80286 Protected Mode Test

On 3/6/2021 3:10 PM, Sean Conner via cctalk wrote: The 286 can exit protected mode with the LOADALL instruction. Microsoft's extended memory driver pissed off the world (Intel) when someone noticed it was addressing +1mb memory with no hint of the reset.? The rest of the world used a driver and memory buffer algorithm which optimized accessing > 1mb because of the horrible latency involved in what you are describing. Another client and some friends I had were caught with their s**t stinking because they'd used it in their bios (Micro5 systems). I suspect there's some sort of failure involved like that, but not sure how it could live to print the message in the case of going into protected mode but not getting back out. As far as a defective 80286 I can't imagine it passing a lot of the bios test code at all if it was internally damaged. Any POST card (port 80) handy?? Maybe some hints there? thanks Jim