Bernd Böckmann
Bernd Böckmann
> I'm off to write some tests now to see what MS-DOS 6.22 does. How do you write these tests and what is needed to run them? Would it be...
Thanks for the detailed explanation! > Got to break off now, going to watch the SpaceX IFT5 launch and 'catch'! Seems it was catched quite well :) Lets see how...
Confirmed. Though it does work with EDR COMMAND.COM.
But perhaps EDR COMMAND.COM only masks a kernel problem. We should not deal that much with it, but instead try to find out why the SvarCOM / EDR combination does...
Quickly created a copy test for checking this. Was not yet able to re-produce the error with it. BUT I noticed that the number the floppy has to be swapped...
Technically I see no good reason why reading not a multiple of 512 bytes would make more disk swaps neccessary. Even if the deblocking buffer is involved, that should not...
> With this new buffer size the int24h bug is no longer triggered. Maybe that's why EDR's COMMAND.COM works fine. And maybe it's a hint that the issue is somewhere...
Call stack of the disk flush routine: ``` flush_buffer (buffers.asm) select_adrive (bdevio.asm) check_media (bdevio.asm) dd_medchk (disk.asm) ask_for_disk (disk.asm) ```
In the below screenshot there is some diagnostic info shown which is output in the routine `blockif` (bdevio.asm). This routine is responsible for calling the actual read / write routine...