Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!rutgers!im4u!milano!baxter From: baxter@milano.UUCP Newsgroups: comp.sys.m6809 Subject: Re: 512K RAM upgrades Message-ID: <5047@milano.UUCP> Date: Mon, 10-Aug-87 10:31:39 EDT Article-I.D.: milano.5047 Posted: Mon Aug 10 10:31:39 1987 Date-Received: Tue, 11-Aug-87 03:37:26 EDT References: <5013@milano.UUCP> <1109@wlbr.EATON.COM> Sender: baxter@milano.UUCP Organization: MCC, Austin, TX Lines: 33 Keywords: OS9 CACHE SDOS Summary: A few more answers about the cache... In article <1109@wlbr.EATON.COM>, pete@wlbr.EATON.COM (Pete Lyall) writes: > > Are there any probabilities that this will be ported over to OS9-dom? Not in the short term. > ... The DMC > controller is allegedly also barking up that tree, but with > considerably smaller cache area (~8K). SDOS has always had a cache of 2-4Kb. It works reasonably well, but isn't anywhere the performance of the big cache we have been talking about. > How do you time stamp your LRU/MRU sectors?? Do you keep a separate > data structure aside for disk/LSN/TIME, and update with a 6 byte time > packet? Do you keep this list sorted? TIME STAMP? That's crazy. All you need is a relative time ordering, which a linked list does beautifully. > Also - what *is* the scoop on SDOS...? Available later on the CC3? > What platforms support it now? SDOS is available on CoCo2 standalone, CoCo2 with extended memory card (but a CoCo3 is cheaper than the pair), and sometime later on CC3. There are versions which run on SSB Cheiftans/VARs and EXORbus equipment, as well as several you-never-heard-ofs. > Also - nice touch on the floppy I/O.. care to brag about your > technique (nudge.. nudge..)? No. -- -- Ira Baxter Microelectronics and Computer Technology Corporation / STP (512) 338-3795 3500 West Balcones Center Drive, Austin, Texas 78759