Boot Loader for 3P+S on IMSAI

I have an IMSAI that I am restoring. The basics appear to be working (front panel, CPU and RAM cards). I have a Processor Tech, 3P+S card that is next on the list for testing. I have the manual, but the card was not configured for RS-232...not sure what it was configured for but it doesn't match anything in the manual. I plan to reconfigure it for RS-232. I'm trying to locate boot loader code for that board to allow serial uploading of files from a PC to the IMSAI? I have boot loader code for a 2SIO board on an Altair that I restored awhile back, and would like to find something similar for the 3P+S. I want to be able to toggle in a boot loader routine and then initiate an upload from the PC to IMSAI -- something similar to this https://www.youtube.com/watch?v=YwC1T9oLK1U&t=212s (at 1:10s in) but with a 3P+S board on an IMSAI. Also, a picture of your RS-232 configured card and wiring of the edge connectors would be helpful to make sure I get things right. Any help is appreciated. Thanks, Win wheagy at gmail.com?