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Re: Help needed debugging the MS-DOS 3.3 boot process

This seems to cause the override: 0:08:51:39.7.0000: Read from memory: 000007B4=00 0:08:51:39.8.0000: Read from memory: 000007B5=01 0:08:51:39.8.0000: Writing to memory: 00002C9C=70 0:08:51:39.9.0000: Writing to memory: 00002C9D=00 0:08:51:39.9.0000: Writing to memory: 00002C9A=D8 0:08:51:40.0.0000: …

VGA 256 color blinking

What happens when the VGA's attribute controller has 8-bit pixels enabled with blinking turned on? Will the 4 bits that are latched be subjected to the 3-bit plus blink bit scheme before being latched together? So in that way: Value 0xED becomes 0xED or 0x65, depending on the current blink status of …

Re: Windows 95 full chip requirements?

The protection part is currently done in the MMU emulation. So the accesses to memory are already checked against the limits and the flags in the Page Table. The same with loads to segment registers. Exceptions won't work in protected mode yet, since they're using task switches (not implemented yet) …

Re: Windows 95 full chip requirements?

I already have the basic memory scheme of protected mode (addressing,paging and ModR/M) implemented. Only the interrupt handling and task switching are left to do atm. And of course the opcodes themselves once I get my 80(1)86 fully working. Of the reference manual I currently have implemented: ( …

Re: Windows 95 full chip requirements?

@Scali: I do have a 2nd interrupt controller and DMA controller emulated besides standard IBM PC hardware (atm just a 80(1)86 with 10MB RAM). So when I finish fixing the bugs in my 80(1)86 and add the upgrade to 286/386 (partially already written) I would be able to run Windows 95? Would 98/ME also …

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