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FreeDOS on SBC188 (Announce)

posted by ecm Homepage E-mail, Düsseldorf, Germany, 14.09.2020, 13:22

> I redid also posting ldebug.com, a message appears "[more]" if I try to
> write something it doesn't make me write, any key I try to press messes
> with the writing [more] but I don't seem to be able to do anything ... I
> don't know if it's important but SBC188 has no keyboard and real monitor, I
> am connected in terminal via putty.
Hmm I have an idea what might cause this. The problem likely is not with the keyboard input and screen output; the debugger uses the ROM-BIOS interfaces for those (int 16h and int 10h). These seem to be supported by the SBC188.

I will provide you with an adjusted binary later today. For now, you can run the following command from DOS to help me determine whether I am right: ldebug.com /C="h byte [40:84];q" (This byte is used by the debugger's pagination mechanism to determine how many rows to display before paging. I expect it might be initialised to zero or not initialised at all by the SBC188 ROM-BIOS.)

And by the way, to make the debugger usable as a DOS application right now you can start it like ldebug.com /C="r dco |= 10" (which sets the "disallow paged output to StdOut" option flag). Unfortunately this does not directly translate to the bootable mode of the debugger because it would require passing a kernel command line according to the lDOS / RxDOS.3 load protocol. It happens to be the case that the debugger itself is currently the only way to pass such a command line. That's why I'll have to fix the debugger's paging handling or disable it by default to help you use it on the SBC188.

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l

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