I thought I'd throw this one out to those who know more than I about the PDP 11/40 I am working with DaveR on vcfed.org/forum who asked me to run the following program as a test from the front panel:
20 - 220 ; IOT trap vector (New PC) 22 - 340 ; IOT trap vector (New PSW) 200 - 012706 ; MOV #600,SP 202 - 600 204 - 240 ; NOP 206 - 0 ; HALT 210 - 4 ; IOT 212 - 240 ; NOP 214 - 0 ; HALT 216 - 0 ; HALT 220 - 0 ; HALT 222 - 0 ; HALT START the program running from address 200. ---------------------- Problem is - The IOT step is bombing (?) and loops through the addresses: 204 206 210 200 204 206 210 200 endlessly. Anyone care to speculate which CPU card is the culprit? -- @ BillDeg: Web: vintagecomputer.net Twitter: @billdeg <https://twitter.com/billdeg> Youtube: @billdeg <https://www.youtube.com/user/billdeg> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>
