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  • Re: "Write Buffer" for the 370/168

    From MitchAlsup@user5857@newsgrouper.org.invalid to alt.folklore.computers,comp.arch on Wed Nov 12 20:38:14 2025
    From Newsgroup: comp.arch


    Al Kossow <aek@bitsavers.org> posted:

    On 10/16/25 4:51 AM, James Dow Allen wrote:

    The add-on memory company I worked for was in a hurry to develop
    memory for the 370/168.

    I have some micocode floppy images at http://bitsavers.org/bits/IBM/Microcode_Floppies
    but no one has ever told me very much about them or if
    they would be useful for 370 emulation at the microcode
    level. Apparently the later models had service processors
    that you would IML that was attached to the floppy drive.


    I took a look at some of the data--it is all in binary,
    so, the only way it helps you to do 370 emulation is if
    you already have a 370 bit-accurate emulator.

    Otherwise, it just historical artifacts.
    --- Synchronet 3.21a-Linux NewsLink 1.2
  • From Al Kossow@aek@bitsavers.org to alt.folklore.computers,comp.arch on Wed Nov 12 13:16:31 2025
    From Newsgroup: comp.arch

    On 11/12/25 12:38 PM, MitchAlsup wrote:

    I took a look at some of the data--it is all in binary,
    so, the only way it helps you to do 370 emulation is if
    you already have a 370 bit-accurate emulator.

    My question was if this was code that ran on the service processor.
    I wouldn't expect IML code to be anything other than binary.
    --- Synchronet 3.21a-Linux NewsLink 1.2
  • From MitchAlsup@user5857@newsgrouper.org.invalid to alt.folklore.computers,comp.arch on Wed Nov 12 22:55:28 2025
    From Newsgroup: comp.arch


    Al Kossow <aek@bitsavers.org> posted:

    On 11/12/25 12:38 PM, MitchAlsup wrote:

    I took a look at some of the data--it is all in binary,
    so, the only way it helps you to do 370 emulation is if
    you already have a 370 bit-accurate emulator.

    My question was if this was code that ran on the service processor.
    I wouldn't expect IML code to be anything other than binary.

    The data set is big enough to be main microcode.
    --- Synchronet 3.21a-Linux NewsLink 1.2