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Thread: NCR53C400 vs NCR53C400A

  1. #1
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    Default NCR53C400 vs NCR53C400A

    Does anyone know the difference between NCR53C400 and NCR53C400A ?

    I have found NCR53C400 documentation (and removed all advertisement from this pdf)
    http://wiki.sensi.org/download/SCSI/ncr53c400_FREE.pdf
    It contains also a schematic for the "generic" controller (very similar to the Rancho RT1000B)
    AFAIK most of SCSI controllers are built around NCR53C400, not A.
    The NCR53C400A mainly was used for HP ScanJet ISA adapters С2502-66500.
    Since this board has 3(!) additional PALs to implement primitive Plug-n-Play
    it's common to consider NCR53c400A as PnP chip.

  2. #2
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    I've got the same manual (in paper) for the 53C400--it was used in a lot of inexpensive 8-bit controllers; some vendors took pains to get away from the memory-mapped structure (e.g. Trantor T130, which is I/O port accessed). All in all, it's a good match for the 8-bit ISA bus, but not terribly fast. TI had a nearly identical product used in the Seagate ST-01 controller.

    All in all, however, I think the 5380 was far more ubiquitous.

  3. #3
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    Additional letter sometimes adds new features for some chips. I.e. NCR53С90A has DMA engine:
    https://en.wikipedia.org/wiki/NCR_53C9x

  4. #4
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    I've just bought early HP SCSI ISA ScanJet card C1752-66500 based on the NCR53C400 w/o any PALs. It has "classic" memory-mapped architecture

    for comparison, the C2502-66500 card has 3 PALs and utilises NCR53C400A

    (mine in bad condition, sorry)

    There was an article at HP site, unfortunately they removed it
    http://h20564.www2.hp.com/hpsc/doc/p...docId=bps05132

    =====
    HP Scanjet - HP Scanjet Scanners and Symbios Logic SCSI Interface Cards

    ISSUE: Can the Symbios Logic SCSI interface cards (53C400A and 53C416) be used after upgrading the operating system from Windows 95 or Windows NT 4.0 to Windows 98, Windows Me, or Windows 2000 Professional?

    SOLUTION: The 53C400A Symbios Logic SCSI interface card is not supported in any operating system past Windows 95 or Windows NT 4.0. while the 53C416 interface card is supported in Windows 95, NT 4.0 and 98. However, it is possible to purchase a SCSI interface card that is compatible with current Microsoft (R) operating systems.

    DETAILS: The following HP Scanjet scanners came with Symbios Logic SCSI interface cards.

    NOTE: Some scanners were shipped with two different models of SCSI interface cards. This is reflected in the table below.

    Code:
    Scanner model                                                                    SCSI card chip set        SCSI card number
    IIC (C1750A), IIP (C1790A)                                                        Sym53C400                 C1752, C1752A
    IIP (C1790A), IIcx (C2500A), 3C (C2520A), 3P (C2570A), 4C (C2520B), 4P (C1130A)   Sym53C400A                C2502, C2502A
    4C (C2520B), 4P (C1130A), 6100C (C6260A)                                          Sym53C416                 Sym50401
    5P (C5110A)                                                                       Sym53C416                 Sym50403
    Any SCSI interface card compatible with the installed Windows operating system may be used.

  5. #5
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    I've got a tape of the 53C400 w/o A letter...


  6. #6
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    Very interesting 8-bit SCSI adapter built around NCR 53C400: Longshine LCS-6821N



    The BIOS is in the collection now:
    http://minuszerodegrees.net/rom/rom.htm
    under "L" letter

    ASPI drivers are on the old deutsch Longshine's site:
    http://manual.longshine.de/5_Old_Pro...ivers/CONTROL/

    TH99 jumpers
    https://th99.bl4ckb0x.de/c/I-L/20131.htm

    It's good candidate to clone, unfortunately BIOS does not support HDDs larger 512Mb

    I replaced this BIOS with Rancho RT-1000B 8.10 BIOS. It works in this controller well and support large disks.

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