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My Master Project... a virtual operating environment

PnP Bios · 2004-06-10T13:41:56

As a summer project, I am going to try to create my own gaming system, or atleast an emulator for it. I''ve done assembly before, x86, and a little z80. I figure that doing this would be a great way to learn a little more, and use what I already know. here is how it would work. I would premap out the memory, and allocate enough for a decent sized program. the orginization would look something like this. [u]address, descritption:[/u] 00000000-000000FF: The stack 00000100-00000FFF: Registers 00001000-0000FFFF: Instruction Segment 00010000-000FFFFF: Video Memory ...: don''t know(misc device memory) 10000000-FFFFFFFF: Free Memory It would go something like that. It''s going to be a learning experience, thats all I can say. Perhaps I will write a console emulator after I get this working. who knows... anybody do anything like this? any advice? I don''t think this is too ambitous, just a little diferent from most peoples projects. wish me luck, atleast.

General and Gameplay Programming Programming

Started by PnP Bios June 08, 2004 08:32 PM

12 comments, last by PnP Bios 19 years, 10 months ago

DukeAtreides076

602

June 09, 2004 11:02 PM

You can probably save yourself the trouble of having separate instructions if you just have a flag in the instruction specifying immediate values or memory. Read up in the Intel IA-32 manual, volume two, (chapter two?) on the instruction format. x86 uses flags coded in the instruction itself (mod r/m byte, SIB) to distinguish between registers, memory, and immediate values. You can probably design something similar to that.

PnP Bios

494

Author

June 09, 2004 11:16 PM

Duke, do you mean like instruction 1000123A and 1000123B would be the same instruction, just handling the operation different? or am I way off base?

HxRender | Cornerstone SDL TutorialsCurrently picking on: Hedos, Programmer One

PnP Bios

494

Author

June 09, 2004 11:21 PM

hmmmmmm
got distracted while looking for IA-32. Bochs. hmmm.

HxRender | Cornerstone SDL TutorialsCurrently picking on: Hedos, Programmer One

DukeAtreides076

602

June 10, 2004 01:41 PM

quote:Original post by PnP Bios
Duke, do you mean like instruction 1000123A and 1000123B would be the same instruction, just handling the operation different? or am I way off base?

Exactly. They can have the same mnemonic, but the assembler or compiler decides which way to code the instruction to hex based on the operands. Just like you can use the MOV instruction with a register/memory/immediate value. The assembler decides what kind of data youre using and codes the instruction appropriately.

I used to use Bochs during my OS development days. Its pretty useful. You can play old dos games on it too

My Master Project... a virtual operating environment

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