Article 54064 of comp.sys.cbm: Xref: undergrad.math.uwaterloo.ca comp.sys.cbm:54064 Newsgroups: comp.sys.cbm Path: undergrad.math.uwaterloo.ca!csbruce From: csbruce@ccnga.uwaterloo.ca (Craig Bruce) Subject: Re: WORLD PREMIERE OF CMD'S SUPER64CPU Sender: news@undergrad.math.uwaterloo.ca (news spool owner) Message-ID: Date: Fri, 17 May 1996 20:03:18 GMT References: <319a840e.306097@news.gnn.com> <4nelfi$6e2@news.bridge.net> Nntp-Posting-Host: ccnga.uwaterloo.ca Organization: University of Waterloo, Canada (eh!) Al Anger wrote: >Jim Stephenson (Stephenson@gnn.com) wrote: >> Talk to me about this ... is it ACE compatible? Does anything else (other >> than custom software) have the ability to make use of it? > >Yes, it is ACE compatible, and no, only custom software can address the memory. >It's very easy to do... ACE supports up to 512K of expanded internal memory. It uses MMU register $d500 to select RAM banks 0-3 and MMU register $d506 to select what should whether physical banks 2/3, 4/5, or 6/7 should appear in logical bank slots 2 and 3. The hardware hack is from in TwinCities-128 magazine. Any internal memory expansion that uses this interface (especially banks 0-3) will work with ACE. My own C128 has 256K of internal memory, so I know that that much works perfectly. This is all clearly shown in the system source file "ace15-syssrc.kar" in lines 3364--3500. :-) (Hey, there are only 18,060 lines of code to the ACE system (and 28,003 lines of application code)). Keep on Hackin'! -Craig Bruce csbruce@ccnga.uwaterloo.ca "You'll see it when you believe it." --zinger C=256,64K-VDC,REU,RL16,HD200,FD4000,SL,USR28.8,C=128,1581,1571,C=64C,1541,VIC20