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EDR-DOS bugs on int 21h functions 7142h and 71A6h (Announce)

posted by ecm Homepage E-mail, Düsseldorf, Germany, 13.08.2023, 23:18

> Thanks for making these changes. My most important fix is the one below
> (last two lines posted - in "disk.asm"). Without it, the system freezes on
> my computer with grub4dos.
If you allow it, I want to add your changes to my repo. I already downloaded the source archive you uploaded earlier:

> Here is the source code:
 >
> https://megawrzuta.pl/download/cbef417c0f85eeaed244828d5915c6e5.html
Other than what you quoted here I am also interested in the other changes you mentioned:

> Files with the "org" extension are uncompressed, while the others are.
 >
> Here are some changes:
 >
> Does not scan LBA drives when dx<80h,
> For unsupported functions, 71xx returns ax=7100h again,
> Handling interrupts 0x00 and 0x06 (division by zero and invalid opcode) as in FreeDos.
and

> Not exactly, but I used the aPACK and UPX programs for the BIOS and DOS parts respectively and some tricks.
and

> Here is another improved version of EDR-DOS. Now the interrupt vectors saved at startup are again at the fixed address 0070h:0100h.
and

> Today I added the INT21.AX33FF.DX0000 function as in RxDOS and FreeeDOS.
 >
> I also removed exception handling 0x6 due to some BIOSes using invalid CPU instructions prefixed with 0xF0 (LOCK) generating this exception.
Did you actually not use the EDR-DOS packer to compress your kernel files? https://pushbx.org/ecm/download/edrdos/pack100.zip and https://pushbx.org/ecm/download/edrdos/pack101.zip

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l

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