2020-05-13 14:56:38 -04:00
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SD Card driver
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Load range: 602-616
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2020-06-28 16:34:41 -04:00
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This driver is designed for a ad-hoc adapter card that acts as a
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SPI relay between the z80 bus and the SD card. That adapter is
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expected to pull CS low when something is written to SDC_CSLOW,
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high on SDC_CSHIGH and to initiate a SPI exchange when a byte is
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written to SDC_SPI, the result of that exchange being fetched
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with a read to SDC_SPI.
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Through that layer, this driver implements the SDC protocol
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allowing it to provide BLK@ and BLK!.
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