Author Topic: What did you buy today? Post your latest purchase!  (Read 1056457 times)

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Offline Kjelt

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Re: What did you buy today? Post your latest purchase!
« Reply #7625 on: October 17, 2018, 05:47:18 am »
Interesting; I haven't opened my 102 yet, but this looks quite similar to the RAM modules of my original TRS 80 Model 100.
My 102 seems to be fully equipped with RAM (it says 29xxx Bytes free), but the original Model 100 has only three out of four memory slots. 
These were indeed more for the Model200 which could hold 72kRAM, I believe it used bankswitching.
I gave mine away 8 years ago, sometimes I still regret that, it was a very nice piece of hardware.
 

Offline rsjsouza

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Re: What did you buy today? Post your latest purchase!
« Reply #7626 on: October 17, 2018, 06:01:37 am »
Interesting; I haven't opened my 102 yet, but this looks quite similar to the RAM modules of my original TRS 80 Model 100.
My 102 seems to be fully equipped with RAM (it says 29xxx Bytes free), but the original Model 100 has only three out of four memory slots. 
These were indeed more for the Model200 which could hold 72kRAM, I believe it used bankswitching.
I gave mine away 8 years ago, sometimes I still regret that, it was a very nice piece of hardware.
The Model 100 and the Tandy 102 go up to 32kB and the 8080 has 16 address lines - certainly some memory bank switching would be needed to get the full 72kB. 
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Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Offline scuzzyTerminator

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Re: What did you buy today? Post your latest purchase!
« Reply #7627 on: October 17, 2018, 06:36:21 am »
Quote
Searched the store products and found it. They are IS471F, "OPIC Light Detector with Built-in Signal Processing Circuit for Light Modulation System" for demodulating IR signals.

Turns out it's the tiny dot on the flat face that is the aperature.

Datasheet - https://media.digikey.com/pdf/Data%20Sheets/Sharp%20PDFs/IS471F.pdf
« Last Edit: October 17, 2018, 06:46:34 am by scuzzyTerminator »
 

Online Alex Eisenhut

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Re: What did you buy today? Post your latest purchase!
« Reply #7628 on: October 17, 2018, 10:10:29 am »
Haven't received it yet. It is "as is, for parts", no goodies shown in the eBay pictures. It's mostly because I'll finally get to take one apart myself, and hopefully fix it. Dave already took one apart.

 

Offline rsjsouza

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Re: What did you buy today? Post your latest purchase!
« Reply #7629 on: October 17, 2018, 01:43:37 pm »
Haven't received it yet. It is "as is, for parts", no goodies shown in the eBay pictures. It's mostly because I'll finally get to take one apart myself, and hopefully fix it.
Good luck. My 102 has been working flawlessly, but my Model 100 (I got a few years ago) has a very intermittent issue where, from time to time, it refuses to turn on for many retries, only to magically turn on again with absolutely no apparent reason. Any memory contents are completely wiped when this happens.

I have tried many things to make it reliable again, to no avail. I need to bring it back to my desk and try different approaches.
Vbe - vídeo blog eletrônico http://videos.vbeletronico.com

Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Offline bob225

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Re: What did you buy today? Post your latest purchase!
« Reply #7630 on: October 18, 2018, 01:47:49 am »
Sony PSP with 3 games for free - Free is always good
 

Offline NivagSwerdna

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Re: What did you buy today? Post your latest purchase!
« Reply #7631 on: October 18, 2018, 05:06:09 am »
A book on magic
 

Online technix

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Re: What did you buy today? Post your latest purchase!
« Reply #7632 on: October 19, 2018, 02:51:02 am »
I am very boring.

Those 27C4096 came with someone's code on it...
 

Offline Specmaster

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Re: What did you buy today? Post your latest purchase!
« Reply #7633 on: October 19, 2018, 04:39:24 am »
I got another TDS210 complete with a pair of probes and also a differential probe. I've after one of those for ages now and I'm looking forward to its arrival tomorrow so I can have a little play with it  ;D
Who let Murphy in?
 

Offline hscade

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Re: What did you buy today? Post your latest purchase!
« Reply #7634 on: October 19, 2018, 04:49:12 am »
A book on magic

luckily not about voodoo (HF)  :phew:
 

Offline bob225

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Re: What did you buy today? Post your latest purchase!
« Reply #7635 on: October 19, 2018, 05:40:28 am »
I got another TDS210 complete with a pair of probes and also a differential probe. I've after one of those for ages now and I'm looking forward to its arrival tomorrow so I can have a little play with it  ;D

do you know what year it is ? the early ones had a recall iirc
 

Offline Specmaster

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Re: What did you buy today? Post your latest purchase!
« Reply #7636 on: October 19, 2018, 05:50:01 am »
I haven't got a clue until it arrived tomorrow  :-DD
Who let Murphy in?
 

Online Alex Eisenhut

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Re: What did you buy today? Post your latest purchase!
« Reply #7637 on: October 19, 2018, 12:59:41 pm »
Always wanted one of these, used them in college.
 

Offline TERRA Operative

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Re: What did you buy today? Post your latest purchase!
« Reply #7638 on: October 20, 2018, 05:15:12 am »
New toy day!

Got a Yokogawa/HP 4276A LCZ meter for just under 10000yen delivered (about a hundred bucks).
Cleaned up nice for the photo (also I replaced the strips of wood it had foam taped to the bottom for feet with proper HP ones), and if I can track down the required obsolete semiconductors and transistors, I reckon I might be able to build the Option 001 DC Bias Board Assembly. The full schematics, BOM and board layout are in the service manual which is awesome.
It also needs a new 2.4V NiCd battery and maybe a card edge connector due to the usual leakage and corrosion, and a replacement fan, but it apparently works according to the seller.......

Too bad the front terminal addon options are so stupidly expensive... I might have to put the 3D printer to work to rig up a terminal slot thingo for quick testing.


I also got a fistful of capacitors from Digikey today to replace the old ones in my 8903B Audio Analyzer too.
Surprisingly almost all the caps are tantalum throughout, with only the main bulk smoothing caps and a couple others (which I think are bulk smoothing/decoupling too probably) being aluminium electrolytic.
 

Offline Specmaster

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Re: What did you buy today? Post your latest purchase!
« Reply #7639 on: October 20, 2018, 08:13:24 am »
I got another TDS210 complete with a pair of probes and also a differential probe. I've after one of those for ages now and I'm looking forward to its arrival tomorrow so I can have a little play with it  ;D

do you know what year it is ? the early ones had a recall iirc
Its arrived and it is not one of those involved in the recall, it a far newer unit and I haven't opened it up to see what the year is.
Who let Murphy in?
 

Offline Microcheap

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Re: What did you buy today? Post your latest purchase!
« Reply #7640 on: October 20, 2018, 01:45:13 pm »
A circuit break finder. My parents live in a big house with a some what old electrical installation and there is no identification for the breakers in the panel (and there are nearly 30 of them) or any diagram available so I hope it will help me organize the things a bit.
 

Online xrunner

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Re: What did you buy today? Post your latest purchase!
« Reply #7641 on: October 21, 2018, 02:05:35 am »
A circuit break finder. My parents live in a big house with a some what old electrical installation and there is no identification for the breakers in the panel (and there are nearly 30 of them) or any diagram available so I hope it will help me organize the things a bit.

Well my gosh I just searched for it on Ebay and it's only $18, how can I pass it up?  :-//
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 

Offline flash2b

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Re: What did you buy today? Post your latest purchase!
« Reply #7642 on: October 21, 2018, 02:29:20 am »
Too bad the front terminal addon options are so stupidly expensive... I might have to put the 3D printer to work to rig up a terminal slot thingo for quick testing.

A Tonghui TH26001A is an option. These can be bought on ebay and aliexpress for 40 USD.


It fitted my ZXP: https://www.circuitsonline.net/forum/view/message/1982998#1982998
 
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Offline TERRA Operative

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Re: What did you buy today? Post your latest purchase!
« Reply #7643 on: October 21, 2018, 03:59:22 am »
Oh nice! What's the distance between the BNC jacks, center to center?
 

Offline flash2b

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Re: What did you buy today? Post your latest purchase!
« Reply #7644 on: October 21, 2018, 06:10:28 am »
Standard spacing is 22mm, like:

 

(picture is from another LCR meter, so discard the 3.5mm hole)
« Last Edit: October 21, 2018, 06:16:22 am by flash2b »
 
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Offline blueskull

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Re: What did you buy today? Post your latest purchase!
« Reply #7645 on: October 21, 2018, 07:13:18 am »
Adopted a cat from my local shelter.

SIGSEGV is inevitable if you try to talk more than you know. If I say gibberish, keep in mind that my license plate is SIGSEGV.
 
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Offline Specmaster

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Re: What did you buy today? Post your latest purchase!
« Reply #7646 on: October 21, 2018, 07:36:12 am »
How sweet, I've got two like that, both with white noses, chest and 4 white socks on their feet, has your labcat got all 4 feet white?
Who let Murphy in?
 

Offline blueskull

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Re: What did you buy today? Post your latest purchase!
« Reply #7647 on: October 21, 2018, 07:42:16 am »
How sweet, I've got two like that, both with white noses, chest and 4 white socks on their feet, has your labcat got all 4 feet white?

White on outer sides, small black patches on the inner side.
SIGSEGV is inevitable if you try to talk more than you know. If I say gibberish, keep in mind that my license plate is SIGSEGV.
 
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Online chris_leyson

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Re: What did you buy today? Post your latest purchase!
« Reply #7648 on: October 21, 2018, 08:34:16 am »
@flash2b, thanks, that's confirmed my measurements 22mm spacing. I need to make an adaptor with a pair of 4mm screw terminals because the SMD tweezers are useless for larger parts.
 

Offline TheBay

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Re: What did you buy today? Post your latest purchase!
« Reply #7649 on: October 21, 2018, 09:26:46 am »
Not test equipment, but going to give it a service... New belts and caps.
Spotted this in a Charity shop today, couldn't leave it there...

Marantz (Superscope) CD-330 Professional Cassette Recorder.
It does actually play, but the belts are worn, gave it a quick wipe down and seems it's hardly been used.


Cost me the grand sum of £10!!!!

 
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