PDP 11 Core Memory - H214 Memory Stack

Tom Gardner thomas.gardner at sbcglobal.net
Fri Nov 5 13:48:15 CDT 2010


There are several pictures of an 8 KiWord H214 Memory Stack posted on the
Internet, for example, see 

http://www.conservatique.com/_/rsrc/1251146207239/pdp/pdp-1105/H214-c...
<http://www.google.com/url?sa=D&q=http://www.conservatique.com/_/rsrc/125114
6207239/pdp/pdp-1105/H214-core-plane%3Fheight%3D167%26width%3D200&usg=AFQjCN
GgCgWQk-XDZ2griejhV44yO10CAQ>  

At least one DEC manual describes the H214 as having "16 memory mats
arranged in a planar pattern" but the photo referenced above (and many
others) show 20 memory mats arranged in a two x ten planar pattern. 

Two by ten is a very strange array for a machine that has a 16 bit word or
18 bits in one with the byte parity option. 

Can anyone explain what is going on? 

Tom 

Note this is also posted to alt.sys.pdp11
<http://groups.google.com/group/alt.sys.pdp11> 




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