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Re: Best emulator for 2D football game

UniPCemu can handle Pentium II with accurate CPU(without FPU/MMX though), 2D acceleration(ET4000/W32 with actual CRT emulation(no physical effects though, other than raster emulation for any video mode you can program (using x/y precalcs, think like a rails where a precompiled 'program' for …

UniPCemu's server build user thoughts?

Anyone out there using the UniPCemu server builds? And of course I want to know your thoughts on it. It supports various protocols to be used with (the most simple of them being PPP and SLIP). It also supports IP addresses, but might require Gratuitous ARP to be supported on the modem to be properly …

Re: Stresstesting RAM throughput in emulators?

Managed to stress it more by fixing some issues with it. Now it's down to 17%. Although Windows 9x/NT does a better jpb somehow(lowering it to 7% and 14% sometimes)? Oddly enough, even though RAM accesses are more optimized in the profiler, throughput seems lower in total? If you look at UniPCemu's …

Stresstesting RAM throughput in emulators?

I've created a little BIOS ROM program myself (can be found in UniPCemu's git repository, at UniPCemu/assembly/testRAMthroughput.asm, compiled with nasm on Windows in my case). It essentially keeps executing a MOVSD instruction at unaligned addresses (starting at offset 1) in a loop. But the loop …

Re: Windows NTFS 4GB partition on i440fx?

Hmmm... Decoding the data in the VBR gives me the following information: Bytes/sector: 512 Sectors/cluster: 1 Volume reserved sectors: 63 sectors Volume start (calculated): 63(reserved sectors)=Sector 63 MFT start: cluster 318A3h MFT sector start: 318A3=318A3. MFT table start=631c400h=((318A3h(start …

Re: DOS Games crash under Windows 95

Well, if you look up a diagram of the Windows 9x architecture, you'll see why the MS-DOS game crashes under Windows. It's trying to do kernel mode (ring 0 only is allowed to do that) privilleged stuff while running as a MS-DOS app in ring 3(user mode). The processor forbids that use case, thus …

Re: DOS Games crash under Windows 95

It looks like it's trying to run in protected mode (32-bit) while Windows is running. Normally, Windows doesn't allow the second memory manager to access Windows' protected register(CR0), which would break Windows if it did. The only option is to run in barebones MS-DOS in such a case. It's trying …

Re: Windows NTFS 4GB partition on i440fx?

1. Try another BIOS, the one you are using may have IDE translation bugs. 2. Windows NT 4.0's setup creates a FAT16 partition to the target size you want before converting to NTFS. Given that FAT16 has a maximum size of 4GB (64k clusters are supported on NT), you may be bouncing off the limit. I …

Re: Windows NTFS 4GB partition on i440fx?

Hmmm... The boot loader crashes at 0D00:0510, trying to access DS(0D00):EAX+C, where EAX=8888xxxxh. So the 8888 part causes a #GP fault in real mode because it's out of range of the 16-bit address range of the DS segment descriptor cache (which has a limit of 64KB).

Re: Windows NTFS 4GB partition on i440fx?

OK. After comparing the boot record between the FAT(first part of setup) and NTFS(after the first boot converting it and then failing to boot it again), I see two bytes different in the MBR. This changes the number of sectors in the parition (but leaves CHS unaffected) from 7FFFA1h to 6001A1h ( …

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