collapseos/blk/420

SD Card subsystem

Load range: B423-B436

This subsystem is designed for a ad-hoc adapter card that acts
as a SPI relay between the z80 bus and the SD card. It requires
a driver providing the SPI Relay protocol.

Through that layer, this driver implements the SDC protocol
allowing it to provide BLK@ and BLK!.
Move SD Card subsystem outside of RC2014 recipe and add protocols Although the SPI Relay driver is RC2014-specific, the SD Card driver is generic enough to be a subsystem. That's the second subsystem we add and this warrants, I think, the formalization of a new concept: protocols. 2020-08-17 04:30:33 +10:00			`SD Card subsystem`

			`Load range: B423-B436`

			`This subsystem is designed for a ad-hoc adapter card that acts`
			`as a SPI relay between the z80 bus and the SD card. It requires`
			`a driver providing the SPI Relay protocol.`

			`Through that layer, this driver implements the SDC protocol`
			`allowing it to provide BLK@ and BLK!.`