Gregory's Serveroh yeah i was swapping out the Type 1 planar (16 MHz 386) for a Type 2 planar (20MHz 386).
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 weirdly enough, it booted to the setup disk just fine, but during automatic configuration, the screen goes blank and the whole thing locks up. from then on, any cold power cycle results in the error code 0F! i've pulled the battery again to clear whatever was loaded in there.  @tubetime What kind of packaging is that? I’ve never seen anything like it. @foobarsoft IBM's crazy odd MST modules (later versions of their SLT modules that they invented in the 1960s)  @tubetime Because of my unique personal history, my first thought was "I wonder if those were made in Burlington" (which was actually Essex Junction). @wollman see where it says "IBM 14" in the middle? the number there indicates the factory it was made in. apparently the code 29 indicated Essex, so this was a different factory. (see https://www.righto.com/2021/01/) https://www.twitch.tv/tubetimeus let's do some more board layout -- this time, i'm cloning an IBM PS/2 model 80 memory card (gee i wonder why) @tubetime Yet Another Weird IBM Package I guess. All part of its early days vertical integration and vendor lock in strategy? @EricCarroll IBM MST. based on an earlier tech they called SLT (solid logic technology) that they developed in the '60s. @tubetime I thought it looked like the SLT package from the IBM 1130 & 370 I had my hands on at one time. Never seen MST before. Thanks! |
well that works! this is the planar that had the cracked chip on it that I fixed (see the yellow labels in the previous photo).