> On Jul 1, 2017, at 1:08 AM, Mattis Lind via cctalk <[email protected]> > wrote: > >> Right, that's what's confusing me. I can't work out what you could possibly >> be cabling to, on the new CPU board! >> >> Those two connectors on the M7859 are used only with the 11/34, not the >> 11/04 >> (the cable from the M7859 to the programmer's front panel must be there, >> with >> both); they are there for the micro-code single-stepping function on the >> 11/34, etc. (One cable carries uclock, the other uPC data.) > > > Actually it should work with the 11/04. The 04 does have one 10 pin > connector on the board. Have a look in the manual. Page 7-1. > > > http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp11/1134/KY11-LB_MaintMan.pdf > >
The unused 10 pin “could" be for enabling an upgrade on a machine with a KY11-LA as Mattis suggests. It probably is NOT a serial port. The KY11-LA (Operators Console) was also used on the 11/34 (and 11/04). It only had controls for power (DC), HALT/CONT and BOOT/INIT. The PDP 11/34 System Users Manual (EK-11034-UG-001) has an overview of the signals involved in Figure 3-1 which come from a 10 pin cable attached to CPU backplane With the KY11-LB there is no cable attached to the backplane, as the M7859 supplies them (and more) via a 20 pin cable to the Programers Console. So it would appear the upgrade board makes provisions for both situations. Both used a seperate 10 pin cable from the H777 and controls this power supply. If you left this one connected to the Console it would still enable the DC controls. Regards, Jerry
