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mg_notes:apple_iic:firmware_bank_switch [2017/07/17 15:56] M.G. |
mg_notes:apple_iic:firmware_bank_switch [2017/07/25 16:15] (current) M.G. |
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| It is not possible to know which firmware bank is active except by reading locations in the firmware, there is no status bit available in the I/O space. | It is not possible to know which firmware bank is active except by reading locations in the firmware, there is no status bit available in the I/O space. | ||
| - | The ROM $00 machines may be upgraded to use a 32K ROM via a pair of solder/trace jumpers on the board. | + | The ROM $00 machines may be upgraded to use a 32K ROM via a pair of solder/butterfly jumpers on the board. |
| The aux bank mostly contains firmware supporting the features not present or less mature in the original Apple %%//%%c: 3.5%%"%% drive/SmartPort, serial and keyboard buffering, memory expansion card, diagnostics, and (for the Plus) accelerator. | The aux bank mostly contains firmware supporting the features not present or less mature in the original Apple %%//%%c: 3.5%%"%% drive/SmartPort, serial and keyboard buffering, memory expansion card, diagnostics, and (for the Plus) accelerator. | ||