rlin@cs.ubc.ca (Robert Lin) (09/23/90)
I noticed the new serial ports on NeXTs are RS-423's, not RS-422's. Does anyone know if the old bugbears of serial flow control have been solved? I.e. do we get hardware flow control now, and does software flow control now work at bps >= 19,200? -Robert Lin <rlin@cs.ubc.ca>
louie@sayshell.umd.edu (Louis A. Mamakos) (09/23/90)
In article <9701@ubc-cs.UUCP> rlin@cs.ubc.ca (Robert Lin) writes: >I noticed the new serial ports on NeXTs are RS-423's, not RS-422's. Large improvment, leaves space on the connector for RTS/CTS. >Does anyone know if the old bugbears of serial flow control have been >solved? I.e. do we get hardware flow control now, and does software >flow control now work at bps >= 19,200? Looking at the man pages on a NextStation, it looks like RTS/CTS hardware flow control is suppored in the new release of the operating system (on 68040 systems only, the older system doesn't have CTS/RTS available on the connector). louie
clp@wjh12.harvard.edu (Charles L. Perkins) (09/26/90)
I won't bet my life on this, but NeXT told me: (1) they have hardware flow control (2) they re-did the analog section of the serial lines giving you high-speeds (38400) w/o errors but the redesign took away the +5 on ttyb (no powered serial lines now). In general, they wanted to address all known problems, but had to (for some reason) zap the +5v doing it. Charles