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mg_notes:apple_iic:mig_chip [2018/08/01 15:55] M.G. [Apple IIc Plus MIG Chip] |
mg_notes:apple_iic:mig_chip [2018/08/01 19:40] (current) M.G. [MIG Address Space] |
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| ===== MIG Address Space ==== | ===== MIG Address Space ==== | ||
| - | Obvious access to the MIG is via a 1024-byte (or more... see below) window at $CC00 (mirrored at $DE00) that becomes visible only when the aux firmware bank is selected. | + | Access/control of the MIG is via a $800-byte window starting at $C800 when the aux firmware bank is selected. The window is repeated at $D800 (I/O select is mediated by the lower half ROM select), but is not usable unless the accelerator is disabled. The lower $600 bytes of this space is shared with the ROM, and the upper $200 bytes is used for the MIG RAM window and other control functions. |
| ==== MIG Control ==== | ==== MIG Control ==== | ||