Re: Zip Chip programming info / disk image?

[bieling@terra.es (Jorge Chamorro Bieling)]

Michael J. Mahon <mjmahon@aol.com> wrote:

> Hard to fix in general, so the "slow mode" escape must always
> be provided.
...
> "Timing is everything."

Furthermore, 

Sometimes, "timing" means much more than cycles per opcode

Sometimes it is important even the *order* of the *events* that take
place in the address/data bus *while* an instruction is executing.

See for example the story about STA $C08F,X, in the chapter about the
disk II, Understanding the Apple II, page 9-22.

And the softwitch in the CFFA to deal with 6502 read-before-write
cycles.

And... who knows ? (but there are more of these, for sure)