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From: stever@videovax.UUCP
Newsgroups: comp.sys.amiga
Subject: More address lines on agnes!
Message-ID: <4218@videovax.Tek.COM>
Date: Tue, 10-Feb-87 12:25:07 EST
Article-I.D.: videovax.4218
Posted: Tue Feb 10 12:25:07 1987
Date-Received: Sat, 14-Feb-87 01:41:15 EST
References: <2438@jade.BERKELEY.EDU> <1375@cbmvax.cbmvax.cbm.UUCP>
Reply-To: stever@videovax.Tek.COM (Steven E. Rice, P.E.)
Organization: Tektronix Television Systems, Beaverton, Oregon
Lines: 17

In article <1375@cbmvax.cbmvax.cbm.UUCP>, George Robbins (grr@cbmvax.UUCP)
writes:

> . . .

> The real problem with making any new custom chips that address more chip
> memory is that there aren't enough pins on the 48-pin agnus chip to add
> another address line!  . . .

The usual solution to this problem is to multiplex power and ground!  This
frees up a pin that can be used for an additional (multiplexed) address
line, thus allowing 2 meg to be addressed [ 8^) ]. . .

					Steve Rice

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