Michael J. Mahon wrote:
Thanks. I was indeed thinking that every store instruction causes two accesses. If not, the solution I gave above seems to be ideal, provided you use an absolute address, not some expression that has to be calculated at runtime (which will compile into an y-indexed indirect store)....which is exactly the problem with slot-relative addresses.
It is. But then, the only real "toggle" switches, where the same address switches both ways, are the speaker and cassette outputs, I think. Or are there any more?
(I removed the non-apple groups from this one) -- Linards Ticmanis