LChackr wrote on 2023-09-05, 21:13:
UPDATE: It boots if I disable the internal 486DLC cache. 🤦♂️
I guess I need to report a bug?
Maybe. 🤷♂️
I assume it somehow has to do with DMA and the caching of certain memory regions.
Floppy i/o uses DMA controller.
Thing is, there are several ways of controlling (flushing) the 486DLC cache on a 386 motherboard.
Some motherboards are 486DLC aware, even have support in chipset and BIOS.
They don't need a DOS utility to activate the 486DLC cache.
On the other hand, those are likely 486 era chipsets and support a real 486, as well,
so there's not much of a reason to use them with a 486DLC amd not a full 486.
By contrast, vintage 386 motherboards can be given new life by installing a 386DX40 or a 486DLC.
And those usually require certain hacks to make the 486DLC cache work.
Anyway, I'm just a layman here.
Maybe there are certain settings to try or alternate 486DLC DOS utilities that will fix the issue? 🤷♂️
Edit: As a workaround, you could try to not enable 486DLC cache in BIOS and instead use a DOS utility.
It's no real solution to the issue, of course, but the right DOS utility may support the same method of cache control as BIOS.
If the chipset/socket has the appropriate control lines, I mean. The official Cyrix utilities are maybe a good start.
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