I was servicing a Williams System 4 pinball MPU the otehr day and while my 6800 pod said there was a Bit 1 problem with the Long RAM test, it turned out that there was no problem with the Data 1 line. However I did have a small solder bridge between D3 & D4 which I only found by using the Williams test fixture BUS test module where it showed that D3 & D4 (buffered) where operating together. So, something to watch out for - buffered Data lines may not show up on the pod tests if there are shorts or other problems. At least with the 8T28 bi-directional buffer! John :-#(# -- How to subscribe or unsubscribe from TTL http://seven.pairlist.net/mailman/listinfo/techtoolslist _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/