msr@bunker.UUCP (Michael S. Romaniw) (10/16/85)
I just got my hands on a DEC Rainbow running CPM, (no doc of course), and am running into trouble getting the printer (LA50) to work. It seems to be overflowing its' buffer at 4800 baud...dropping it to 1200 just delays the data overrun. Does the Rainbow use XON/XOFF ??? or does it use the BUSY/OUT? What about parity ???? Can anyone help ? Thanks, Mike Romaniw Bunker Ramo ...decvax!bunker!msr
campbell%maynard.UUCP@HARVARD.ARPA (10/17/85)
The Rainbow and the LA50 both, by default, use XON/XOF synchronization.
There's a switch on the LA50 (switch SW1, position 6) that controls whether
XON/XOF or Ready/Busy is used; XON/XOF is selected by having the switch
in the open position (towards the front of the printer).
Something else to be aware of is that a very common failure mode of the
LA50 PCB is that it loses XON/XOF synchronization (I suspect the buffer
full check fails). I've seen this happen on at least two different
printers. You should try borrowing someone else's LA50 and see if the
problem goes away. Unfortunately, DEC doesn't repair LA50's... they
throw them away and sell you a new one, for just a bit less than list
price.
--
Larry Campbell decvax!genrad
The Boston Software Works, Inc. \
120 Fulton St. seismo!harvard!wjh12!maynard!campbell
Boston MA 02109 / /
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ARPA: campbell%maynard.uucp@harvard.arpa