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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, 21:41

> >
> > I can prepare a patch later.
> >
>
> Thanks for your commitment and help.
I took the opportunity to create an EDR-DOS repo on our server, at https://hg.pushbx.org/ecm/edrdos (I interpret the new CP/M and derivatives license agreement as of 2022-07-07 as including EDR-DOS, so it should be fine to host it. This license agreement is in the file license.htm in the repo's root directory.)

I added one patch to COMMAND that was needed to build with OpenWatcom 1.9 (from a DOS host system, running in dosemu2) fixing a bug.

I fixed the redirector support for functions 7142h and 71A6h, both to support the dosemu2 extensions and to never crash on a redirector handle. (If the extensions are not supported, 7142h returns an error code of CY, ax=0001h and 71A6h an error code of CY, ax=7100h (like MSWindows).)

Further, I modified both the old-style function 42h and 7142h to work on device handles in the same way as MSWindows, allowing to seek as if the device was an empty file. I also changed it so function 71A6h returns CY, ax=7100h on a device handle.

> PS: I noticed that you are also working on the RxDOS kernel. Is it stable?
No, far from it. And I'm not technically working on it currently. Haven't in a long time. You can view the current state in the repo: https://hg.pushbx.org/ecm/rxdos-7.2x/

I prefer contributing to the FreeDOS kernel now. I also use it for most of my developments (primarily the lDebug debugger).

---
l

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