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Re: Number of languages known [was Re: Python is readable] - somewhat OT

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From Mark Lawrence <breamoreboy@yahoo.co.uk>
Subject Re: Number of languages known [was Re: Python is readable] - somewhat OT
Date Tue, 03 Apr 2012 16:16:18 +0100
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On 03/04/2012 15:56, Chris Angelico wrote:
> On Wed, Apr 4, 2012 at 12:46 AM, Grant Edwards<invalid@invalid.invalid>  wrote:
>> Anybody remember DEC's VAX/VMS "patch" utility?  Apparently, DEC
>> thought it was a practical way to fix things.  It had a built-in
>> assembler and let you "insert" new code into a function by
>> auto-allocating a location for the new code an hooking it into the
>> indicated spot with jump instructions.
>>
>> The mind wobbled.
>
> Not specifically, but I _have_ heard of various systems whose source
> code and binary were multiple years divergent. It's actually not a
> difficult trap to fall into, especially once you start patching
> running systems. I've had quite a few computers that have been unable
> to reboot without assistance, because they go for months or years
> without ever having to go through that initial program load. (I've had
> _programs_ that were unable to load, for the same reason.) But
> auto-allocating a new spot for your expanded function? That's just...
> awesome. My mind is, indeed, wobbling.
>
> ChrisA

Around 1990 I worked on Telematics kit.  The patches on all their 
software were implemented via assembler once the original binary had 
been loaded into memory.  They even came up with a system that let you 
select which patches you wanted and which you didn't, as e.g. some 
patches were customer specific.

-- 
Cheers.

Mark Lawrence.

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Re: Number of languages known [was Re: Python is readable] - somewhat OT Nathan Rice <nathan.alexander.rice@gmail.com> - 2012-03-29 13:48 -0400
  Re: Number of languages known [was Re: Python is readable] - somewhat OT Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-30 01:56 +0000
    Re: Number of languages known [was Re: Python is readable] - somewhat OT Nathan Rice <nathan.alexander.rice@gmail.com> - 2012-03-30 01:37 -0400
      Re: Number of languages known [was Re: Python is readable] - somewhat OT alex23 <wuwei23@gmail.com> - 2012-04-01 20:18 -0700
        Re: Number of languages known [was Re: Python is readable] - somewhat OT Nathan Rice <nathan.alexander.rice@gmail.com> - 2012-04-03 00:55 -0400
          Re: Number of languages known [was Re: Python is readable] - somewhat OT alex23 <wuwei23@gmail.com> - 2012-04-02 22:40 -0700
            Re: Number of languages known [was Re: Python is readable] - somewhat OT Nathan Rice <nathan.alexander.rice@gmail.com> - 2012-04-03 08:39 -0400
              Re: Number of languages known [was Re: Python is readable] - somewhat OT rusi <rustompmody@gmail.com> - 2012-04-03 06:51 -0700
                Re: Number of languages known [was Re: Python is readable] - somewhat OT Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-04-03 15:26 +0100
                Re: Number of languages known [was Re: Python is readable] - somewhat OT Chris Angelico <rosuav@gmail.com> - 2012-04-04 00:31 +1000
                Re: Number of languages known [was Re: Python is readable] - somewhat OT Grant Edwards <invalid@invalid.invalid> - 2012-04-03 14:46 +0000
                Re: Number of languages known [was Re: Python is readable] - somewhat OT Chris Angelico <rosuav@gmail.com> - 2012-04-04 00:56 +1000
                Re: Number of languages known [was Re: Python is readable] - somewhat OT Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-04-03 16:16 +0100
                Re: Number of languages known [was Re: Python is readable] - somewhat OT Dave Angel <d@davea.name> - 2012-04-03 12:28 -0400
                Re: Number of languages known [was Re: Python is readable] - somewhat OT Neil Cerutti <neilc@norwich.edu> - 2012-04-03 17:21 +0000
                Re: Number of languages known [was Re: Python is readable] - somewhat OT Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-04-03 12:38 -0400
                RE: Number of languages known [was Re: Python is readable] - somewhat OT Phil Runciman <philr@aspexconsulting.co.nz> - 2012-04-04 09:50 +1200
                Re: Number of languages known [was Re: Python is readable] - somewhat OT Nathan Rice <nathan.alexander.rice@gmail.com> - 2012-04-03 12:15 -0400
                Re: Number of languages known [was Re: Python is readable] - somewhat OT rusi <rustompmody@gmail.com> - 2012-04-03 10:13 -0700
              Re: Number of languages known [was Re: Python is readable] - somewhat OT Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-04-04 06:19 +0000
                Re: Number of languages known [was Re: Python is readable] - somewhat OT Steve Howell <showell30@yahoo.com> - 2012-04-04 00:07 -0700
            Re: Number of languages known [was Re: Python is readable] - somewhat OT Ian Kelly <ian.g.kelly@gmail.com> - 2012-04-03 09:01 -0600
            Re: Number of languages known [was Re: Python is readable] - somewhat OT Chris Angelico <rosuav@gmail.com> - 2012-04-04 01:05 +1000
            Re: Number of languages known [was Re: Python is readable] - somewhat OT Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-04-03 12:35 -0400
            Re: Number of languages known [was Re: Python is readable] - somewhat OT Nathan Rice <nathan.alexander.rice@gmail.com> - 2012-04-03 13:17 -0400
              Re: Number of languages known [was Re: Python is readable] - somewhat OT rusi <rustompmody@gmail.com> - 2012-04-03 10:25 -0700
                Re: Number of languages known [was Re: Python is readable] - somewhat OT Nathan Rice <nathan.alexander.rice@gmail.com> - 2012-04-03 14:42 -0400
                Re: Number of languages known [was Re: Python is readable] - somewhat OT rusi <rustompmody@gmail.com> - 2012-04-03 22:56 -0700
                Re: Number of languages known [was Re: Python is readable] - somewhat OT Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-04-03 23:50 +0100
              Re: Number of languages known [was Re: Python is readable] - somewhat OT Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-04-04 05:49 +0000
            Re: Number of languages known [was Re: Python is readable] - somewhat OT Terry Reedy <tjreedy@udel.edu> - 2012-04-03 16:20 -0400
            Re: Number of languages known [was Re: Python is readable] - somewhat OT Nathan Rice <nathan.alexander.rice@gmail.com> - 2012-04-03 16:50 -0400
            RE: Number of languages known [was Re: Python is readable] - somewhat OT Phil Runciman <philr@aspexconsulting.co.nz> - 2012-04-04 10:25 +1200

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