Don, I now have the DIGITAL OUTPUT portion of my MBPII card  WORKING !!!
Basically I stacked a second 74LS08 on top of IC8, Stack-solder pins 3, 7 and
14, (flair out the rest of the pins on TOP IC). Two insulated jumper wires are
needed, each about 3 inches long. Solder one jumper wire from pin 1 of the top
IC8 to pin 12 of IC9 ( the nearest 74LS138 ), Solder the second jumper wire from
pin 2 of the top IC8 to pin 15 if IC9. NOTE: < From the flaired pins of the top
IC8, I ran the two insulated jumper wires thru the two holes just below IC8 and
soldered to the pins of IC9 on the non-component side of the card>. Doing this
enabled the data to flow THRU the 74LS245 and flash the LED in the MBPII card.
Happy Holidays! ..... Mac in Memphis   12/28/93