RK611 schematics

Allright, I had a look at the schematics during the lunchbreak to prepare for some measurements this evening. Let me know if my conclusions from a look at the schematics are ok, so far. On page 'M7900 UNIBUS INTERFACE (UB7)' the databus bit 15 is connected to the tranceiver 8641 (E10) pin 15. If pin 9 (UB7 ENA DATA DRVRS L) is '0', input pin 14 appears inverted at the pin 15. As the diagnostic says that it expects 000200 on reading CS1, and the result is 100200, you can say 2 things: 1) 'problem' with data bit 15 (where ever) 2) as the signal "UB 7 ENA DATA DRVRS L" is common to E3, E10, E11, E2, and E1 that signal must (?) be OK, because that signal enables all other databus bits, which seem OK. So, either E10 (in #14, out #15) is defective, or the problem is already with the signal driving pin 14 ("TS REG BUS 15 H"). Since I don't have a 4-channel 'scope, and I need to follow 3 signals (in/out/enable), I guess I will get out the D100 again. - Henk. This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.