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Chris Osborn
Lives in Sacramento, CA, United States
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Chris Osborn

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The sixth BASIC programming challenge is happening on RetroBattlestations! The program this time is based a little bit on the very first program, except it has been changed to use a simple stack based command system to draw. Can you port the program to a new platform? How about one that doesn't even have graphics? I did a port for the TRS-80 Model II using inverse characters as "pixels."
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May have to print this up and get the boy to key it into his Apple ][...
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Chris Osborn

Software  - 
 
Now that I've fixed tcpser to support connecting to real telnet servers, several people have asked me how they can ssh from their retro computers. It's not too hard to do and I wrote up a quick guide on setting it up.
You decided to "work" from home and you're having a blast killing aliens, rescuing princesses, and finding buried treasure. And of course right while you're in the middle of solving the world's hardest puzzle an urgent call comes in from the office. Of course that means you’re going have to get up and go sit at another computer to ssh in and see what's going on. Wouldn’t it be nice if you didn’t have to do that? Using a combination of tcpser and...
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Ed S's profile photoMarek Karcz's profile photoEdward Kent's profile photo
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You can do the same thing with the c64 and a true serial interface.
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Chris Osborn

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I was able to get the Smith Corona repaired and I can now print to it from a computer! The fix was easy, just a blown fuse. But opening it required knowing the secret. I still don't have all the details on dip switch settings and escape codes for controlling formatting, but I've documented everything I've figured out and posted it here.
This article is a followup to my previous article about trying to open and repair this typewriter. It's open! Bob Will didn’t have a service manual for my Smith Corona Memory Correct 400 Messenger but he did let me in on the secret to getting a mid ‘80s Smith Corona typewriter open: pry really hard. Yes really! Before you do that you want to remove the two screws near the platen. After taking out the screws the only thing holding the cover o...
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A couple of weeks ago I picked up a Smith-Corona Memory Correct 400 Messenger at Goodwill. I debated getting it since I already have enough retro stuff around the house, but every single time I’m at a Goodwill I look at all the typewriters to see if they have some kind of serial or parallel port. This one has an external interface which can be connected to a computer using an external box called a Messenger Module. I plugged it in at the stor...
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Spent a few days last week working on getting the rolls of vinyl for my vinyl cutter off the floor and up out of the way.
Piled on the floor A couple of years ago my tiny little 9.5’ x 9.5’ guest room/craft room became overloaded when several very large printers that I had been keeping at the office got jammed in there. And with the printers in there, all of the consumables that go with them such as reams of tabloid paper, color laser cartridges, ink jet cartridges, rolls of E size paper, and many rolls of vinyl also got dumped in there, leaving no room at all. ...
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I really want to turn this typewriter into a letter quality (LQ) printer! Do you know the trick to disassemble a Smith-Corona Memory Correct 400 Messenger typewriter? Do you have a service manual that describes how to take it apart? From what I can tell the 200/300/400 all use the same case, and the earlier Memory Correct II & III use a very similar case. If you have any info on how to take apart these typewriters, please contact me!
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Chris Osborn

➥ Raspberry Pi  - 
 
Combine IoT and fireworks using a Raspberry Pi!
A couple of months ago I purchased several relay boards and switching power supplies off eBay with the plan to re-use one of my original (256 megs of RAM and no mounting holes) Raspberry Pi model B computers as a sprinkler controller. The parts arrived and I set them aside expecting to have time to work on the project after the 4th of July. About two weeks before the 4th though I realized if I got the project assembled in time I could use the spr...
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Good wiring 
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Chris Osborn

Software  - 
 
Spent yesterday making a LASM compatible 8080 cross assembler. I'm not sure how much 8080 code is still out there that was meant to assemble with LASM, but now if you want to cross assemble it without having to convert all the mnemonics to Z80 you can.
With the TRS-80 Model II working one of the first things I did with it was to send the world’s first tweet from a TRS-80 Model II. To do that I used Kermit for CP/M. World's first tweet from a @RadioShack #TRS80 Model II made in 1979! https://t.co/5trIKlhBqW pic.twitter.com/2vJffAAhGb — Chris Osborn (@FozzTexx) June 2, 2016 The TRS-80 Model II support in Kermit is missing hardware flow control support however which means that it’s very pron...
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+George Phillips Wow, bizarre. No problems compiling on two other Debian 7 64-bit boxes. And if I pull down 10aug2013 on this one, it compiles fine too. But this one box hates 3dec2014.
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Chris Osborn

➥ Show-and-tell  - 
 
Last week I sent the world's first tweet from a TRS-80 Model II running CP/M (https://twitter.com/fozztexx/status/738216319854641152). But before I could do that I had to repair the capacitive keyboard. Luckily all it took was some gift wrap and weather strip to get the keyboard working again!
My TRS-80 Model II Last weekend one of my usual sources of inspiration, @duhproject, received a Commodore 128. A lot of people on Twitter started talking their 128s, so I had to get mine out too. I thought it would be interesting to try out a true 80 column terminal program under CP/M since it was something that the 128 could do that that 64 doesn’t. It didn’t take long before I decided that running CP/M from a 5.25” drive wasn’t “CP/M enough” ...
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Gasp! You still serviced it when it warns that there are no user servicable parts?! Radio Shack won't be pleased.

...oh wait. ;)
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Chris Osborn

➥ Show-and-tell  - 
 
 
Spent a few days last week working on getting the rolls of vinyl for my vinyl cutter off the floor and up out of the way.
Piled on the floor A couple of years ago my tiny little 9.5’ x 9.5’ guest room/craft room became overloaded when several very large printers that I had been keeping at the office got jammed in there. And with the printers in there, all of the consumables that go with them such as reams of tabloid paper, color laser cartridges, ink jet cartridges, rolls of E size paper, and many rolls of vinyl also got dumped in there, leaving no room at all. ...
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Space, the final frontier....
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Chris Osborn

➥ Raspberry Pi  - 
 
This is a little Python script I cobbled together to generate signals for my oscilloscope in the recent BBS decal challenge video I made (https://www.youtube.com/watch?v=AnLArjNYp-U). Since I didn't find one ready-made out there, I figured I'd share mine. It outputs random different frequency sine waves on both the left and right channels. The original intent was to put my Tektronix 453 into XY mode, but for whatever reason it refused to work that way. But even with just the sine waves being displayed it made for a nice looking prop in the video!
Contribute to scope-patterns development by creating an account on GitHub.
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The April #BBS QSL decal challenge is on! Can you decode the hidden message?
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In his circles
64 people
Have him in circles
242 people
Brett Dawson's profile photo
Lars Klaeboe's profile photo
Kurt Årdal's profile photo
Francisco Ursulo's profile photo
Jeff Hewitt's profile photo
Thomas Smestad's profile photo
Spiro Dotgeek's profile photo
Sue Osborn's profile photo
Indigo Design's profile photo
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Sacramento, CA, United States
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I fix stuff, I build stuff, I invent stuff
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