrong made a massive difference in debugging. Can barely remember any now.

astrid, 3 months ago

@foone just a few landmarks honestly, "man ascii" is rarely far away

nblr, 3 months ago

@astrid @foone Mostly just “fixed offsets do exist and are useful”.

lanodan, 3 months ago (edited 3 months ago)

@foone Yeah, mostly because of URL-encoding. (%20 for space, %2F for slash)
Also I know A-Z starts at roughly ~0x40 and ends before 0x60 (where a-z roughly starts).
And 0x7F for DEL, which is also end of ASCII.

lanodan, 3 months ago

@foone Also %C3%A9 is one I somewhat recognise (é in latin-1 and utf-8) but don't remember.

neko68k, 3 months ago

@foone its not ascii but I've known alt+0172 for a long time ¬_¬

kroc, 3 months ago

@foone I used to have a number of ALT codes down pat, does that count?

mcc, 3 months ago

@foone I think the only one I have memorized is 32 but if I know that one I can technically derive several of the others from first principles

mcc, 3 months ago

@foone Also I know 0xA is either CR or LF but I don't remember which so this doesn't help

Also of COURSE I have 127 memorized, because how could you forget? Why is that even there? Who thought this was a good idea

whitequark, 3 months ago

@mcc @foone you scream each time you encounter Unix and Unix uses LF; AAAAAAAAAA

Windows uses Active Directory so it's ADADADADADAD

mcc, 3 months ago

@whitequark @foone amazing

whitequark, 3 months ago

@mcc @foone you have to separately remember that it's CR LF and not LF CR for this mnemonic to work though so maybe it's not so good

njsg, 3 months ago

@whitequark What's your mnemonic for non-UNIX MacOS?

whitequark, 3 months ago

@njsg CR(ickets)

domi, 3 months ago

@whitequark @mcc @foone in unix, you scream

meanwhile windows is a crazy russian guy going “haha, YES YES YES YES YES YES YES YES YES”

domi, 3 months ago

@foone multiple ones

and i’m always on my autistic way to learn more