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collapseos/blk/600
2020-06-28 16:34:41 -04:00

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