On 12/24/2015 9:59 AM, Michael Thompson wrote: > > We have been able to fix all types of broken flip-chips. Sourcing the > components is sometimes a challenge. The Germanium transistors for the TU20 > on the PDP-9 were hard to find. >
I remember replacing a germanium (at least I think it was) transistor on an SMS card with an ordinary silicon transistor in a 7094-II floating point unit back around 1974. Luckily, that worked fine, though for a museum I imagine one would prefer to use the "real thing". ;) > >>> >>> We found that the maintenance prints that came with the system do not >>> include ECO EM12-0055. >>> Does anyone have a set of KW12 prints that include ECO EM12-0055? >> > > The prints that came with this PDP-12 are here: > http://bitsavers.trailing-edge.com/pdf/dec/pdp12/maintenance/DEC-12-HR2B-D_PDP-12_Maintenance_Manual_Volume_2_Installation_and_Maintenance_Jun72.pdf ??? That document is not prints. I suspect you meant: http://bitsavers.trailing-edge.com/pdf/dec/pdp12/maintenance/DEC-12-HR1B-D_PDP-12_Maintenance_Manual_Volume_III_System_Drawings_Jun72.pdf Which is the same revision as mine. (I see that the 1969 edition is also there, but under the name PDP12-MaintVol3_SchemsMar69.pdf). > > Jay, we are interested in anything PDP-12 related that we don't have. > Eventually I expect I will, over the next few years, scan in everything that is not already on bitsavers, but it looks like your current needs have been met. > The PDP-12 is described here: > http://www.ricomputermuseum.org/Home/equipment/dec-pdp-12 > > Details on the PDP-12 restoration process are here: > http://www.ricomputermuseum.org/Home/equipment/dec-pdp-12/dec-pdp-12-restoration > JRJ
