Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!samsung!uunet!cbmvax!cbmehq!cbmger!danube!thiger!skraw From: skraw@thiger.UUCP (Stephan von Krawczynski) Newsgroups: comp.sys.amiga.hardware Subject: Re: GVP Impact II - Professional030 probs Message-ID: Date: 25 Jun 91 00:08:32 GMT References: <9106211453.21.145342@KARLUDO> Organization: THIndustries Software Development Lines: 37 In article rbabel@babylon.rmt.sub.org (Ralph Babel) writes: >In article <9106211453.21.145342@KARLUDO>, >karludo@insider.zer.sub.org writes: > >> My system consists of: Amiga 500, GVP Impact Series II >> A500-HD+ (LPS105), Professional 030 Board w/ 1Meg 32 bit >> RAM >> >> But with the RAM turned on ("addmem 900000 a00000") the >> data rate immediately drops to ~64kB/s! >> >> Without doubt this is because of the DMA-design of the >> hard disk, while the RAM-expansion being unable to perform >> DMA-accesses. > >According to Commodore's guidelines, RAM expansions located in >Zorro-II space ($00000000-$00FFFFFF) must be able to respond to >Zorro-II DMA. If the board mentioned above doesn't support DMA, >then it's *BROKEN*! Tell the manufacturer to fix it or at least >to move the memory into the address range $01000000-$FFFFFFFF. i had such a board quite a while ago and had some very bad experience with it. in fact its design is lousy (my personal opinion). it does not support dma, so i guess you will have to find some hack to move the address range anywhere above $01000000 (as ralph said). >> Kay-Uwe Drangmeister ...cbmehq!cbmger!insider!karludo > >Ralph -- best regards, stephan von krawczynski UUCP : ...!cbmvax!cbmehq!cbmger!danube!thiger!skraw PHONE: +49 9938 1664 FAX : +49 9938 1598