Hi,
On Mon, Jan 02, 2017 at 10:32:28PM -0800, Richard Pope wrote:
     Walter,
    . . . . I appreciate all of this information. I have a revision 2.0
    board and my info shows U8 as a 96S02 multivibrator chip. I have tried
    to find a replacement for this and I have not been successful.  
I believe this is a suitable replacement. I found it while getting the
parts together necessary to build my bare IA-1010 Z-80 board.
 "AM26S02PC - Schottky Monostable Multivibrator ( 5 pcs ) - 16 Pin DIP Plastic"
   
http://www.ebay.com/itm/261370092245
Mark
--
Mark G. Thomas (Mark at 
Misty.com), KC3DRE