Join Early Retirement Today
Reply
 
Thread Tools Search this Thread Display Modes
Update
Old 02-10-2014, 06:20 PM   #101
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
travelover's Avatar
 
Join Date: Mar 2007
Posts: 9,879
Update

Quote:
Originally Posted by travelover View Post
I found something interesting recently, re Radio Shack components. I needed a 25 watt resistor and found that Radio Shack on-line had it for $1.21, but with $6.99 shipping.

Thinking that I might order one from China cheaper, I copied and pasted the description into eBay. Up comes one from Radio Shack - $1.21 with FREE shipping.

Probably packaged by the same guy, at the same facility in either case.
I got my resistor today - delivered FedEx to MI from NJ. No way did they make a profit on that sale.
__________________

__________________
Yes, I have achieved work / life balance.
travelover is online now   Reply With Quote
Join the #1 Early Retirement and Financial Independence Forum Today - It's Totally Free!

Are you planning to be financially independent as early as possible so you can live life on your own terms? Discuss successful investing strategies, asset allocation models, tax strategies and other related topics in our online forum community. Our members range from young folks just starting their journey to financial independence, military retirees and even multimillionaires. No matter where you fit in you'll find that Early-Retirement.org is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with our members, see fewer ads, upload photographs, create a retirement blog, send private messages and so much, much more!

Old 03-14-2014, 02:20 PM   #102
Thinks s/he gets paid by the post
ls99's Avatar
 
Join Date: May 2008
Posts: 4,792
A few weeks ago found a Technics 3200 turntable at Goodwill, $10.-. Hauled it home, it worked fine. It is a direct drive turntable.

My previous acquisition was Radio Shack linear tracking record player. And was modified to work on 12VDC. The primary voltage source at the camp. This Ratshack machine is at my camp. There the temperature variations are pretty extreme. When not there inside temperature will go down to 16F or less. The Ratshack player works well but is belt driven.

I have now modified the Technics TT to work on 12VDC. Nice thing about servo controlled platter drives is the electronics, and the resulting precise speed control. Next trip will swap out the turntables. The direct drive machine will not be effected by large temperature swings. Unlike the rubber band driving the TT.

By the way this summer's project will be the solar heating which I never got around to last summer. Gotta make use of the dozens of computer cooling fans sitting in a large box..... somewhere, I know they are around here.....
__________________

__________________
There must be moderation in everything, including moderation.
ls99 is offline   Reply With Quote
Old 03-14-2014, 03:56 PM   #103
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
braumeister's Avatar
 
Join Date: Feb 2010
Location: Northern Kentucky
Posts: 8,597
This reminded me that the other day I found this deep in the bottom of a forgotten box in the basement.

It's the motherboard from my 1987 Mac Plus. Hard to believe it was considered state of the art at the time. Individual ICs, resistors, coils, etc. all soldered on the board.
Attached Images
File Type: jpg mac.jpg (241.4 KB, 8 views)
__________________
braumeister is online now   Reply With Quote
Old 03-14-2014, 04:02 PM   #104
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
NW-Bound's Avatar
 
Join Date: Jul 2008
Posts: 19,403
Looks like the biggest chip at the center of the board is a 68K CPU chip. About that time, I did a bit of assembly language programming with the 68020 CPU (younger and bigger brother of the 68000) and the 68881 math coprocessor for an aerospace application. The hand-written assembly code was needed for a fast loop, when I saw that the code generated by a Fortran compiler truly sucked.
__________________
"Old age is the most unexpected of all things that can happen to a man" -- Leon Trotsky
NW-Bound is offline   Reply With Quote
Old 03-14-2014, 04:43 PM   #105
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
braumeister's Avatar
 
Join Date: Feb 2010
Location: Northern Kentucky
Posts: 8,597
You're right, it's a 68000.
That was a real learning experience for me. I did my first assembly coding with the 6502 in my 1980 Apple II+ and the difference between them was huge.
__________________
braumeister is online now   Reply With Quote
Old 03-14-2014, 04:53 PM   #106
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
NW-Bound's Avatar
 
Join Date: Jul 2008
Posts: 19,403
The instruction sets of the 68020 and 68881 were so orthogonal that I was typing assembly code just as I was looking at the Fortran source code for that fast-loop subroutine. In other words, I was able to be a "human" compiler without much effort at all. I loved it.

But, but, but, when I later benchmarked the 68020/68881 against the Intel series, the latter won big! The instruction set of the Intel 8086 to the current Intel CPUs is anything but orthogonal, but their ad hoc machine code is shorter for more frequently used instructions and that gives them a speed advantage. Motorola later gave up further development, and fell further behind.
__________________

__________________
"Old age is the most unexpected of all things that can happen to a man" -- Leon Trotsky
NW-Bound is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Selling old vintage books??? Orchidflower Other topics 12 07-17-2010 08:22 AM
Vintage Leica Camera Midpack Other topics 8 01-01-2009 12:42 PM
80% off EVERYTHING but electronics/giftcards @ borders.com... gotta order NOW though thefed Other topics 3 08-31-2008 11:22 PM
Elementary Electronics Confusion TromboneAl Other topics 2 06-08-2008 07:12 PM
Bad year for electronics... cute fuzzy bunny Other topics 101 02-10-2006 10:59 AM

 

 
All times are GMT -6. The time now is 06:45 PM.
 
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.