Hi superfury, May I ask what software you use to report the MIPS? For my own emulator (when set in 8086 mode) I used CheckIt and TOPBENCH (which says Score 154, Pentium @ 75Mhz). To answer to your question I use function pointers for all instruction decoders. Regards, Vlad.

I do not think he is emulating a 5150 but rather a 5160 (XT) hence he needs the port 63 to convey number of floppy disks. Basically you have to be careful what your BIOS is expecting: IBM PC vs IBM PC XT vs IBM PC AT, as they all report floppies differently. Vlad.

I am confused about this: >> In this case, the current SPCM binaries are a hex-edited and resource-edited version of the PCem binaries, You mean you are not compiling it from sources? Will you be providing sources to SPCM? How different is SPCM from PCem? Regards, Vlad.

Hi, I do not actually know a direct answer to your question (I apologize) but the 8086/80186 computers did not have PCI controllers. Now that might not be an issue in the emulator but I assume doing anything PCI controller related just opens a lot of cans of worms that you might not want to deal …

A 386SX won't be able to do a 32bit transfer with an IN EAX, DX though, it will either be a 16+16 or 4x8. I do wonder though, does it still wait for the memory/bus to fail or does it do it properly from the start? Vlad.

You need to notice wich advantages compared to the existing emulators you plan to make. Or it's hard to understand what is it for. Oh in order of importance to me: a) mainly for fun and as a challenge. b) I want it to be used as a debugging tool for "old DOS" code. That is why I am providing a …

For those I provide links on the website to where people can get them. This way I won't be storing an out of date version. I do not mind distributing Turbo XT BIOS. For example the Bochs BIOS (and the Plex VGA one too) I use a lot in testing when I "build" a 386 in the emulator, but they are easy to …

I just tried "Alley Cat" in my emulator and seems to work fine in both native CGA mode (using a CGA adapter) as well as CGA mode on VGA (using VGA adapter). If you want to see what I do check devices/device_vga.cpp and look for functions: graphicsModeScanline16LoRes and graphicsModeScanline16HiRes: …

Hi, I have been working on this emulator for a while now. It is not complete and I am still working on it and perfecting it. I was inspired by PCEm so I wanted to create something as modular as that, where you can virtually build a computer from individual parts: CPU, NPU, memory, type, videocard, …