6502.org Forum  Projects  Code  Documents  Tools  Forum
It is currently Sun Jun 02, 2024 9:01 am

All times are UTC




Post new topic Reply to topic  [ 26 posts ]  Go to page Previous  1, 2
Author Message
 Post subject: Re: Saying Hi/ My build
PostPosted: Wed Jul 07, 2021 4:12 am 
Offline

Joined: Sat Jul 03, 2021 4:25 am
Posts: 49
Only a small update:

I pulled a SST 39VF512 90ns Flash ROM from an old NVIDIA graphics card and tested it out, works great! Whipped up a 3.3v circuit for it using a TOKO TK11432M regulator. Puts out a steady 3.21V. Haven't hooked it up yet but this should give me a slight edge over my AT28c256 and has more room for future projects. Now, with a 3.3v source I can easily implement any other 3.3v elements into my project if need be.


Attachments:
20210706_230102.jpg
20210706_230102.jpg [ 3.41 MiB | Viewed 579 times ]
Top
 Profile  
Reply with quote  
 Post subject: Re: Saying Hi/ My build
PostPosted: Wed Jul 07, 2021 5:59 pm 
Offline

Joined: Sat Jul 03, 2021 4:25 am
Posts: 49
Received my HP PS/2 keyboard today and it does work, I'm typing this post with it right now. Its actually very nice to type on, makes my wireless modern keyboard feel spongey and much less responsive. I guess my 6502 will be my go-to for luxurious typing experiences :lol: Will post updated pics after I get it hooked up.


Top
 Profile  
Reply with quote  
 Post subject: Re: Saying Hi/ My build
PostPosted: Wed Jul 07, 2021 8:49 pm 
Offline

Joined: Sat Jul 03, 2021 4:25 am
Posts: 49
This keyboard definitely works. However, my project is broken somewhere. I am using 2 74HC595's to take in the 11 bits of data from the keyboard but they aren't putting anything out. I'm going to look over the datasheet but everything appears to be connected correctly. I was using some Chinese knockoff 595s and swapped them for 2 TI that I had in a 'logic beginners' kit but same thing. All outputs sit at 5V. If I can't figure it out and whip myself into a homicidal rage I'll resort to pestering everyone here for help but half the fun (if that's what one calls it) is solving the problems yourself.


Top
 Profile  
Reply with quote  
 Post subject: Re: Saying Hi/ My build
PostPosted: Wed Jul 07, 2021 8:59 pm 
Offline
User avatar

Joined: Thu Dec 11, 2008 1:28 pm
Posts: 10816
Location: England
It's almost always possible to get to the answer, by careful checking, and the application of doubt to your assumptions, and working from hypotheses to consequences.

I must point out, though, that it would be sufficient to say that you replaced some knockoff components. Saying "chinese" in that context is a mistake, in several different ways, and I find it problematic. There's one person here who has consistently failed to understand this point, but there's no need to follow a bad example. (I apologise in advance for the possible thread derail: I recommend a new thread anyway, for a debugging adventure, with an appropriate title. As you move from one conundrum to the next, consider a new thread for each. It helps with finding information later, and it helps to avoid megathreads, and also to minimise the effect of thread drift.)


Top
 Profile  
Reply with quote  
 Post subject: Re: Saying Hi/ My build
PostPosted: Wed Jul 07, 2021 9:11 pm 
Offline

Joined: Sat Jul 03, 2021 4:25 am
Posts: 49
Ok, I wasn't sure how to structure this. I figured keeping the build 'adventure' in one thread would keep from littering the other sections with noobish spam but whatever you suggest. Also, in this context, this is chinese knockoffs, it says so on the package :lol: (not sure why the pictures are sideways :? )


Attachments:
20210707_160848.jpg
20210707_160848.jpg [ 3.76 MiB | Viewed 524 times ]
20210707_160724.jpg
20210707_160724.jpg [ 3.5 MiB | Viewed 524 times ]
Top
 Profile  
Reply with quote  
 Post subject: Re: Saying Hi/ My build
PostPosted: Wed Jul 07, 2021 9:27 pm 
Offline
User avatar

Joined: Thu Dec 11, 2008 1:28 pm
Posts: 10816
Location: England
OK, if someone buys the cheapest stuff, they will probably find themselves buying from China, and if they are not careful about the supplier, sometimes they will get bad stuff. If they think that's a problem with Chinese suppliers, they've made an error, because it was their choice to proceed in that way. China is a major supplier of manufactured goods and Chinese suppliers quite capable of shipping good product. By putting price first and failing to take into account the customer-supplier relationship one makes an error. One has failed to understand the way global commerce works and failed to understand cultural differences.

We have threads elsewhere which aim to address this problem, of how to buy online without coming a cropper. So it's best if we don't rehash this over and over in other threads.

Speaking as you did is essentially perpetuating a lazy stereotype, and you're not the only one to do that, and I'm rather tired of it, which is why I mention it now. Nationality is very rarely a useful way to categorise things on this forum.


Top
 Profile  
Reply with quote  
 Post subject: Re: Saying Hi/ My build
PostPosted: Wed Jul 07, 2021 9:58 pm 
Offline
User avatar

Joined: Fri Dec 11, 2009 3:50 pm
Posts: 3362
Location: Ontario, Canada
ThisWayUp, if you do end up asking for assistance, be sure to post your circuit so we can examine it. And in any case, be sure you're aware of the function of the *two* clock inputs on the '595.

-- Jeff
PS:
ThisWayUp wrote:
[...] but same thing.
Looks to me as if the "knockoffs" may yet prove to be satisfactory.

_________________
In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html


Top
 Profile  
Reply with quote  
 Post subject: Re: Saying Hi/ My build
PostPosted: Wed Jul 07, 2021 10:27 pm 
Offline
User avatar

Joined: Sat Sep 29, 2012 10:15 pm
Posts: 899
Racism aside, it is practically redundant to qualify any electronic gear and components with the word Chinese, as pretty much everything is made there.

_________________
In theory, there is no difference between theory and practice. In practice, there is. ...Jan van de Snepscheut


Top
 Profile  
Reply with quote  
 Post subject: Re: Saying Hi/ My build
PostPosted: Thu Jul 08, 2021 2:02 am 
Offline
User avatar

Joined: Thu May 28, 2009 9:46 pm
Posts: 8197
Location: Midwestern USA
ThisWayUp wrote:
Ok, I wasn't sure how to structure this. I figured keeping the build 'adventure' in one thread would keep from littering the other sections with noobish spam but whatever you suggest. Also, in this context, this is chinese knockoffs, it says so on the package :lol: (not sure why the pictures are sideways :? )

Those look to me to be counterfeits. The SN prefix on the part number is a TI thing. Whomever made/remarked these chips were likely trying to fool the buyer into thinking they were getting TI product.

_________________
x86?  We ain't got no x86.  We don't NEED no stinking x86!


Top
 Profile  
Reply with quote  
 Post subject: Re: Saying Hi/ My build
PostPosted: Thu Jul 08, 2021 2:16 am 
Offline

Joined: Sat Jul 03, 2021 4:25 am
Posts: 49
I'm fine with it as long as they work! And as far as counterfeits go, these look pretty good and have pretty good quality pins unlike most that break when you look at them. What's even more confusing is that I tried to 'verify' them in my TL866II+ that supposedly can test logic chips, it said the 10 I tested were all bad. But then I tested the two TI 595's I have and it said those were bad too :lol: I guess today just isn't my day. That's why I started a thread for the actual issue and if I have the energy after loading an OS on a laptop with a fresh SSD after the HD died I might also hook up an arduino and try to use the registers to blinky some leds.


Top
 Profile  
Reply with quote  
 Post subject: Re: Saying Hi/ My build
PostPosted: Thu Jul 08, 2021 11:00 am 
Offline
User avatar

Joined: Thu Dec 11, 2008 1:28 pm
Posts: 10816
Location: England
Thanks for the new thread. I'm not sure I personally can help, but I'm sure someone can.
PS/2 keyboard logic issue

One of the difficulties when debugging is knowing what to doubt. If a circuit worked before, and you changed one thing, and you know what it was, that's the easiest case. But with something newly constructed which hasn't yet worked, using parts not used before, that takes some methodical investigation.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 26 posts ]  Go to page Previous  1, 2

All times are UTC


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to: