A-5 X2 CODER 100-101115
N L J H F D C B A
G R R R R T T T T
r e e e e P P P P
n d d d d
The X2A code is a shift register with the following equation:
1 + X1 + X3 + X4 + X5 + X7 + X8 + X9 + X10 + X11 + X12The X2B code is a shift register with the following equation:
1 + X1 + X3 + X4 + X8 + X9 + X12Where the exponents are the tap locations that are combined in an or gate and fed back to the input.
The X2 code is formed by the MOD 2 combination of X2A and X2B (i.e. a Gold Code).
I would expect to find a couple of 12 bit shift registers on this board with each bit's output brought out to a pin and some big OR gates and an external or gate to sum the codes.
Beckman 899-1-R270 | F 93S47PC | blank | blank |
AM25LS194PC | 93S48 PC | F 74LS32PC | blank |
AM25LS194APC | F 93S47PC | TI SN74LS123N | blank |
AM25LS194APC | F 93S47PC | header rcrcrcrc | blank |
AM25LS194APC | 93S48PC | TI SN74LS123N | TI SN74ls86n |
AM25LS194APC | f 93s47PC | AM25LS163PC | AM25LS151PC |
AM25LS194APC | bECKMAN 899-1-r1K | AM25LS163PC | AM25LS164PC |
076-200089 prom? | AM25LS09PC | AM25LS163PC | balnk |
AM25LS08APC | TI SN74128N | DM74LS37N | electrol cap |