Difference between revisions of "DEC alphabet"
From Computer History Wiki
m (Copy from WP) |
m (+Cat) |
||
| (3 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
| − | '''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 | + | '''DEC Alphabet''' is the name given to the cut-down alphabet used by [[Category:Digital Equipment Corporation|DEC]] to number things such as the [[DEC edge connector contact identification|contact fingers]] on the edge of [[DEC card form factor|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. | + | 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. |
| + | |||
| + | [[Category: Digital Equipment Corporation]] | ||
| + | [[Category: DEC Hardware]] | ||
Latest revision as of 14:42, 8 August 2023
DEC Alphabet is the name given to the cut-down alphabet used by 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.
