From: Noel Chiappa Sent: Friday, December 21, 2018 5:19 AM >> From: Mattis Lind
>> I cannot figure out which early machine it comes from. > They're called 'System Modules': > http://gunkies.org/wiki/System_Module > and they were used from the PDP-1 through (I think) the PDP-7; at least, this > PDP-7 internals image: > > https://www.soemtron.org/images/jpgs/decimages/sn113robertjohnson85680004.jpg > seems to show System Modules at the top, and FLIP CHIPs at the bottom. (I'm > pretty sure even the first PDP-8 - the 'straight 8' - uses only early FLIP > CHIPs - transistorized ones.) Noel, The PDP-7 was the first system produced by DEC which used Flip Chip(TM) technology, as well as the first to be built using a Gardiner-Denver wirewrap machine instead of hand soldering. The System Modules(TM) in the PDP-7 chassis at LCM+L make up the 550 DECtape control for the 555 DECtape drives. The controller was common to the PDP-7 and the earlier PDP-4 (which was of course all System Modules). They appear in exactly one place in the entire system. Rich Rich Alderson Vintage Computing Sr. Systems Engineer Living Computers: Museum + Labs 2245 1st Avenue S Seattle, WA 98134 mailto:ri...@livingcomputers.org http://www.LivingComputers.org/