6502.org Forum Projects Code Documents Tools Forum
It is currently Fri Nov 01, 2024 2:37 am

View unanswered posts | View active topics


Board index » 6502.org Users Forum » Hardware

All times are UTC




Post new topic Reply to topic  Page 1 of 1
  [ 4 posts ] 
  Previous topic | Next topic 
Author Message
Rob Finch
 Post subject: rf6847 core
PostPosted: Thu Oct 17, 2024 11:19 am 
Offline
User avatar

Joined: Sun Dec 29, 2002 8:56 pm
Posts: 460
Location: Canada
I have been enthused to create a 6847 core in System Verilog. It will be a slight modification due to the intended output to a VGA monitor in 800x600 mode.
The display will be 50 by 25 characters instead of 32x16.
Alpha / graphics modes work in a manner similar to the 6847.
100x100, 200x100, 200x150, 200x300, 400x300 (full graphics mode)
instead of
64x64, 128x64, 128x96, 128x192,256x192

Output is the same 8 colors rendered with 6-bit RGB (2,2,2)
chars are 8x12.
Display RAM (16kB) is embedded in the core, so that external multiplexors are not needed.
There is a built in char ROM.

Meant mainly to be used in a system-on-chip.

_________________
http://www.finitron.ca
Top
 Profile  
Reply with quote  
Rob Finch
 Post subject: Re: rf6847 core
PostPosted: Thu Oct 17, 2024 11:52 am 
Offline
User avatar

Joined: Sun Dec 29, 2002 8:56 pm
Posts: 460
Location: Canada
Added legacy operation mode by pulling the 'leg' signal high.
32x16 chars centered in the display.

_________________
http://www.finitron.ca
Top
 Profile  
Reply with quote  
Rob Finch
 Post subject: Re: rf6847 core
PostPosted: Sat Oct 19, 2024 1:27 am 
Offline
User avatar

Joined: Sun Dec 29, 2002 8:56 pm
Posts: 460
Location: Canada
The photo is crappy. IRL looks much better. Taken with a phone which thought it was a QR-code.
1st mile stone: text output.
At reset a randomizer fills the screen with random characters.
Attachment:
File comment: rf6847 txt mode
rf6847.jpg
rf6847.jpg [ 370.27 KiB | Viewed 123 times ]

_________________
http://www.finitron.ca
Top
 Profile  
Reply with quote  
sark02
 Post subject: Re: rf6847 core
PostPosted: Sat Oct 19, 2024 1:29 pm 
Offline

Joined: Tue Nov 10, 2015 5:46 am
Posts: 230
Location: Kent, UK
Nice work!
Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 1 of 1
  [ 4 posts ] 

Board index » 6502.org Users Forum » Hardware

All times are UTC


Who is online

Users browsing this forum: No registered users and 17 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:  
6502.org is an ongoing project by Mike Naberezny and contributors.