First post, by TimWolf
Working on this machine again, and moving the conversation to a new post as my original one was about the 287 options alone and this one is going to be about everything I'm doing. This machine contains a motherboard with surface mounted 286-12. Here is a link to the board on stason. I have also attached some pictures to this post.
https://stason.org/TULARC/pc/motherboards/L/L … 286-5500AT.html
Years ago I'd already upgraded the ram to 5mb the max the board will take, as well as adding a CF 256MB for the hard drive. I'm currently looking at upgrading the processor with a new SMD PLCC68 socket, a 50mhz crystal, a 286-25, and an i287-XL. I'm a bit uncertain if this will just drop in and work. There is a second crystal socket that is not populated. I know that the i287-XL was intended to be 12.5mhz but many have said it can be pushed further as it is really a 387. It is my understanding that the clock will either be half or 66% of the original, but I'm not sure with board. I'll be posting more as I work on this.
~TW