[TUHS] A re-analysis of some DECtapes from dmr

[Warren Toomey via TUHS]

On 7/12/24 08:58, Warren Toomey via TUHS wrote:
> All, I received this detailed e-mail from Yufeng Gao who has done a great
> job at analysing some of the DECtapes that Dennis made available to the
> Unix Archive.P.S. I have a follow-up e-mail coming ...

Here is a follow-up e-mail from Yufeng, I just needed to ensure the 
colours got preserved :-)

Cheers, Warren

---- From Yufeng Gao ----

If you're going to share my email, please consider adding the following 
information about the s1 and s2 files being from the same version of UNIX:

"The maki.s source and a.out executable found in /usr/sys is the exact 
same maki program used to create the INIT tape, judging by the 
unzeroed/leftover bytes at the end of vcboot."

And the row highlighted in green from the following table to the one 
from my last email:

                | UNIX V1  | s1    | UNIX V2

----------------------+----------+-------+---------

Warm boot             | [1]73700 | ???   | ???

Cold boot             | 1        | 1     | 1

Unassigned 3K prog    | 2        | 2     |

Dump core & halt      | 10       | 10    | 10

Boot from RK          |          | 20    | 20

Dump core & warm boot |          | 40    | 40

Boot from paper tape  | 0        | 0     | 0

Load DEC loaders      | 57500    | 57500 | 77500

----------------------+----------+-------+---------

*BOS load address      | 54000    | 54000 | 154000*

UNIX load address     | 400      | 400   | 600

----------------------+----------+-------+---------

Sorry if I sound like I'm asking for too much, the history is quite 
important so I want everything to be in the best possible state :).

Sincerely,

Yufeng Gao
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