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http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

Well, we are enthusiastic hobbyists, who goes "Wow, on my table (25 +/-2 C) with this one chip it works nearly all the time!", while manufacturer position is "per standard this and that I thereby claim and guarantee, that every single chip in full thermal range -40 to +85 C will every single time fullfill the paragraph 123.456 of the standard and will accept value anywhere from this point up as perfectly valid high input, under the risc of lawsuits" - so those ranges are usually where the manufacture is pretty sure, it would work in all conditions every time and rarely states much more, than standards, until it is selling point

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http://micro-corner.gilhad.cz/, http://8bit.gilhad.cz/6809/Expanduino/Expanduino_I.html, http://comp24.gilhad.cz/Comp24-specification.html, and many others

Exactly.

I have a commercial design which specifies a particular logic gate by manufacturer, exact part number with all the pre- and post-fixes. Not just the family and logic number... everything.

Other parts work, in testing. That part is guaranteed to. And I don't want to have to repair several hundred thousand a year when other parts fail.

Neil

p.s. to my knowledge, *none* of the devices have failed due to electronic failure. Mechanical failure, customer damage, water ingress, sure. But no electronic failures.

Some of the SRAM and flash memory I was looking at was 3.3V, but I probably won't use them to keep the voltage lines simpler. Again, the only part that is set in stone here is the 65C816 at its heart. I'm trying to come up with a list of parts that meets my needs before making any purchases for this project. I'm trying to steer things more to a split 1.8V/5V setup with only the FPGA video chip being on the 1.8V, but 5V parts get harder and harder to find as time goes on.

There's a few reasons I want to lean away from the MicroSD card. Part of it is that I want it to function like a 16-bit handheld from the mid-to-late-90s. You didn't have electronics with their firmware on a removable microSD card. Maybe some high end cameras had them as storage, but not firmware. The other reason I'm leaning away from MicroSD is cost. A flash memory chip with more than enough storage for what I think the firmware will look like is maybe a dollar. The smallest MicroSD card I can buy from a reputable dealer/manufacturer? $4 before you factor in additional complexity, and possibly hardware, needed to take that serial data and read it into parallel data for the 65C816. I'd rather just keep everything on parallel storage. Early prototypes will be on a flash chip either in a DIP package or on a DIP adapter so I can remove it from my breadboard and slot it into my programmer for quick rewrites. Once I move onto PCB prototypes, I intend to have headers for reprogramming the firmware flash chip and the video FPGA if I don't put them in ZIF sockets.

If the ILI9341 is too slow to handle 320x240@60 FPS with 15 or 16-bit color, then I'll have to find a different LCD driver chip, I would assume. It sounds like my options are either purchasing one with a different driver or purchasing the display and driver separately so I have a suitable one in my project.

Does anyone know if the ILI9341 would be able to handle the target of 16-bit color (65,536 colors) at 60 fps if all it's being sent is pixel color and a clock signal from the FPGA? If not, can someone show me how to tell which ones can so I can start looking for another LCD? I'm looking at other options now, especially after spotting a few cheaper 3.2" LCD that use different controller ICs and 3.5" ones that are decently priced if nothing else in the project pushes the budget.

ST7789V, ST7272A, HX8238 and HX8347A are the driver ICs on the screens I was looking at, but I'm not sure where to look to see which ones can handle the 60 FPS goal.

The ILI9341 has a parallel data interface as well as SPI; you can use one or the other. I have successfully connected one of the prebuilt modules from AdaFruit to the 6502's data bus, the only extra component I needed was a '245 to actually put it's data lines into a tristate when my 6502 wasn't directly reading/writing to the device.

I haven't done any speed tests on it yet, but I was able to get it to respond to initialization commands and light up a pixel, w/o any fuss. I'm currently running my 6502 at about 6.3Mhz, the timing diagrams on the data sheet (if I'm reading them correctly, which I may not be) suggest it's happy to go up to about 12Mhz when being used in it's "8080 I/II" parallel mode.

The module I'm using

that's exactly what i said, but Ardis specifically asked about the SPI interface after i mentioned that the ILI9341 had both because they wanted to avoid using a very wide interface (even though it also has an 8-bit wide interface which is a lot easier to deal with than the 18-bit one they mentioned and is highly recommended over SPI for HW/SW overhead reasons)


ey, i also linked to the same board from adafruit (or rather a similar variant)

Odd, not sure why you would want to constrain yourself to SPI if the parallel mode is easier to use and faster.