640KB

I have looked into it in the past for sure, and something that would be really neat to do some day. There is a decent amount of additional code needed...

> I know this is closed but I just want to add my thoughts. > > I'm working (slowly) towards 286 and AT support in VirtualXT. Just as you noted...

> My friend uses GLaBIOS with his IBM 5150, which he has a 10mhz 286 accelerator card, it seems to work quite well, he showed me it yesterday. However, I...

> Perhaps you already know about the [ATBIOS Kit](https://archive.org/details/ATBIOS_Kit_Nov89)? If not, then perhaps it can be of use in the future. ;) Oh, that's very interesting. I've never seen this...

Yes, the speed is hot-key switchable during run time with the ctrl-alt-+ key stroke, which toggles between the default speed of 9.54MHz, 4 RAM WS and 7.15 MHz, 0 RAM...

That's interesting. Perhaps the PT8010AF has slightly different speed register settings. How does it work on the micro_8088 BIOS?

I just looked back at the code and toggling between highest and lowest (4.77) was what I intended (I just forgot that's how it worked). I'll look into what it...

Thanks for giving it a try! I don't actually own one and haven't actually had many testers yet (I think just one early on). I'm tempted now on the book...

> I'm tempted now on the book 8088 to simply skip those tests (for now at least) since we can be fairly confident the KBC should be working. Well, it...

> Yes, ISA card from https://www.tindie.com/products/spark2k06/rtc-isa-8-bits-very-low-profile-2/ mapped to port 70h. I stacked a few 28pin dip sockets and added a zif socket in my book8088 so I can easily swap...