I don't remember what it is called but it's a method where characters before the cursor are stored at the start of the block and characters after the cursor are at the end of the block, with a big gap in between to allow fast editing. When the cursor moves (or at least when an edit starts) you ...

Could it be that the 100µF capacitor is too large? I had a similar problem in the 80s with a home-made memory expansion for the Vic-20, where I had gone a bit overboard with the capacitors; the problem went away once I removed a large(ish) capacitor, leaving only the decoupling capacitors.

Instead of splitting the opcode into nibbles, you might be better off considering grouping into 3+3+2 bits: https://llx.com/Neil/a2/opcodes.html

Bah... I think I got that 100% wrong. Sorry.

Should that be rather than ? I think the latter indicates that the base pointer is volatile, but the former that what the pointer points at is volatile.

Seconded!

I was wondering whether the overflow flag might be useful for these comparisons, and found this page:

https://www.righto.com/2012/12/the-6502 ... ained.html

Looks like a good explanation of integer operations on the 6502, in general.

There's also https://www.tejotron.com, but that seems to lack support for the 65c02 instructions.

[
BTW, what do GitHub users do wen they are in the middle of a programming project, need to check out a file for editing and their Internet service goes on the fritz?
git is a distributed version control system, so 99% of the time developers do not need to have access to github, or even internet ...

[
BTW, what do GitHub users do wen they are in the middle of a programming project, need to check out a file for editing and their Internet service goes on the fritz?

git is a distributed version control system, so 99% of the time developers do not need to have access to github, or even internet ...

I'm very sorry to hear that. My condolences.

Unix is probably not an acronym, although it was trademarked as "UNIX".
According to the authors of THE UNIX PROGRAMMING ENVIRONMENT (Kernighan - Pike, Prentice-Hall 1984), “UNIX” is a pun on “MULTICS,” which was the project that Ritchie and Thompson worked on before the latter got started on what ...

Historically, many operating systems and languages were all capital letters. I “grew up” with FORTRAN and COBOL. Back in the day, Ken Thompson’s and Dennis Ritchie’s favorite operating system was “UNIX,” not “Unix,” etc. C came from B, which came from BCPL, etc. So, referring to Plasma as PLASMA ...

Stefany Allaire (of c256foenix fame) has a cycle-accurate 6809 module with a 65c02-compatible pinout: https://c256foenix.com/product/fnx6809/ . Maybe not all that interesting from a performance point of view, but might be a fun experiment for other 65c02-based platforms.

Also, Ted Fried ...

Do you actually need 4 address bits? It might be possible to free up 3 address pins by having just two addresses, where one address would be used to specify the "register" number... that would require slightly more complex software to drive, and probably also be slightly less efficient, but might ...