mark@MIMSY.UMD.EDU (Mark Weiser) (01/31/86)
The bargraph that the laserwriter prints on its test sheet on power
up has started showing strange things. Particularly, the right-hand
bar (with the '25' under it) now reaches to the top of the page, and the
top of the bar is labeled '654321024 -'. About the time
this started happening the laserwriter stopped working. I was
using it at 9600 baud from a sun. What does it mean?
-mark
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Spoken: Mark Weiser ARPA: mark@maryland Phone: +1-301-454-7817
CSNet: mark@umcp-cs UUCP: {seismo,allegra}!umcp-cs!mark
USPS: Computer Science Dept., University of Maryland, College Park, MD 20742laser-lovers@ucbvax.UUCP (02/03/86)
The problem is that one byte in the EEROM (non-volatile memory) has gotten corrupted somehow. EEROM clobbering is usually a result of your LaserWriter having a hardware problem that causes the 68000 to go out of control; it is not usually a problem with the EEROM device itself. The parameter that has been clobbered is the "batch" baud rate for the 25-pin channel. The way to fix this is to get control of the machine somehow, either by using the 9-pin channel or by setting the switch to the "1200" setting and communicating at 1200 baud. (The 1200 baud setting is fixed and does not depend on anything in the EEROM.) Then reset the corrupted baud rate parameter to the desired value, e.g.: serverdict begin 0 exitserver statusdict begin 25 9600 0 setsccbatch end Once you have done this, you can switch back to the "9600" setting and you should be back in business. For more information, see Appendix D of the PostScript Language Reference Manual. Ed Taft Adobe Systems, Inc.