jrv@siemens.UUCP (04/18/86)
One very frustrating way to hang the system is to accidently request
a screen dump or logging of output to the printer when there is no
printer connected to the system. Control or Alt print-screen will do
this. One way to prevent stop the ystem form hanging is to map the print
screen interrupt, interrupt 5, to a do nothing routine or a routine
which will test for presence of the printer before continuing.
Jim Vallino
Siemens Research and Technology Lab.
Princeton, NJ
{allegra,ihnp4,seismo,philabs}!princeton!siemens!jrvalexande@drivax.UUCP (Mark G. Alexander) (04/29/86)
In article <23900016@siemens.UUCP> jrv@siemens.UUCP writes: >One very frustrating way to hang the system is to accidently request >a screen dump or logging of output to the printer when there is no >printer connected to the system. Control or Alt print-screen will do >this. One way to prevent stop the ystem form hanging is to map the print >screen interrupt, interrupt 5, to a do nothing routine or a routine >which will test for presence of the printer before continuing. If you have a printer port but no printer, use a paper clip to connect pins 11 and 23 on the port. This connects the BUSY* input to ground, so attempts to use the printer will not hang the system. I did this after my toddler son banged on the PrtSc key a few too many times. Here's how the port looks (* indicates the pins that should be connected): 13 1 o o * o o o o o o o o o o o o * o o o o o o o o o 25 14 -- #include "disclaimer.h" #include "quote.h" -- Mark Alexander {ihnp4,mot,ucscc,ucbvax!hplabs!amdahl} !drivax!alexande -- -- #include "disclaimer.h" #include "quote.h" -- Mark Alexander {ihnp4,mot,ucscc,ucbvax!hplabs!amdahl} !drivax!alexande