Hi, if you want some (very) basic code idea, I did something similar with a Teensy a few years ago. It’s not for Pico, but it’s very simple C code anyway. It helped me build my 6502 on a breadboard by adding real parts one after another: I started with the teensy emulating everything but the CPU ...

Do not only check for loose connections, but if you have a multimeter, do a continuity check on the address lines between CPU and EEPROM. You might have swapped some address lines (like CPU-A3 going to EEPROM-A4 and vice versa).

Hi, you could also try a CH375 or CH376 board. It costs less than 5€, gives you USB host on one side and parallel 8bit or SPI on the other side. Not a lot of documentation available but enough to make it work. It’s normally meant for usb-host storage, but supports also keyboards and mice.

Very interesting thread indeed.
It got me thinking, what about a mix of Double Duty and Write when black ?
If there are two memory chips, one used by the CPU and one used by video circuit, when we reach vblank for example, a counter based circuit copies from main RAM to video RAM on the low Phase of ...

Programming will be OK for the ATF16V8C, I have a XGecu TL866II Plus too and already programmed many ATF16V8C, ATF16V8B, ATF22V10C, etc… It’s really straightforward, I would love the wincupl part of programming to be as simple…

I've successfully used an open source program called "palwiz" by Bruce Tomlin (who I believe posts in the Atari Age forums). I have the source myself and can send it, although I'm not finding an online source right now. I ran it on MacOS but it's just a simple C program and so it should compile for ...

Hi,
I lost an evening again trying to get some decoding logic on an ATF16V8B and I was wondering if there was any alternative to WinCUPL ?
I’ve searched a bit here and on the web, and apart from GALasm I don’t see any other software to program these GALs.
WinCUPL could be a nice solution, but I’m ...

If you can’t wait until Garth comes back you can have a look there : https://coronax.wordpress.com/2012/11/1 ... n-circles/
It helped me a lot when I started playing with 6502 a few years ago.

Hi, you could do a free run using a few resistor and led on a breadboard.
If you wire properly the different signals to VCC and GND, you just have to wire data bus so it always reads $EA(NOP).
If you have LEDs on the address bus, you should see it incrementing.
The only thing is you have to ...

I was looking at the specs for SST39SF010, and it looked pretty good: 128K x 8 at 55ns or 70ns, and under $2.00! My cheapo programmer claims to support them...

Has anyone here tried to use one of these? cbmgeeks, I just saw you mention the same chip a couple of years back. Any luck?

Hi,
Yes, I ...

Hi everyone,
This is a long overdue introduction as I joined 6 month ago.
Not surprisingly I work in IT mostly on systems, DB and other infrastructure related stuff.
I discovered the 6502 with my second computer an Atari 600XL in the early 80s and soon moved to an Apple //c.
Last year I decided ...