Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.python > #22641
| From | Phil Runciman <philr@aspexconsulting.co.nz> |
|---|---|
| Date | 2012-04-04 09:50 +1200 |
| Subject | RE: Number of languages known [was Re: Python is readable] - somewhat OT |
| References | (13 earlier) <jlf1b9$hhh$1@dough.gmane.org> <mailman.1275.1333463503.3037.python-list@python.org> <jlf2fo$6mm$1@reader1.panix.com> <CAPTjJmokK8SsTP4nLv7Wiu7PUcmPUWnj5LUzsmmHxJ7+kxgnuA@mail.gmail.com> <jlf482$ci1$1@dough.gmane.org> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.1302.1333489838.3037.python-list@python.org> (permalink) |
> -----Original Message----- > From: Mark Lawrence [mailto:breamoreboy@yahoo.co.uk] > Sent: Wednesday, 4 April 2012 3:16 a.m. > To: python-list@python.org > Subject: Re: Number of languages known [was Re: Python is readable] - > somewhat OT > > 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. > In the 70's I worked with Honeywell 16 Series computers controlling a variety of systems. The patches were loaded as a starting address followed by machine code, using a piece of software for this purpose. This all sounds rather similar to Mark's situation. The reason however is less obvious. On the H16 series we did not have a multi-access O/S and the process of assembling and linking a large system involved many steps. Often the modifications required were trivial. It was generally easier to reload a memory dump from off paper tape and then apply the patches. Phil Runciman
Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
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
csiph-web