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alex_m1
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CEO
Re: backwards
alex_m1   6/24/2014 10:33:01 AM
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@max:... all we could afford was constants

:-) i trully hope that with moore's law you could afford yourself some delicious variables someday :)

Max The Magnificent
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Blogger
Re: Ooh-ee!
Max The Magnificent   6/24/2014 9:59:20 AM
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@rob18767: My view, is that if the system can't run games, it's not an embedded system ;)

I love it -- I'll be using thsi line in my embedded systems talk at ESC Brazil at the end of August!

Max The Magnificent
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Re: backwards
Max The Magnificent   6/24/2014 9:56:59 AM
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@betajet: Yes indeed, a magic spell called DEC RADIX-50 which encoded 26 upper-case letters plus 10 digits plus a few punctuation marks into a number from 0-39, and then multiplied the first character by 1600, the second by 40, the third by 1, and added them all up.  So why "RADIX-50" instead of 40?  Well, we PDP-11 dudes always preferred thinking in octal :-)

I remember RADIX-50 -- we used to use it on little GENRAD PCB functional testers (I think they were the 2225 testers) -- I thought the whole concept of RADIC-50 was absolutely brilliant.

Max The Magnificent
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Re: backwards
Max The Magnificent   6/24/2014 9:51:55 AM
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@alex_m1: ...nowhere to store variables...

At least you had variables -- we used to dream of variables -- all we could afford was constants -- but we didn;t complain -- we considered ourselves to be lucky :-)

Max The Magnificent
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Re: Ooh-ee!
Max The Magnificent   6/24/2014 9:49:20 AM
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@Garcia: Sanfermin time at Navarra again!!

Again??? I can't believe a year has gone by so fast.

kfield
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Re: Ooh-ee!
kfield   6/24/2014 9:04:44 AM
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@maxthemagnificent  Be there or be square!  Love to chat on the chat about whether we should bring back the name "Embedded Systems Conference?" After all, teenagers are wearing old spice these days so retro is in!

kfield
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Blogger
Re: Ooh-ee!
kfield   6/24/2014 9:03:28 AM
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@wnderer  That's quite clever - I have to say it aloud to actually figure it out. (Now I'm trying to think of what I can say to top it!)

rob18767
User Rank
Manager
Re: Ooh-ee!
rob18767   6/24/2014 9:00:56 AM
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I have worked on embedded systems for 30 years and I have the same problem. 

My view, is that if the system can't run games, it's not an embedded system ;)

That said the Altera 'SoC's are interesting. They are expensive however they cut down development risk. That said, a $12 ARM processor and a separate $15-$25 FPGA will probably do the same job. However if you don't know what you are doing then clearly the Altera 'SoC's eliminate that risk. 

 

 

zeeglen
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Blogger
Re: backwards
zeeglen   6/23/2014 10:30:36 PM
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@betajet Watch out for negative zeroes!

And divide-by-zero?  Multiplication is repeated addition, division is repeated subtraction.  The concept of divide-by-zero simply means that one can subtract zero from a quantity forever without changing the value of that quantity.

So why do computing machines have such a problem with this?

(note: this is not intended to be completely serious)

betajet
User Rank
CEO
Re: backwards
betajet   6/23/2014 10:09:24 PM
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Max wrote: I remember the days when you could only use 8-character variable names...

You got to use eight?  Pfui, I only got 6.  The Univac 1100 series had 36-bit words, so you could fit six 6-bit ASCII upper-case characters in a single word and compare names as integers.  Watch out for negative zeroes!

On the PDP-11 you could fit 6 characters in 32 bits.  Magic, you ask?  Yes indeed, a magic spell called DEC RADIX-50 which encoded 26 upper-case letters plus 10 digits plus a few punctuation marks into a number from 0-39, and then multiplied the first character by 1600, the second by 40, the third by 1, and added them all up.  So why "RADIX-50" instead of 40?  Well, we PDP-11 dudes always preferred thinking in octal :-)

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