[Techtoolslist] Fwd: 7408 vs 74LS08

[Jose Luiz Martins]

Hi !

Have you guys experience problems using 74LSXX instead of 74XX in address
bus?

I'm trying to troubleshoot one Taito Moon Cresta board for months, and
could not find the problem.

I solve the garbage on the screen changing one 7408 at Data Line A5,A6 and
A7 but now I have the screen filled with Zeroes and Ones.

I was noticed by a friend that the 2114 is very speed sensitive, but I cant
believe the 74LS08 is the guilty.

I'm asking you guys because I don't have any good 7408 IC,  I'll have to
order it from USA and wait about 30 days to arrive.


Thanks