On Mon, 28 Oct 2019, Steve Nickolas wrote:
> 86-DOS actually did use ":" as a prompt character. This was changed for
> IBM's release, for some clone releases, and for MS-DOS 2.0.
The best I've ever seen was RT-11's "." - talk about minimalist...
Actually this thread probably belongs on COFF by now.
-- Dave
Sorry, sent a picture along with this, but it got rejected because it
was too big ;)
> On 10/28/2019 3:10 PM, Lars Brinkhoff wrote:
>> I was bound to happen. List all the prompts!
>> "*" seems popular on PDP-10s.
>
> Que? The only PDP-10 prompt that matters is "."
>
> The other less-desired (by me) is @
>
> art k.
[Redirecting to COFF]
On 2019-Oct-20 00:02:56 +0530, Abhinav Rajagopalan <abhinavrajagopalan(a)gmail.com> wrote:
>Forgive me for both hijacking this thread, and to address my amateurish
>gnawing concern, but how was it be possible to write differential/integral
>equations at an assembly/machine level at the time, especially in machines
>such as the PDP-7 and such which had IIRC just 16 instructions and operated
>on the basis of mere words, especially the floating point math being done.
My 1st edition Wilkes, Wheeler, Gill[1] documents that, by 1951, EDSAC[2]
had a floating-point library that supported addition, subtraction and
multiplication (no division) of numbers with 23-27 bits of precision and a
range of 1e-63 to 1e63. EDSAC was much less powerful than a PDP-7.
Writing a floating-point library is not that difficult, though getting
the rounding correct for all the edge cases is tricky. Actually using
floating-point and avoiding the pitfalls can be harder - see (eg)
https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html (though
https://floating-point-gui.de/ may be more approachable).
[1] https://archive.org/details/programsforelect00wilk
[2] https://en.wikipedia.org/wiki/EDSAC
--
Peter Jeremy
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“The most dangerous thought that you can have as a creative person
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