Boot Loader for 3P+S on IMSAI

william degnan billdegnan at
Tue Jan 10 12:26:50 CST 2017

On Tue, Jan 10, 2017 at 1:12 PM, Win Heagy <wheagy at> wrote:

> Took a little digging but I found the thread where you were talking
> about port 20/21.  I was able to configure the 3P+S card and run the
> test from the solivant site successfully, but I'm not able to upload
> basic.  I have a couple more things to try, including setting a small
> upload delay as Bill suggests on his page.
> However, I'm thinking that I may still have a configuration issue on
> the 3P+S card.  But I think I'm getting close.
> Win
> --

Did you verify "echo characters" works?  There is a test program in the
solivant site that explains this.  If so, then you very well may need to
experiment with character delays when you download BASIC.  You can watch
the lights and see when the various loaders load, that might help give you
a clue where the failure point is.

The extra pointers I added were things I found useful, but I was using the
2SIO card.


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