V08 Part 1 Breadboard VGA Controller Clean Up Nanocomp 6809 8 Bit Breadboard Micro

Building on the previous series of Nanocomp videos, this series will add a VGA style video controller on breadboards to learn about how computer and video hardware works. In this video tidy up the main Nanocomp CPU and RAM/ROM boards and get the Monitor to initialise the CRTC and Character Generator fonts on boot. Part 1 covers the design and CPU/RAM/ROM changes. Part 2 will focus on the Video Controller.
Based on the Motorola 6809 CPU and a project published in Wireless World Magazine from July 1981. Click Subscribe to not miss future videos.

Chapters
0:00 Introduction
0:58 Updates to the design for clean up
3:28 Block diagrams
3:35 KiCad Schematic Diagrams
5:37 Overview of changes
9:24 Move PLD, RAM and ROM and test
12:54 Clean up CPU board and test
15:51 Update Monitor ROM to init CRTC and Character Generator
27:56 Testing video output
28:39 End of Part 1 Next Video Part 2

[lawrencemanning]

Nice to see you using the 6809, when the 6502 and Z80 get all the attention. If you get bored you could have a go at porting my OS, though I used a V9958 for my video output. Probably not that hard overall. Have a look at my channel if you’re interested.

One tip: the schematics are very hard to read because your using symbols which are the physical representation of the ICs vs the logical representation.

Are you planning to make a PCB?

Cool projects, thanks for making vids!