Difference between revisions of "DEC alphabet"
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| − | '''DEC Alphabet''' is the name given to the cut-down alphabet used by [[DEC]] to number things such as the contact fingers on the edge of [[DEC edge connector contact identification|standard DEC cards]]. It runs: | + | '''DEC Alphabet''' is the name given to the cut-down alphabet used by [[DEC]] to number things such as the contact fingers on the edge of [[DEC edge connector contact identification|standard DEC cards]] (the first use). It runs: |
A,B,C,D,E,F,H,J,K,L,M,N,P,R,S,T,U,V | A,B,C,D,E,F,H,J,K,L,M,N,P,R,S,T,U,V | ||
| − | I.e. leaving out 'G', 'I', 'O' and 'Q', which when poorly printed might | + | I.e. leaving out 'G', 'I', 'O' and 'Q', which when poorly printed might be mistaken for '0', '1', etc. |
| − | be mistaken for '0', '1', etc. | ||
| − | It stops at 'V' because [[FLIP CHIP]]s, and later boards in that system, only had 18 contact pads on the edge fingers. With the later [[Berg connector]]s, which had 40 pins, it was extended to use 'W'-'Z' | + | It stops at 'V' because [[FLIP CHIP]]s, and later boards in that system, only had 18 contact pads on the edge fingers. With the later [[Berg connector]]s, which had 40 pins, it was extended to use 'W'-'Z' as well. |
Revision as of 04:08, 21 May 2018
DEC Alphabet is the name given to the cut-down alphabet used by DEC to number things such as the contact fingers on the edge of standard DEC cards (the first use). It runs:
A,B,C,D,E,F,H,J,K,L,M,N,P,R,S,T,U,V
I.e. leaving out 'G', 'I', 'O' and 'Q', which when poorly printed might be mistaken for '0', '1', etc.
It stops at 'V' because FLIP CHIPs, and later boards in that system, only had 18 contact pads on the edge fingers. With the later Berg connectors, which had 40 pins, it was extended to use 'W'-'Z' as well.
