K12MIT on PDP-12

Chris Zach cz at alembic.crystel.com
Wed Nov 24 03:55:19 CST 2021

Do you have a running pdp12?


On 11/24/2021 4:47 AM, Christian Corti via cctalk wrote:
> So, with the help of you here, I was able to create OS/8 LINCtapes and 
> to run SerialDisk. Everything runs very fine.
> Now comes the next thing: I want to have K12MIT, and it is no problem to 
> compile or load the program.
> *But*: When I start K12MIT I don't get the prompt. I see the welcome 
> message, and it correctly identifies the machine as a PDP-12, but that's 
> it. As I've found out it apparently overwrites its code, the processor 
> is looping around address 3600-3620. Examining the memory reveals that 
> the code at 3600 has been overwritten with junk. So it's clear that it 
> won't run anymore. What happens? Was anyone else able to run K12MIT on a 
> PDP-12?
> BTW the same binary runs fine on a PDP-8, be it a real machine or SIMH.
> Christian

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