1. Forum
  2. Usenet
  3. COMP.SYS.IBM.PS2.HARDWARE

  • Auction: 70G8482 | IBM 32-bit VLB Fast SCSI-2 Adapter

    From Louis Ohland@21:1/5 to Louis Ohland on Thu Apr 20 05:43:18 2023
    https://www.ebay.com/itm/145011916993

    Hmm, I am "VL Curious" and "Questioning" the straight SCSI hierarchy
    that has confined me for years... No worries, I won't be on a Bud Light
    can anytime soon...

    Louis Ohland wrote:
    But for the cost of a pint of warm beer, we might have a better answer...

    I can remember the flash in the pan of VLB. Some implementations skimped
    on buffering, and weren't reliable.

    At some point, IBM would have evaluated it's efforts to support the
    various bus flavors. ISA. PCI. MCA. VLB. RS/6000. S390. And a whole
    buncha legacy big iron... Hell, AS/400...

    I did see an IBM boxed VL SCSI controller, dunno if it was IBM built or
    made for IBM. Lor, any comments?

    I have noticed the Model 56 "local bus" comes off the CPU, shares the
    SCS, and reaches the BIC. The Micro Channel is on the other side of the
    BIC [and buffered by the BIC].

    At this point, I am unaware of any IBM MCA system where the MCA feeds directly off the CPU bus. Think of the DMA logic, the arbitration, and
    other stuff [like memory controller].

    schimmi wrote:
    Hm, I thought, the Local Bus on a PS/2 _is_ MCA, like VLB or PCI on
    other machines. Do I miss something here? :)

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to Louis Ohland on Thu Apr 20 06:06:40 2023
    https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/4/897/ENUS194-234/index.html

    Hardware Requirements -- IBM Systems: The SCSI-2 VL-Bus Adapter
    (70G8482) is supported on all models of the following IBM platforms:

    Description Machine Type
    ValuePoint(TM) 6382, 6384, 6387, 6472, 6482, 6492

    Compatibility: This adapter is designed to be compatible with systems
    that conform to VL-Bus 1.0P and later.

    Note: Some configurations may not be compatible.

    Limitations: This adapter cannot be used in 16-bit VL-Bus systems due to
    32-bit block mode transfers with this adapter.

    A95-638 IBM INDUSTRIAL COMPUTER AND 7524 FEATURE ENHANCEMENTS https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/8/649/ENUSA95-638/index.html

    7585-001 and 7590-001

    https://www.ardent-tool.com/industrial/files/ref7585.html#7585-001
    Huh, flash update

    https://www.ardent-tool.com/industrial/files/ref7590.html
    More flashing.

    Louis Ohland wrote:
    https://www.ebay.com/itm/145011916993

    Hmm, I am "VL Curious" and "Questioning" the straight SCSI hierarchy
    that has confined me for years... No worries, I won't be on a Bud Light
    can anytime soon...

    Louis Ohland wrote:
    But for the cost of a pint of warm beer, we might have a better answer...

    I can remember the flash in the pan of VLB. Some implementations
    skimped on buffering, and weren't reliable.

    At some point, IBM would have evaluated it's efforts to support the
    various bus flavors. ISA. PCI. MCA. VLB. RS/6000. S390. And a whole
    buncha legacy big iron... Hell, AS/400...

    I did see an IBM boxed VL SCSI controller, dunno if it was IBM built
    or made for IBM. Lor, any comments?

    I have noticed the Model 56 "local bus" comes off the CPU, shares the
    SCS, and reaches the BIC. The Micro Channel is on the other side of
    the BIC [and buffered by the BIC].

    At this point, I am unaware of any IBM MCA system where the MCA feeds
    directly off the CPU bus. Think of the DMA logic, the arbitration, and
    other stuff [like memory controller].

    schimmi wrote:
    Hm, I thought, the Local Bus on a PS/2 _is_ MCA, like VLB or PCI on
    other machines. Do I miss something here? :)

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)