timur@seas.gwu.edu (The Time Traveler) (02/13/91)
I want to disable the parallel port by making the computer think that it's sending data. I think that if you short two (or more) pins, then the data-sent signal (or whatever it is) is always triggered, making the computer think that the byte it just sent was received, and it can send the next one. Can anyone help me?
timd@hotwheel.dell.com (Tim Deagan) (02/13/91)
In article <2716@sparko.gwu.edu>, timur@seas.gwu.edu (The Time Traveler) writes: > I want to disable the parallel port by making the computer think that it's > sending data. I think that if you short two (or more) pins, then the > data-sent signal (or whatever it is) is always triggered, making the > computer think that the byte it just sent was received, and it can send > the next one. > > Can anyone help me? Curious question. Do you want the computer to not think the parallel port is not present (rewrite the installed hardware status word at 40:10 to clear bits 14-15 which represent the installed parallel adapters)? Or do you want to have the computer not hang when it writes data to a port with nothing attatched (you could possibly try this: short pin 10 (ACK#) to pin 1 (STROBE#) short pin 15 (ERROR#) to pin 16 (INIT) WARNING!!!!!! I haven't actually tried this!! It is based on my observation of the pinouts of the parallel port. Submit this to general discussion before implementing, I will not assume responsibility for frying your parallel port! On the other hand, it should work. :-) ) I'm still not sure what it is you're really trying to do. All parallel ports are not the same, some are bidirectional, others are not. It'll be easier to prescribe a fix if the problem is stated clearer. ------------------------------------------------------------------------ ------------------"Wake up! Wake up!" - Spike Lee --------------------- ------------------------------------------------------------------------ Rev. Tim Deagan timd@hotwheel.dell.com timd@twaddle.dell.com
robin@uhunix1.uhcc.Hawaii.Edu (Robin Amano) (02/14/91)
In article <2716@sparko.gwu.edu> timur@seas.gwu.edu () writes: >I want to disable the parallel port by making the computer think that it's >sending data. I think that if you short two (or more) pins, then the >data-sent signal (or whatever it is) is always triggered, making the >computer think that the byte it just sent was received, and it can send >the next one. > >Can anyone help me? For PC Technician you need a loop back plug to test the port. Here is the jumpers you need to make the male db25 connector. 5-| 15-| 6-| 13-| 7-| 12-| 8-| 10-| 9-| 11-| One customer had a xt compatible portable and needed to demo a sales package. He wanted to run the program without a printer, so to fake out the computer we came up with this: GND pins 11 & 12 or: 11-| 25-| 12-| 24-| Hope this helps. -- -------------------------------------------------------- Robin Amano | robin@uhunix.uhcc.hawaii.edu UHCC | 2565 The Mall | Honolulu, HI 96822