Message-ID:

"jackpot: you may have an unnecessary change record" -- message from "diff"

computers / alt.sys.pdp11 / KEDQS Documentation sought

KEDQS Documentation sought

<sr48mp$ega$1@dont-email.me>

https://www.novabbs.com/computers/article-flat.php?id=394&group=alt.sys.pdp11#394

Path: i2pn2.org!i2pn.org!eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail
From: hl35...@gmx.net (hl351ge)
Newsgroups: alt.sys.pdp11
Subject: KEDQS Documentation sought
Date: Wed, 5 Jan 2022 15:07:20 +0100
Organization: A noiseless patient Spider
Lines: 17
Message-ID: <sr48mp$ega$1@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Wed, 5 Jan 2022 14:07:21 -0000 (UTC)
Injection-Info: reader02.eternal-september.org; posting-host="94b91849b0464aa77e15e371d99c21d5";
logging-data="14858"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+j34EN6WJ3otKxDLoI5TtF"
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
Thunderbird/91.4.0
Cancel-Lock: sha1:jXCxa9zL/GyRUtrIt2ageTJOgT4=

by: hl351ge - Wed, 5 Jan 2022 14:07 UTC

Hi,

the PCS Cadmus is/was a Q-BUS based 68K system. Its Unix kernel is
highly related to PDP-11 and VAX-Unix implementations.
Its kernel driver library contains a driver for a device dubbed KEDQS
which appears to be a superset of a Dilog DQ-120 mag tape formatter driver.

I am analyzing this driver code and found various operations and
functions that are not documented in the DQ-120 users guide at
bitsavers. A document found at archive.org appears to be just a bad
photocopy of the original DQ120, without the used extensions.

Does anyone have more detailed docs on this beast, or even source code
from some PDP-11 Unix where this device driver maybe stems from?

Regards
Holger