7 Apr
2005
7 Apr
'05
12:50 p.m.
Would someone happen to have a 1970s-era Signetics TTL handbook in which they could look
up some details about the N8266?
I know that it is a quad 2-input multiplexor/selector and I know what the pinout is.
The questions are:
- what is the specific logic functioning of the 2 control inputs?
- is there any inversion in the data path(s)?
From the cross-references I have the 8266 doesn't
seem to have made the transition to a 7400 series standard, probably because it's
functioning is a little weird.
They are used in a Wang 520 calculator with the control lines operated in two different
manners. While the intent of the circuitry would seem apparent, the two uses of the
control lines are somewhat idiosyncratic to each other.
(FWIW: the 520 is circa 1972, TTL logic, micro-program architecture, core rope
micro-program store.)