RE: Slightly OT: Up/Down-Counter, easy interfaceable to 8-bit MPU

From: Davison, Lee (
Date: 2004-05-01 00:41:02

> At work, we need two 16-bit (binary) counters which can count up
> and down, depending on the state of a direction bit

74LS191 4 bit binary up/down counters. These can be cascaded to
form counters of any length and with the carry/borrow enable
scheme avoid the ripple effect seen in other long counter chains.

These were commonly used to address the up/down scrolling background
in arcade machines in the 80s.


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