6502.org Forum  Projects  Code  Documents  Tools  Forum
It is currently Sat May 18, 2024 3:35 am

All times are UTC




Post new topic Reply to topic  [ 78 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6
Author Message
 Post subject: Re: Advice needed on SBC
PostPosted: Fri Feb 08, 2019 12:56 am 
Offline
User avatar

Joined: Thu Jul 26, 2018 4:08 am
Posts: 40
Michael wrote:
Floopy wrote:
... I'm currently running the LCD with an 8 bit data bus and 3 extra lines for the control pins. If I could reduce it down to just 4 bit (send two 4 bit instructions instead of one 8 bit) then I could use the extra I/O on the VIA for exterior control.

Have you considered using an LCD "Backpack"? The PCF8574 based I2C backpacks work well, too.


Thank you! With that in mind I only need three pins to control as many displays as I need. My programming skills is usually what lacks behind.

_________________
-Floopy


Top
 Profile  
Reply with quote  
 Post subject: Re: Advice needed on SBC
PostPosted: Fri Feb 08, 2019 1:10 am 
Offline
User avatar

Joined: Fri Aug 30, 2002 1:09 am
Posts: 8438
Location: Southern California
Floopy wrote:
I'm currently running the LCD with an 8 bit data bus and 3 extra lines for the control pins. If I could reduce it down to just 4 bit (send two 4 bit instructions instead of one 8 bit) then I could use the extra I/O on the VIA for exterior control.

Remember you can use the same lines for other things as well. The LCD doesn't care what's on its D0-D7 and RS and R/W\ when its E is false; so go ahead and use them as outputs to a parallel printer and to strobe the rows of a keyboard for example. These won't care what's on those lines when you're feeding the LCD either. Again, you can put loads of things on the same VIA at the same time.

_________________
http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?


Top
 Profile  
Reply with quote  
 Post subject: Re: Advice needed on SBC
PostPosted: Fri May 22, 2020 10:47 pm 
Offline
User avatar

Joined: Thu Jul 26, 2018 4:08 am
Posts: 40
Hello hello,
I'm somewhat back, I've been the worst at updating things on here. I've been away for a year and I didn't have what I needed to keep going with this, but now that's not the case :D

So, I've mostly worked on programming and I'm still not very good, Being more efficient at what it does is something that needs to be improved, but the more I learn the more versatile this thing is getting. I've managed to somehow figure out on how to use shift registers and now I have a lot more outputs to work with. I get a lot of instability with Flash memory so I switched back to using Eproms. Which takes a lot longer to work with. (Maybe I sound like I'm impatient, who knows).

Currently I'd like to redesign the board and make something I can mount in something and take it where I need to. With a few additions and also fix the tiny messes I had to patch in the first board. Most are mechanical improvement, but I want to have a 6551, I've got a few.

Just an update.
-Thank you

_________________
-Floopy


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 78 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6

All times are UTC


Who is online

Users browsing this forum: No registered users and 5 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: