kakemoms wrote:
I do want to point out that you may want to have a way to «mask» those bits or have the paging system to ignore them (at some point). The reason is that you can then point to the page by one (or two) instructions and ignore page setting on the next instructions. It is more work hardware-wise, but makes things alot easier when programming.
kakemoms, you have touched on a very important point here. Most banking schemes are painfully inefficient when you consider the low-level code that's tasked with actually "talking" to the banking hardware. Thoughtful hardware design can partially eliminate the inefficiency.
ETA: but Kevin mentioned wanting to run Fuzix, and I'm not sure how that impacts the situation. It may be that the low-level inefficiency is baked into Fuzix subroutines in a way that's infeasible to update.
-- Jeff
_________________
In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
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