You’ve seen the Intel “Powerpack“ unboxing (or if not, watch it) with a 386SX-20MHz upgrade for 286 CPU-based systems that Intel called the “SnapIn 386“ - These are the Kingston “386 Now!“ upgrades that are even better performance increases and an ability to also have a 387SX/387SL Floating-Point Unit (FPU). All the details are at the go-to Ardent-Tool website at - and you can go to the original page that ’uxwbill’ did.
The (“CSIPH“) newsgroup:
The PS/2 Facebook group: