6502 svg schematic

[randallmeyer2000]

Single mode telecom fibers are at minimum 9 or 1 um core diameter? If I remember correctly ?

So some room for improvement.

But rememver, you have VOLUNES of space to move aroubdim a glass block, and the FOIC is just the input and ooutput mechanism.

The wires. And that's a mighty small, mighty parallel, mighty fast wire !

I'm gunna go google "duty cycle mode locked ultrashort femtosecond lasers".

See what kind of clocking function we might be able to hack.

Probably no quartz crystal frequency coupling here !!!

[randallmeyer2000]

Several DOIs seem relevant.

https://doi.org/10.1364/JOSAB.18.001732

https://doi.org/10.1038/s41377-020-0251-x


https://doi.org/10.1038/s41598-018-23027-9

These aren't great resources. I should get a nice practical book.

[joelnoche]

@davidmjc, Hello! I'm trying to use the circuit diagram you made to implement the 6502 using Digital software. (More information about it here: https://retrocomputing.stackexchange.com/q/24083/11421.) What do the transistors with an orange hexagon mean? What's special about them? Are they just ordinary enhancement-mode NMOSFETs?

[BigEd]

Hi Joel! The orange hexagons, I think, mark the bits of named state which are useful to trace or monitor. There's always a text label next to them. And in fact I see there's hover-text (tooltip) as well. (The hexagons mark a node, not a transistor.)

[org]

They denote the group of transistors that form the flip-flop.

[joelnoche]

To BigEd and org, thanks! So the orange hexagons do not denote anything different about the transistors, just the fact that the nodes associated with the transistors are special. (I didn't think of hovering the cursor over the hexagons.)

[davidmjc]

@joelnoche Yes, just to confirm that the hexagons simply denote flip-flops and have no other meaning. Thank you for your interest in my circuit diagram, but please note that I made this diagram primarily to understand the 6502, and made several changes to the original circuit, so it is probable that my circuit diagram has errors and will not work. The only working digital implementation I know is the Visual 6502, but there are many here more knowledgeable about such matters than me. If you can build a working digital 6502 based on my diagram, I would be very interested to hear about it, as well as about any errors you find in my diagram.

[joelnoche]

@davidmjc, thanks for your reply. For this semester, I'm asking my students to implement a 6502 by converting the Logisim design (discussed in viewtopic.php?f=8&t=6903) to a Digital design. Perhaps next semester I'll ask them to convert your transistor-level design to a Digital design (but I'm not sure if Digital is capable of doing so). I'll tell you if ever it happens. Thanks again.