shows a KDJ11-E M8981 in slot 1, an APS module M7914 >in slot 2, and slot 3 empty. Does anyone know for certain that this backplane it compatible with MSV11-J modules, and if >so in which slots they would go? We seem to have come down to one fudamental question. That is to say whats the differnce between the backplane in an 11/84 and that in an 11/94? I can confirm the actual systems were as stated above ie KDJ11-E M8981 in slot 1 APS module M7914 in slot 2 Nothing in slot 3 So how can we tell if the first three slots in each type are compatible? Rod -----Original Message----- From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org] On Behalf Of Glen Slick Sent: 18 May 2007 20:43 To: General Discussion: On-Topic Posts Only Subject: Re: The Last of The Line On 5/17/07, Rod Smallwood <RodSmallwood at mail.ediconsulting.co.uk> wrote: true for an 11/73 or 11/83 with an H9872 backplane in a BA23 box, but not for an 11/84. Figure 8-6 in EK-PDP94-MG-001_Sep90.pdf shows a PDP-11/84-A backplane with the MDM M7677 in the MDM slot, the KDJ11-BF M8190 in slot 1, a MSV11-JB/JC M8637-BA/CA in slot 2, and a MLM load module M7556 in slot 3. Not clear to me if the MLM in this case could be replaced by a second MSV11-J. The 11/94 backplane shown in figure 1-2 in EK-PDP94-MG-001_Sep90.pdf shows a KDJ11-E M8981 in slot 1, an APS module M7914 in slot 2, and slot 3 empty. Does anyone know for certain that this backplane it compatible with MSV11-J modules, and if so in which slots they would go?