Thank you for writing all this BDD. A fascinating subject, exhaustively documented and elegantly explained. Bravo!

I've used a few including Seeed Studio, OSH Park (from back when they were Dorkbot), PCBWay and Smart Prototyping. They were all wonderful but I like JLCPCB at the moment because:


They are cheaper for larger boards, and:
For a small fee they will elide the order code from the silk screen
They ...

It's worth knowing that there's a ".autoimport" directive, which obviates the need for many .imports, though it has some caveats.

I quite like the idea. A "JSR saveregs" at the start of a subroutine so I don't have to think about preserving registers (and maybe even the carry flag) at the moment. Then come back and then optimize later. It's a shame that the approach precludes using the registers for return values.

I ...

I too have a DS1054Z with all the hacks. I love it to bits, though I don't know what to expect as a software guy, so that doesn't mean much.

Possibly going into other decoding displays (the list mode) could help with this, but I've not spend enough time hacking on this to figure out any tricks ...

Thank you all for the suggestions. I love the speaker idea for comparing relative performance. I already had cc65 but didn't realize that sim65 was there. Is the sim65 in cc65 related at all to the sim65 at http://www.wsxyz.net/sim65/?

What tools are available for counting cycles? I'm interested in comparing the performance of different implementations of a subroutine, but I don't want to count cycles by hand because I'm likely to make a mistake.

CNC routing is nice since you can skip the acid step entirely,
I love it for this reason. Even with HCl and H2O2 that can supposedly be rejuvinated, storing chemicals is not my favourite.

but you do need a way to deal with the dust it generates.
I like FR1 rather than FR4 because the dust is ...

As you say, it's unlikely a hobbyist is going to need hundreds of copies of his/her design.

I think what BigEd is saying is that if there were a design that included a 65SPI, a hardware I2C master, a wait state generator, a couple of 6551s without the transmit bug, and a DRAM controller then you ...

Hi enso,

I also like gEDA pcb . I quite enjoyed the pcb manual and read it from start to finish but I also made some notes on round-trip engineering with `gschem` (the suggested schematic capture tool) and `pcb`.

I haven't created many footprints since I just use the `DIP40` or similar footprints ...

I interfaced an iCE40 to a WDC65C02 here:

https://github.com/neilstockbridge/6502-computer/tree/master/R2

It looks like I clocked the FPGA at 12 MHz and then used a (run-time scalable) divider to produce PHI2 for the 6502. I think I used 3.3 V for the 6502 to obviate the level shifters.

The ...

Welcome, Factory! (That's an unfortunate post to have picked up for your first contribution here: most of us, most of the time, manage to avoid the sort of phrasing which is likely to divide the audience into two opposing camps. Or at least, I like to think so.)

Nicely said. Next we'll be arguing ...

I am saddened by this news. I used to see the apple wearing a bowler hat on the forum and knew I was in for a good post. Andrew touched my life.

Here's the opcode list for an as yet unreleased simulator I've been using:

https://war.rui.nz/tmp/65C02-opcodes.csv

It's just the instruction and the addressing mode, the logic for which are in the simulator.

GATE IN seems to be related to the DRAM control in the 264 series. The 7360/8360 (TED) handles DRAM refresh (Drives /RAS and /CAS, which are wired to U5 and U6 in the C16 schematic ). The MUX line is driven by the TED and is wired to GATE IN on the CPU.

Is the 7501/8501 used in any computers other ...