[rescue] [OT] S: IBM /370 or /390 card

[Clem Cole]

Remember IBM and Moto were pretty thick over the years.  Moto created MECL
(Motorola ECL for IBM for System 360) in the mid-1960s.

On Tue, Sep 12, 2023 at 4:11 PM Dave McGuire via rescue <rescue at sunhelp.org>
wrote:

>
>    Since the 68K's control store is in mask ROM on the chip, I think that
> would be a challenge.
>
IBM licensed it, and the same person wrote the ucode for both chips, Nick
Tredennick
<https://streaklinks.com/BqH_EOyXl14e_YW88g2ki55r/https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FNick_Tredennick>
  [awesome guy, BTW].

After he had moved to IBM ("Jerktown" as he called it), Nick and the IBM
team later relaid out the chip t create the u370:

[image: 2023-09-12 17.49.25.jpeg]

When I was a grad student @ UCB (where he was giving away thew above swag),
Nick said that IBM had two metal layers in their process which was why it
was faster that original 68000.  IIRC Moto got the IBM process for the
68020 and I >>think<< they used a common process for the PPC.


ᐧ
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