RS232 interface with the 6551 UART
As promised in the last video, here's a look at the 6551 UART and how to interface it with the rest of the 6502 computer. This video only covers the hardware aspect. Perhaps I rambled a bit too much, but it was starting to get long and figured it would make sense to break out actually programming the 6551 into another video. As always, any feedback is appreciated before the video goes live.
And of course, thanks again for your continued support of these videos!
Thanks,
-Ben
Comments (11)
Thanks for this Ben! I added a VIA with lots of web help just before your video and kit came out. Boy, your video and kit would have saved some time! I am so happy that others will be adding serial ports to their BE6502's. It really turns the project into a 'real' computer capable of doing fun things and having a real development and debug capability. I can't wait to see what else you have for us in the future! I've got working versions of: Microchess Apple 1 Woz Monitor Eh BASIC with Ben Eater VGA PLOT, CLS, and COLOR commands https://github.com/Fifty1Ford
Referencing David Dawkins comment above - agree. In particular the VIA chip … we know the 6502 is the processor, the ROM is the ROM, and the RAM is memory - but the viewer might not remember what the VIA chip is (or not seen earlier videos).
Great video Ben. Looking forward to see how you handle interrupts as this device will need to be able to alert the cpu when it receives data.
What software do you use for the schematics? Would you consider making the original files (or at least PDFs) available for patrons?
Great stuff. The only thing I wanted was a very brief reminder of what all the chips were, perhaps with the block architecture. It gets covered bit by bit as we go through, but I couldn't quite remember what everything was upon first visit to the breadboard.
AFAIK, the > "triangle thing" on a pin diagram means edge triggered, not active low. Usually seen on clock inputs.
Will be hard to transfer from still to working schematics. Was hoping to get from his site but can not find them.
Have the kits, where is the updated schematics. Thanks.
14:48 in the video
Looks like fun. Can't wait to get started on this project.
The title says "6251", I think it's a typo right?