Re: I'm looking at the files being journaled . . . .

The straddle part comes from the APIs used to connect IBM i to the LIC. Without them nothing above the virtualization layer would be useful.

When you sign onto DST/SST you are using that to work on the actual hardware and that’s part of the API layer IBM provides.

When loading IBM i you first use those interfaces to prep the hardware (primarily storage) to create the load source drive where you can load the LIC and then IBM i.

It’s part of Mr. Soltis’s genius.


Jim Oberholtzer
Agile Technology Architects

On Feb 7, 2025, at 12:02 PM, Vern Hamberg via MIDRANGE-L <midrange-l@xxxxxxxxxxxxxxxxxx> wrote:

Hi Jim

I hope what I'll say lines up with you - I borrowed a simple image from an IBM web page or presentation that puts i5/OS above the TIMI, along with user applications. SLIC or System Licensed Internal Code is just below the TIMI, and below that is the hardware technology - hardware technology does change, and SLIC (at least in the simplest terms) is the thing that is changed, while the TIMI gives us a consistent interface, so we don't need to worry about low-level changes.

You use the word "straddle", which gives me a somewhat different way to look at these components or layers.

*Regards*

*Vern Hamberg*

<cid:part1.396FUQnj.Ze0Ak2r7@centurylink.net>

On 2/7/2025 11:26 AM, Jim Oberholtzer wrote:
Additionally if one were to get really picky (as pointed out by Frank Soltis in a COMMON presentation) the OS is really the LIC which straddles the virtualization layer (TIMI) between hardware and the software just above it. IBM i is the human interface and a large group of applications that live above that.

Too deep in the weeds for most except true computer scientists.

TIMI = Technology Independent Machine Interface.


Jim Oberholtzer
Agile Technology Architects

On Feb 7, 2025, at 10:59 AM, Patrik Schindler<poc@xxxxxxxxxx> wrote:

Hello Jim,

Am 07.02.2025 um 17:09 schrieb Jim Oberholtzer<midrangel@xxxxxxxxxxxxxxxxx>:

Actually it's two steps.

LIC load (C200xxxx to C600xxxx) level would equate to IMPL
C900xxxx would imply IPL (Initial Program Load) for the IBM i system.

You are correct, they tend to get lumped together as IPL. (Just being
picky about terminology)

Thanks for explaining. I can't remember to have read the term IMPL until this very day.

:wq! PoC


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