johnsondavies

The ATtiny814 is hardly an ancient chip. It's a member of Microchip's TinyAVR 1-Series that was released in 2017 and still being developed, with the 2-Series being released in 2020/2021.

Perhaps you're confusing it with the older ATtiny841 (released in 2012), which was an upgrade of the original ATtiny84.

You're correct that the ESP32-C3 is based on a RISC-V processor, but it has more in common with the other ESP32 boards than it does with the boards supported by the RISC-V version of uLisp, so it made sense to support it with the ESP version of uLisp.

Good idea - I'll add a column to the tables giving the current consumption for each board.

The assembler is two-pass.

The assembler is two-pass and the labels are simply local variables in the defcode form. They are assigned the value of the program counter in the first pass, and the assembler instructions are evaluated in the second pass. I got the idea from the assembler in the Acorn Atom, if anyone remembers that.

Thanks - corrected "compact" to "compressed".

Sorry, I'd posted the link to the code in the wrong format - corrected now. Would you like to delete that copy?

As mentioned in the article I used Elecrow, who made 5 boards for $24.14. I accept that the unit cost will be more if you're only making one.

Thank you for putting my 16 LEDs Puzzle on Hacker News! Yes, the principle is similar to Lights Out, but in my puzzle pressing a button toggles its LED and all the other LEDs on the same diagonal(s). I found that this rule is harder to solve, even on a 4x4 grid.

I pronounce it 'U'-Lisp.