I am the proud owner of an old pdp11/05. I does not have a M9970 (nor can I find one). So I cant do 20ma/rs232 output. I read in somebodies note about jumpers @W1 and W2 on the M7261F that I have. Apparently cutting one of these disables the onboard uart and will allow me to put in a serial card. I cant find the jumpers. Nor can I find a print set. Any suggestions?