stever@videovax.UUCP (02/14/87)
In article <7@ethz.UUCP>, Claudio Nieder (claudio@ethz.UUCP) writes: > . . . > According to the AGNUS PIN ASSIGNMENT printed on page C-2 of the Amiga > Hardware Reference Manual Agnus has two VSS pins (27,41). Is there > really no way to use one of these to add an additional address line ? High-speed logic needs solid grounding to avoid all sorts of problems. An example of this is the 68020 processor, which has *13* ground pins (and 9 Vcc pins)! If you are switching eight or ten outputs (to say nothing of 64+), the inductance of the ground pin and the lead inside the package can develop more than a volt drop during output transitions. This kind of voltage drop across the "ground" raises havoc with logic! Agnus undoubtedly needs both those grounds. . . Steve Rice ---------------------------------------------------------------------------- {decvax | hplabs | ihnp4 | uw-beaver}!tektronix!videovax!stever