Yeah, think of it in terms of a collection of NMOS transistors. A bunch of mushy things all pushing on each other in a way that eventually makes a voltage into either high enough to be called a 1 or low enough to be called a 0. > (Personally, I find this little device a pretty brilliant one, > with/despite its simplicity, especially whenever I make an attempt to > build some of its functionality from TTLs ;-). Probably not much more > complicated in itself than a usual TTL bidirectional bus driver, yet > very efficient to use in practice. The only thing I'm missing is a > reset input (which probably wouldn't fit the DIP20 package)). Same here. Whenever I try to think of a replacement using only TTLs, it becomes a surprisingly complicated circuit if I want to emulate all funktionality from the datasheet. If you only want to replace the 6529 used for the keyboard in the 264 series, you _might_ be able to get away with a 374 (pinout adjusted). Luckily, the 6529 does seem to be pretty stable, so far I didn't have a broken one. Message was sent through the cbm-hackers mailing listReceived on 2013-09-08 21:00:08
Archive generated by hypermail 2.2.0.