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Tube❄️Time

looks like I need to get my system unit serviced. error 10400 is pretty generic.

15 comments
Tube❄️Time replied to Tube❄️Time

my guess is that it is the system board memory that has gone bad. funny coincidence, i'm designing a memory tester right now! however, i hadn't thought about putting in sockets for these little guys. can you even *get* sockets?

IBM memory board with weird little SLT metal can modules instead of regular chips.
Michael Cook replied to Tube❄️Time

@tubetime What kind of packaging is that? I’ve never seen anything like it.

Tube❄️Time replied to Michael

@foobarsoft IBM's crazy odd MST modules (later versions of their SLT modules that they invented in the 1960s)

Garrett Wollman replied to Tube❄️Time

@tubetime Because of my unique personal history, my first thought was "I wonder if those were made in Burlington" (which was actually Essex Junction).

Tube❄️Time replied to Garrett

@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 righto.com/2021/01/)

Tube❄️Time replied to Tube❄️Time

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)

Tube❄️Time replied to Tube❄️Time

some folks are wondering what those metal cans are in the other post. here's a handy reference chart from IBM that shows modules with the lids removed.

SLT: ceramic slab with discrete diodes/transistors
ASLT: two stacked ceramic slabs
SLD: solid logic dense; just more parts crammed on a single slab
MST: ceramic slab with one or more IC die flipped over and soldered down with solder bumps.
Eric Carroll replied to Tube❄️Time

@tubetime
What the heck is that metal can style package?

Yet Another Weird IBM Package I guess. All part of its early days vertical integration and vendor lock in strategy?

Tube❄️Time replied to Eric

@EricCarroll IBM MST. based on an earlier tech they called SLT (solid logic technology) that they developed in the '60s.

Eric Carroll replied to Tube❄️Time

@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!

Chuck replied to Tube❄️Time

@tubetime Quick, call IBM Field Service! Oh wait ...

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