PDP-8 OS/8 versions

Charles Dickman chd at chdickman.com
Fri Dec 9 18:31:52 CST 2016

I am aware of some of that. I was actually comparing using the
information in the combined kit release notes. It has information
about how to determine the version of the included programs. Some have
a command to do it, some have an address that needs to be examined
with ODT.

With OS/8, the notion of a config files changes. You make changes and
save them in the binary of the command, so a command binary can
change. You learn this after doing a build with R BUILD and then
realizing that you can't save your changes. I haven't figured out if
there is a way to load a system head into BUILD.


On Fri, Dec 9, 2016 at 7:13 PM, Vincent Slyngstad
<v.slyngstad at frontier.com> wrote:
> From: Charles Dickman: Friday, December 09, 2016 3:59 PM
>> I have some DECtapes that are V3D and I have found some RX01 images
>> from the V3D Combined Kit. The programs that are common to both are
>> different versions, so V3D changed over time.
> I know that .SV format saves some cruft along with the binary, so .SV files
> can compare different even though they are effectively the same.
> (I have some Perl code somewhere that will diff them in a way that helps
> identify this problem.  What happens is that the differences are all in the
> "tails" where .BN format provides granularity not available in .SV format.)
> It is also possible to save a program after it's been run a few times, which
> saves different values for the return addresses at the top of the
> subroutines and such.
>    Vince

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