Search found 51 matches

by Osric
Tue Aug 20, 2024 2:31 am
Forum: Newbies
Topic: New to game development
Replies: 7
Views: 7648

Re: New to game development

Is it possible for someone to emulate a computer they’ve built? I need space for a workshop, but I want to get started with writing more assembly. Is it worth it to just wait until I get supplies? or is it possible to build the computer on… the computer? Maybe you missed the previous post about ...
by Osric
Mon Aug 19, 2024 9:50 pm
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

Here's a very old one I have that's open. Thanks for the picture. Assuming they're all much the same, the internal bypass capacitor should make the effect I showed in the above screenshots almost invisible/impossible . So, perhaps unsurprisingly, it turns out my measurement was flawed ...
by Osric
Mon Aug 19, 2024 12:43 am
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

Your clock oscillator can undoubtedly has a power supply bypass capacitor in it. I guess I don't understand then, because if there's a capacitor already across the power pins of the oscillator I wouldn't expect to be able to see the voltage oscillate on every clock edge - what are the internals ...
by Osric
Sun Aug 18, 2024 8:38 pm
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

I know this is somewhat off-topic; but we're on the 7th page of this one, so small interesting side notes should be fine as long as the OP is ok with it. Off topic is where I shine ;-)

However that leads to a question: should I be making new threads for each topic in the hope that the threads will ...
by Osric
Sun Aug 18, 2024 8:32 pm
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

Let's see if I've managed to learn anything by trying to understand ground bounce / Vcc droop on a trivial clock circuit. The oscillator I have is a MXO45HS (datasheet attached). The test circuit shown in the datasheet is:
Screenshot 2024-08-18 at 4.04.32 PM.png As ever, my understanding is weak ...
by Osric
Sun Aug 18, 2024 7:49 pm
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

(I continue to think that you are digging a bit too deep for your own good - if you were doing mechanical engineering, or civil engineering, and you expressed concern about, say, the gravitational influence of Mercury or Mars, I'd be similarly concerned. Physics will tell us that everything ...
by Osric
Sun Aug 18, 2024 3:54 pm
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

Hmm, if you said electric field I'd be with you. There's no current in one branch - what's stabilising is the voltage. I definitely agree electric field would be clearer because the electric field survives the transient state.

But I believe that when the voltage is first applied, an electric and ...
by Osric
Sun Aug 18, 2024 1:32 pm
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

I see there's another video which helps visualise voltages and currents, which I posted at
Semi-OT: "watch electricity hit a fork in the road" I'd add my vote to this video, I had seen it before and for me it helped solidify my notion that the right model here is the setup time of the magnetic ...
by Osric
Sun Aug 18, 2024 1:29 pm
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

I'm only halfway through reading Vol II, as I know next to nothing about AC circuits
Once you know what an inductor does and what a capacitor does, AC analysis is initially a lot like DC analysis, except with complex numbers. Complex just means they go on a graph instead of a number line. For me ...
by Osric
Sun Aug 18, 2024 5:17 am
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

I'm only halfway through reading Vol II, as I know next to nothing about AC circuits so it's taking much more time to absorb. But the typesetting seems to have benefitted from the experience with Vol I, so I'll post it now.
by Osric
Sun Aug 18, 2024 12:58 am
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

If anyone bothers to read it and find errors in my formatting let me know
I just gave it a quick scroll, and found that things don't line up correctly in the tables, for example on pages 591-592, and 595-596. A search for ------- will turn them up, since a line of hyphens is used to separate rows ...
by Osric
Sat Aug 17, 2024 9:38 pm
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

Hmm. I replied to this thread yesterday morning, but the toobz seem to have eaten it! Anyway, here (again) is a direct link to the All About Circuits online textbook: https://www.allaboutcircuits.com/textbook/

And here is a link to an article that seems pertinent to this thread: https://www ...
by Osric
Sat Aug 17, 2024 1:36 pm
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

Ideally the ground network and Vcc network would not have any voltage between them. The reality is not the ideal though. I've been struggling with this sentence for a while and eventually decided you must mean "Ideally the ground network and Vcc network would not have any voltage within them.". It ...
by Osric
Thu Aug 15, 2024 5:05 am
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

Ground Bounce levels are typically more pronounced than Vcc Bounce levels because of the HIGH to LOW transition is trying to quickly bring a HIGH signal down to a narrow window of <400mV for a logic LOW. A low output impedance is required to complete the transition quickly. In the LOW to HIGH, the ...
by Osric
Thu Aug 15, 2024 2:55 am
Forum: Newbies
Topic: W65C02S RDY / BE pins & first build advice
Replies: 103
Views: 44524

Re: Details on the W65C02S RDY / BE pins needed

Hmm. I replied to this thread yesterday morning, but the toobz seem to have eaten it! Anyway, here (again) is a direct link to the All About Circuits online textbook: https://www.allaboutcircuits.com/textbook/

And here is a link to an article that seems pertinent to this thread: https://www ...