russian PDP-11 like K1801BM2 CPU Startup reading w/o address?

hello,the startup procedure of those processors is rather sophisticated,here here is what I have found: first it is for the k1801BM1 and BM2: *at beginning if times everything is at zero....(DCLO,ACLO are low) *when you apply power to the processor and the clock the clock starts immediatly and the processor begins to count clock states also *DCLO must be low for 5 ms at least ,during this time the processors clears the registers,that contain random data at powerup,at the end if this period internal INIT goes hight ,the processor begins to work *ACLO should be low for 70 ms *after there arre differences in the processors: *the 1801BM1 find the msb of the pc from address 177716(selected by SEL1),the lsb of the pc is filled with zeroes,this forms the starting address .Ths PSW is filled with value 340.This addres is in the I/O page,maybe it can be physically in a small rom, a register bank ,or in support circuit??? *for the1801BM2 the msb of the pc from a non address register (maybe a 74ls 244 programmed by a bank of switches as in the case of the T11),selected by SEL ,the lsb is filled by zeros ,this fixes the starting address in rom,the PSW is found at this addess +2 Here is what I have found ,my russian knowledge is maybe more poor as hours:-))) I have understood this from a file found on the site of Serguei Vakulenko (vak.ru,page of projects) You can find here also the pdf of the 1806 ,the successor of those microprocessors that use a similar startup procedure. I was not able to understand where those registers are from schematics of BK0010 or BK0011 because they use support chips whose docs I do not have . But the clock of those computers may be used with the timings for the startup procedure. Timing and reset circuits can be found in 'personal computers BK -0010 BK-0011 5/95 ' in the archives of BK Can you please explain more precisely what you have done??? Thanks best regards Alin Nierveze ----- Original Message ----- From: "Holm Tiffe" <holm at freibergnet.de> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Sent: Friday, December 09, 2011 6:20 PM Subject: Re: russian PDP-11 like K1801BM2 CPU Startup reading w/o address?