One of my oneathesedays projects which I haven't touched in a million years is to come up with some kind of uber-simplified object-oriented system (ala Smalltalk, but CLI-oriented - so, ala GNU Smalltalk, I guess) which could run on a reasonably-specced 8-bitter.

For the past five years I've been ...

Add a stack for data. Make both the address stack and data stack relocatable (to page boundaries).

I've found his write-up on how it's done, and the principles underneath enlightening and very useful.

For the past few years I've been writing a large 6502 application framework and a number of techniques used to squeeze out more performance mirror the ones he's described. He explains simply and ...

I've been writing an application framework and encountered similar issues during development. Many of the possible approaches have already been covered in this thread, but one I've found useful is a simple dynamic allocation of memory.

For example, a subroutine that instantiated a number of ...

Mine's printed in the UK, 1st Edition, 4th printing. I have a number of other PRG editions (and printings) in my collection and the changes and errors certainly vary. Fortunately the PRG is pretty good in terms of relevant information for ML programming, and assisted my exploration of the ROM code ...

That edition has multiple errors.

For example, the entry for SETLFS on page 297. At the bottom in "How to Use", the first 2 steps are incorrect.
They SHOULD read:
1) Load the accumulator with the logical file number.
2) Load the .X register with the device number.

On page 299 the description is ...

... I've been using the in-line, pull address of the stack thing for a very long time ...

I'm a relatively new convert to inlining. Now I try to use it wherever fast execution time isn't required. The benefits I find are code size and readability.

Another cool trick (to my mind) is to declare a ...

Here's one of the generic techniques I use for inline parameters. It's assumed there is no terminator, and the number of parameter bytes is variable (the subroutine handles that).

A subroutine that is expecting inline parameters begins with jsr ISetup. The subroutine needs to exit with an RTS and ...