IBM 5110 (5100) schematics ?

Christian Corti cc at
Fri Mar 18 03:31:12 CDT 2022

On Thu, 17 Mar 2022, Brent Hilpert wrote:
> Does anyone have or know whether the schematics for the IBM 5110 or 5100 
> are available?

No, there are no schematics, only block diagrams. I had created the 
schematics for the Async/Serial I/O card years ago (it's a TTL only board)

> And the tightly related question of whether anyone has done ROM (ROS) 
> dumps?

Yes. I've described the procedure a couple of times in the past ;-)
And FYI, I have also written a 5110 emulator. And I also have reverse 
engineered the opcodes (at a time where the 5100 MIM was not available 
Everything (ROS listings, dumps, emulator etc) is on our FTP server as 
usual. You'll also find my Kermit program and Infocom interpreter 
there, both written in PALM assembler.


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