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Thread: Best performing storage option for a 286 Machine

  1. #41

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    Quote Originally Posted by maxtherabbit View Post
    Question for those familiar with the XT-IDE boot ROM:

    Right now this old Adaptec BIOS will not allow more than 2 HDD total in the system. I.e. if you configure Drive C in the system CMOS Setup it will initialize one SCSI drive as D. If you configure Drive C and D in the system CMOS Setup it will print a message saying Drive C and D already installed and do nothing.
    That is similar to how some old MFM controller BIOSes behaves. If 2 or more drives are already installed they will refuse to install their own drives. So that's why MODULE_MFM_COMPATIBILITY was added to XUB. This module is not in the official builds so a custom build is required (let me know if you need help with this). Also, this additional code has not been tested (at all AFAIK) - it was added for the very few people that wanted to run old MFM drives together with IDE (yes, I'm looking at you Alecv ).

    If I were to set the system CMOS to no hard drives, and use the XTIDE ROM instead, would I be able to have the Adaptec configure C and D as SCSI drives and then have the XTIDE ROM configure an IDE drive as drive E, as long as it loaded after the boot ROM on the SCSI controller?
    Maybe, at least there's a chance if using MODULE_MFM_COMPATIBILITY.
    Quote Originally Posted by maxtherabbit View Post
    So does the XTIDE ROM play nice with other disk ROMs and 3+ drives?
    Yes, usually. It mostly depends on the other BIOS.
    Looking for a cache card for the "ICL ErgoPRO C4/66d V"

  2. #42
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    The cheapest fast solutionh is a 16 Bit ISA IDE adapter, IDE to CF/SD adapter and a CF or SD card. They will reach maximum of the IDE bus speed of that machine and there is no seek time for mechanical heads to reach the requested track/sector. You can leave also the SCSI adapter in for larger drives for data storage and not so performance needing applications.

  3. #43
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    On most IDE drives, seeking short distances is usually swamped out by rotational latency. i.e. a typical 3600 RPM drive has an average rotational latency of 30 msec. I think that characterizing latency as being solely due to seeking is a bit misleading.

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