From:	MERC::"uunet!CRVAX.SRI.COM!RELAY-INFO-VAX" 11-MAR-1993 02:32:33.12
To:	INFO-VAX <INFO-VAX@KL.SRI.COM>
CC:	
Subj:	re: vs4000 serial port baud rate?

There is a patch to the YFDRIVER that allows your to run a DHQ11 at 38400 baud
but it is a more than a little unsupported. VMS cannot handle the interrupts
even on a fast box (I'm told). I tried it and found that whilst one line worked
fine, two or more lines working simultaneously could cause hangs. 

If you want to run at speed let a comms controller do the biz.

If you still want to play, you might want to fiddle with this:

$ PATCH YFDRIVER.EXE
DEFINE YF$VMS_SPEEDS = 13C +0A1
DEFINE YF$DHU_SPEEDS = 13C +0B3
DEFINE TT$C_BAUD_34800 = ^D17
DEFINE DHUSPD$C_BAUD_34800 = ^D15

REPLACE /BYTE YF$VMS_SPEEDS + TT$C_BAUD_34800 = 0FF
DHUSPD$C_BAUD_34800
EXIT

REPLACE /BYTE YF$DHU_SPEEDS + DHUSPD$C_BAUD_34800 = 00
TT$C_BAUD_34800
EXIT

UPDATE

EXIT


