ard at p850ug1.demon.co.uk
Fri Sep 1 18:31:11 CDT 2006
> Billy: This brings up a question I had for the group. In the early =
> hex was not very popular. And it hadn't become a standard to use A-F. =
> worked on one hex machine that used lower case i,j,k,l,m,n and another =
> used upper case U, V, W, X, Y, and Z.
> Does anyone remember using any other notations? There must have been =
On an ASCII machine, J..O was not unhead-of (for the reason that if you
take the low number of the character you get the appropriate binary
Philips P850-series 'binary' puper tapes were, in fact punched with 4
chaacters to store a word. The top 4 bits of each character were ignored,
the bottom 4 were taken as the nybble value. So 0..9 and J..O was one set
of characters that could be used for this.
> I took a C class many years back where the instructor started out with =
> statement that all computers use word sizes that are multiples of 8 =
> bits. I
That's news to me (and news to many machines I have around here).
> couldn't help laughing. After class, I explained to her why and =
> the G-15, RPC-4000, etc. I feel a little that way now on the discussion =
> octal - how soon we forget.
> I want to mention to Tony that I've worked on computers for 40+ years =
> were multiples of 3. And at one time, they were the biggest and the =
Sure. I was a little over-strong with my statement. There were plenty of
3n bit machines, I suspect many list members have one (a PDP8, for
OK, most _modern-ish_ machines have a word length that's a multiple of 4
bits. That's why hex is more popular than octal now, I guess.
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