Drobe :: The archives
About Drobe | Contact | RSS | Twitter | Tech docs | Downloads | BBC Micro

Reply to thread

simo - the chip may be different, but ADFS itself isn't. That's one of the many reasons why ADFS is so slow. The Risc PC can't, AFAICT, support DMA on its internal interface, which is unfortunate.

I've pointed this out before, but there are billions of things you can do to ADFS to bring it up to date, and DMA transfers is a big one on a system that supports them. Creating a filesystem which uses DMA is itself not too difficult.

Filecore is a major bottleneck too - you can't, for example, command cache correctly using filecore, and the way it currently does its sector requests is pretty inefficient when compared to ATA or SCSI specs.

But that's a MUCH meatier job. Anyone who plays with Filecore though is incredibly brave. Or stupid. Or both. After all, it's possible, but much trickier, to cause data corruption in ADFS. Trashing a hard disc by modifying filecore is no doubt easy-peasy :).

 is a RISC OS Usermd0u80c9 on 14/5/04 7:00PM
[ Reply | Permalink | Report ]

Please login before posting a comment. Use the form on the right to do so or create a free account.

Search the archives

Today's featured article

  • Of subnets and routers
    Part two of IP networking and RISC OS
     2 comments, latest by AMS on 7/9/04 8:11PM. Published: 7 Sep 2004

  • Random article

  • Exclusive: Artworks MasterWorks edition Wakefield 2001 launch

     Discuss this. Published: 18 May 2001

  • Useful links

    News and media:

    Top developers:
    RISCOS LtdRISC OS OpenMW SoftwareR-CompAdvantage SixVirtualAcorn

    CJE MicrosAPDLCastlea4X-AmpleLiquid SiliconWebmonster


    RISCOS.org.ukRISCOS.orgRISCOS.infoFilebaseChris Why's Acorn/RISC OS collectionNetSurf

    Non-RISC OS:
    The RegisterThe InquirerApple InsiderBBC NewsSky NewsGoogle Newsxkcddiodesign

    © 1999-2009 The Drobe Team. Some rights reserved, click here for more information
    Powered by MiniDrobeCMS, based on J4U | Statistics
    "The original entry in the guide described VA_RPC as ARMless, now it's been updated to Mostly Harmless"
    Page generated in 0.035 seconds.