The AdaFruit printer is TTL serial, 9600 baud: https://www.adafruit.com/product/2751


The downside is that they're about $35 per module, and you'd need three (two 8-character and one 4-character) for 20 characters.

Yea, those seem a little pricey. If you just need characters rather than dots ...

AdaFruit has printer modules for $50.

Actually the hard part I think is the display. Finding that 20 character display. It's 5 modules of 4, 16 LED segment characters each.

Looks like it's driven segment by segment, just like the KIM's was.

You can pretty easily find a serial thermal printer today (though the AIMs was not serial ...

SANE (Standard Apple Numerics Enviroment) uses IEEE 754; there is a 6502 implementation. It's also in the Apple IIgs Toolbox, but the implementation (the one in ROM, anyway) just switches to 8-bit mode and executes the 6502 code, if memory serves.

When you think about it, this makes complete ...

One advantage of something like this is that it's effectively a minimal SBC kit which is practically guaranteed to work if assembled correctly, even if you get a counterfeit CPU (as long as it's *some* kind of 6502), and even though it has very limited functionality. In short, potentially a big ...

It's a nice idea, but I really think the approach should be external, where you take some off the shelf micro controller to drive the conversation.

This way, you can make no assumptions about the chip under test (isn't there a 65xx variant out there that only has a 12bit bus?). The controller can ...

(To anybody reading this, is this big enough of a problem that we should switch to ca65? What would the advantages be? I know the Steckschwein people use it.)
A wee bit off topic, but is there a "better" open source, cross platform assembler out there for 65xx? CA65 and it's suite of tools is ...

My best success so far has been with EasyCad?? Something like that, it's "web based", but I managed to Forrest Gump my way through it.

But I was able to find an appropriate connector, and a chip mostly what I was looking for, and then I auto routed it and, oh my. But the idea of using those drawing ...

It would be curious to be able to capture the actual results and compare the diagrams amongst the different systems, see what if any changes there are (most likely from the FP implementations).

Sounds great! If only I could get a 2 layer design done.

I almost wish I could just do it in a decent drawing program by hand and ship a PDF or TIFF file than fight the ECAD tools.

There's nothing magic about RTI. It's no different than an RTS with a free pop of the status register. Other than that, it has no special properties.

What I don't know, but I'm sure Garth's interrupt primer covers, is exactly when in the NMI processing cycle another NMI fires. But as I recall, NMI ...

Yea, I'm reading. Can't say I'm understanding, but I'm reading. But I don't know a thing about Kotlin.

Also, I probably should've included this in the context, but that lda is actually inside a loop, and the manual says "it is more efficient to use the shorter sixteen-bit addressing modes, provided that the data bank register has been appropriately set" .

So speed wise, would it be better to modify ...

Finally!

Grats on your success!

We thought about building a 16-bit version of the 6502 called the 6509, we specced it all out, we got people to bid on it ... - but that became the 65816 which wound up in several Apple products.
So is he saying that his group designed, or had significant input in to the design of the 65816 ...