Here's what I do know about IIGS's and Accelerators:
The accelerator card plugs into the expansion slot, which exposes the memory and data lines on the system. The accelerator's processor is usually clocked much quicker than the stock apple II bus, and using cache memory, transfers the main system ROM to onboard cache memory. Then, upon boot-up, the shadowed ROM becomes the main ROM and in essence, the accelerator recreates an entire Apple II on that board. The only off-board activities that occur are when the system addresses the memory or data lines, like when reading/writing memory or reading/writing from drives, etc.
Now what I don't understand :
How does the accelerator card interrupt the normal ROM from being found and being run? (might be that the accelerator ROM's address sits at the same location the original ROM sits, but then how does it get "found" and copied?)
How could I take advantage of this faster processor clock to provide expansion capabilities to other "cards" such as IDE, etc?
The accelerator card plugs into the expansion slot, which exposes the memory and data lines on the system. The accelerator's processor is usually clocked much quicker than the stock apple II bus, and using cache memory, transfers the main system ROM to onboard cache memory. Then, upon boot-up, the shadowed ROM becomes the main ROM and in essence, the accelerator recreates an entire Apple II on that board. The only off-board activities that occur are when the system addresses the memory or data lines, like when reading/writing memory or reading/writing from drives, etc.
Now what I don't understand :
How does the accelerator card interrupt the normal ROM from being found and being run? (might be that the accelerator ROM's address sits at the same location the original ROM sits, but then how does it get "found" and copied?)
How could I take advantage of this faster processor clock to provide expansion capabilities to other "cards" such as IDE, etc?
