This is the 16 bit real mode MikeOS translated to run as 32 bit protected mode.

Hey,

can you Zip all files together so that i can download it?
sry, i am German

Edit: thank you

ty

Thank you Mike, well done.

I like MikeOS, did a translation of MikeOS Basic to DexOS. I hadn't thought about the idea of making a 32 or 64 bit ver of MikeOS. Taking a quick look at the source and your line "aeBIOS - case study - MikeOS" this only runs after you start aeBIOS, right?

Here is the latest version of MikeOS32 (and the latest version of aeBIOS)

Mike Gonta wrote:

Mike Gonta look and see - many look but few see http://mikegonta.com

How true! I looked at your website but couldn't see anything

Quote:

look and see --- many look but few see

Nice one - you should add a "if you can read this you don't need prescription glasses"
but what are TWOTHBRUSHES??

If this is really Protected Mode then I think that you could access more than 64K of memory right?

sid123 wrote:

If this is really Protected Mode ...

That's very simple to verify.

Code:

use32 ; PM32 org 0x400000 ; MikeOS32 loads apps to 4Mb times 0x80000 db 0x90 ; NOP - file size at least 1/2 Mb   mov esi, hello ; 32 bit registers   call print   mov ah, 0x10   int 0x16 ; standard BIOS functions   ret print:   mov ah, 0x0E .1:   mov al, [esi]   lea esi, [esi+1]   test al, al   je .2   int 0x10   jmp .1 .2:   ret hello: db "This is a big app!", 0

Assemble this as big_app.bin, copy to the root directory, boot MikeOS32, select it from the menu and press any key to go back to MikeOS32.

Mike Gonta wrote:

sid123 wrote: If this is really Protected Mode ... That's very simple to verify. Code: use32 ; PM32 org 0x400000 ; MikeOS32 loads apps to 4Mb times 0x80000 db 0x90 ; NOP - file size at least 1/2 Mb   mov esi, hello ; 32 bit registers   call print   mov ah, 0x10   int 0x16 ; standard BIOS functions   ret print:   mov ah, 0x0E .1:   mov al, [esi]   lea esi, [esi+1]   test al, al   je .2   int 0x10   jmp .1 .2:   ret hello: db "This is a big app!", 0 Assemble this as big_app.bin, copy to the root directory, boot MikeOS32, select it from the menu and press any key to go back to MikeOS32.

AWESOME!
That's great Mike Gonta
As Mike Saunders made MikeOS-16
Mike Gonta takes it to 32....

I have a question about the bootloader. How does it look for the file? It first looks in the root directory and then reads the FAT?

I'm not sure if I understand correctly how this works.

Any help is greatly appreciated

z0q wrote:

I have a question about the bootloader. How does it look for the file? It first looks in the root directory and then reads the FAT?

The file name is found by checking each root directory entry in the root directory table one entry at a time. That
root entry contains the first cluster of the file. That cluster number is used to locate the next cluster number in
the FAT and so on until the last one is found and loaded.
https://en.wikipedia.org/wiki/Design_of_the_FAT_file_system

Thank you very much

I have another question. I could not find in the comments why it starts in 32-bit mode. Could you explain this to me? I thought bootloaders always start in real mode.