serial communications interface
scc0 at ioasic?
scc1 at ioasic?
driver provides support for the Zilog 8530
Serial Communications Controller (SCC) via the IOCTL asic on
TURBOchannel-based alphas (the DEC 3000 series). Each
device has two serial ports.
Input and output for each line may set to one of following baud rates; 50, 75,
110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600, 19200, 38400, or
57600. Speeds up to 230400 are supported by the chip and the motherboard, but
speeds higher than 57600 do not work reliably without an external clock
The mapping from units to serial-hardware outlets is idiosyncratic.
driver first appeared in
The IOCTL asic provides internal DMA channels that can be programmed to transfer
up to 4096 bytes of data into, or out, of an SCC without further software
intervention. This feature of the ioctl asic is not yet supported.
The mapping from device-special files (major and minor number) to chip and port
is arguably backwards.