overlord@spock.UUCP (Rick Link '85 off) (03/25/85)
I am having some trouble interfacing a DIGITAL Letterprinter 100 to a Vax 11/750 running 4.2bsd UNIX. I have tried almost every different combination of switches on the LA100 (XON/XOFF,Modem Control,Restraint and Speed modes) to no avail. The printer seems to be allowing the incomming data to overload its input buffer. It then emits a series of beeps and prints garbage. If anyone out there is currently using a LA100 Letterprinter connected to a similar system as ours, I would appreciate it if they could send me a letter documenting their switch settings. Thank you, Rick Link decvax!yale!spock!overlord
gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>) (03/29/85)
> ... The printer seems to be > allowing the incomming data to overload its input buffer. It then emits > a series of beeps and prints garbage. ... I don't think your problem is in switch setting, but rather in the need to enable DC3/DC! (XOFF/XON) flow control on the terminal port. This is done by setting the LITOUT mode and leaving the port in "cooked" (non-RAW) mode with DECCTLQ set so that flow control is done.