Finally found the last half hour to finish this 😊 happy you got it working in the end, and by the look of it you also ended up fixing it “the right way”. Remember there’s usually a read and write timing diagram in the datasheet - for this one I like the Write timing waveforms on page “58” of the Rockwell datasheet. Basically it says “everything has to be valid a bit after ø2 goes low” - and if you slow ø2 too much it won’t be, so your solution is spot on :)
Well, for me, this was one of your most fun videos. Will you be updating the PCB before you put it in the shared projects? I mean like places for the LEDs (bar ones would be better), resistor arrays instead of discreet resistors, proper pads for buttons etc., basically getting rid of the "protoboard" portion. And what is your username in shared projects?
I'm keeping the protoboard section, cos I think it's useful - means you're not limited to just buttons and LEDs. But I've also made an 8-LED bar module that has the buffer chip and resistors built in. Just 30mmx25 with a .1" pin header, so it's very space efficient. And I've added a cartridge port breakout area, since I think it quite likely that someone might say "dang I wish I had access to this or that signal" (maybe they want to add a ROM to it, for example). It's a shame you can't put photos in YT comments, lol. Oh, and there will also be 6522 VIA and 6526 CIA versions. I'll upload some pictures in the Community tab later. My username in Shared Projects is TimsRetroCorner :)
Awesome work Tim :) I absolutely love when C64 is used to do some useful work :) Sorry about the first C64 that died, hope You will manage to fix it :) Cheers!
Thanks 👍 It's a fun rabbit hole, and easy to adapt to other chips and computers (C16? VIC20? I guess anything with access to the system bus and some spare address space...)
Cool! For some kind of "automated" testing, maybe port A and B can be connected pin by pin (via resistors to be safe if both ports are set as output ...), so there can be a test to write port A (output) and reading the value on port B (input) and vice-versa.
Finally found the last half hour to finish this 😊 happy you got it working in the end, and by the look of it you also ended up fixing it “the right way”.
Remember there’s usually a read and write timing diagram in the datasheet - for this one I like the Write timing waveforms on page “58” of the Rockwell datasheet. Basically it says “everything has to be valid a bit after ø2 goes low” - and if you slow ø2 too much it won’t be, so your solution is spot on :)
Well, for me, this was one of your most fun videos. Will you be updating the PCB before you put it in the shared projects? I mean like places for the LEDs (bar ones would be better), resistor arrays instead of discreet resistors, proper pads for buttons etc., basically getting rid of the "protoboard" portion. And what is your username in shared projects?
I'm keeping the protoboard section, cos I think it's useful - means you're not limited to just buttons and LEDs. But I've also made an 8-LED bar module that has the buffer chip and resistors built in. Just 30mmx25 with a .1" pin header, so it's very space efficient. And I've added a cartridge port breakout area, since I think it quite likely that someone might say "dang I wish I had access to this or that signal" (maybe they want to add a ROM to it, for example). It's a shame you can't put photos in YT comments, lol. Oh, and there will also be 6522 VIA and 6526 CIA versions. I'll upload some pictures in the Community tab later.
My username in Shared Projects is TimsRetroCorner :)
Awesome work Tim :) I absolutely love when C64 is used to do some useful work :) Sorry about the first C64 that died, hope You will manage to fix it :) Cheers!
Very nice , shame a c64 bit the big one during testing though, glad you got it going in the end
It'll get fixed :)
Excellent work as we all have 64’s handy 👍🏻
Very nice project. Love it. To me it feels like the binary counter is backwards or should have a directional choice.
Great work and educational!
That looked really fun to build mate .. Enjoyed it ..😁
Thanks 👍 It's a fun rabbit hole, and easy to adapt to other chips and computers (C16? VIC20? I guess anything with access to the system bus and some spare address space...)
Nicely done!
Cool! For some kind of "automated" testing, maybe port A and B can be connected pin by pin (via resistors to be safe if both ports are set as output ...), so there can be a test to write port A (output) and reading the value on port B (input) and vice-versa.
Good idea.
This was really interesting. Well done!
Cheers Tommy