Welcome to decuser's blog

Topics on this blog include computing, retro-computing, operating systems, math, and whatever other technical subjects I happen to be exploring that I find interesting enough to take and share notes about.

Posts

• Dec 11, 2015 unix research-unix v6

  Adding tar to Research Unix Version 6 Running on a PDP 11/40 in SimH

  This note explains an approach to getting a working version of tar running on Research Unix Version 6 (v6) running in a SimH PDP-11/40 Simulator.

  NOTE: After working at this for a bit, it is clear to me that while this is workable as a solution to move files from v6 to v7, it is not workable as a true tar for v6. The program has difficulty with directories, timestamps and such when working natively on v6. The issues are not with the instructions outlined below, but rather with limitations of the original program as delivered with v7. More investigation is required to understand its limitations.

• Dec 7, 2015 unix research-unix v7

  Installing and Using Research Unix Version 7 in SimH PDP-11/45 Emulator

  This note is intended to document the process of running v7 in a PDP-11/45 emulated environment. A previous note covers [v6]({% post_url 2015-11-23-installing-and-using-research-unix-v6-in-simh-pdp-11-40-emulator %}) originally posted November 23, 2015 and there is a more recent note covering [v7]({% post_url 2017-10-11-installing-and-using-research-unix-v7-in-simh-pdp-11-45-and-70-emulators-rev-1.6 %}).

• Nov 23, 2015 unix research-unix v6

  Installing and Using Research Unix Version 6 in SimH PDP-11/40 Emulator

  This note is intended to document the process of running v6 in a PDP-11/40 emulated environment. A subsequent note covers [v7]({% post_url 2015-12-07-installing-and-using-research-unix-v7-in-simh-pdp-11-45-and-70-emulators-rev-1.0 %})

• Feb 23, 2015 hardware raspberry-pi

  Raspberry Pi B+, i2c, and DS3231 RTC

  Here are some notes on how to get your pi talking to a cheapo DS3231 Realtime clock using nothing more than a pi, an ethernet cable (for downloads), a serial cable, and an RTC.

• May 6, 2004 programming mono

  HelloMono - Mono on Windows XP

  An article I wrote back in the day (2004-05-06)and published on CodeProject. The article is rated 4.11 and has been viewed more than 229k times as of October 21, 2025.

  https://www.codeproject.com/articles/HelloMono-Mono-on-Windows-XP

• Apr 30, 2004 programming c#

  hello, world - A primitive view of the state of the art

  An article I wrote back in the day (2004-04-30) and published on CodeProject. The article is rated 4.67 and has been viewed more than 161k times as of October 21, 2025.

  https://www.codeproject.com/articles/hello-world-A-primitive-view-of-the-state-of-the-a

• Jan 4, 2002 programming c++

  LogDriver - A simplified log4j using C++

  An article I wrote back in the day (2002-01-04) and published on CodeProject. The article is rated 4.73 and has been viewed more than 192k times as of October 21, 2025.

  https://www.codeproject.com/articles/LogDriver-A-simplified-log4j-using-C-