I'm looking for a three-state inverting octal buffer for a replacement part for an old microprocessor lab. The package should be DIP. Ucc should be on pin 20. Chip select should be at pins 1 and 19 and active on low, so that the buffer is in high impedance state unless both enables are low. The input/output ports should be next to each other with even pins as input and odd as output. What this would be in practice is a 74540 IC with the described pin configuration or a 74366 with 20 pins. Help would be appreciated.
Wow. Can't even buy an old buffer in DIP any longer. :( I didn't check, but maybe some type of programmable logic chip will do it (e.g. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=428-1278-ND)
update: possibly eaby