Re: Encapsulating Ada.Direct_IO

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On Thu, 18 Nov 2010 21:57:10 -0800, Dennis Lee Bieber wrote:

> On Thu, 18 Nov 2010 18:05:49 +0100, "Dmitry A. Kazakov"
> <mailbox@dmitry-kazakov.de> declaimed the following in comp.lang.ada:
> 
>> On Thu, 18 Nov 2010 08:31:20 -0800 (PST), Adam Beneschan wrote:
>> 
>>> Then there was a
>>> DEC machine that used 36-bit words and represented strings by sticking
>>> five 7-bit ASCII characters in each word, but I don't remember much
>>> else.
>> 
>> RADIX-50?
>> 
>> http://en.wikipedia.org/wiki/DEC_Radix-50
>> 
> 	Why bother... 5 * 7bit => 35bits, easily fits into a 36bit word with
> one left over!

Because 3*7 = 21 >> 16. Under RSX-11, RT-11 they packed 3 file name
characters into one 16-bit word. With 64K address space that was important.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de