AST(4) - Device Drivers Manual
AST(4) - Device Drivers Manual # AST(4) - Device Drivers Manual NAME # ast - multiplexing serial communications interface SYNOPSIS # ast0 at isa? port 0x1a0 irq 5 ast1 at isa? port 0x2a0 irq 6 com* at ast? DESCRIPTION # The ast driver provides support for boards that multiplex together up to four EIA RS-232C (CCITT V.28) communications interfaces. Apparently the original master of hardware using this multiplexing protocol was AST. ...