Comments on: MZ is back, baby! – Source to MS-DOS 4.0 / European DOS / Multi-tasking DOS drivers released!

By: neozeed

neozeed — Sat, 27 Apr 2024 20:37:24 +0000

In reply to usotsuki.

https://github.com/neozeed/dos400

now with hard disk booting action!

By: usotsuki

usotsuki — Fri, 26 Apr 2024 21:56:47 +0000

In reply to neozeed. Let's DO IT, MAGGOTS!

By: neozeed

neozeed — Fri, 26 Apr 2024 21:31:23 +0000

In reply to John Elliott. Well luckily the source is open I guess it's time for some netbsd like patch kits?!

By: John Elliott

John Elliott — Fri, 26 Apr 2024 21:27:49 +0000

I do hope that if people distribute their own builds of this, they’ll take out the code that requires hard drive partitions to have OEM IDs of “MSDOS”, “IBM” or “OS2” (see https://github.com/microsoft/MS-DOS/blob/main/v4.0/src/BIOS/MSINIT.ASM#L1661 ). The check on version numbers that follows is also terribly wrong (it does a word comparison against “3.”, which doesn’t do what it should if the last-but-one character of the OEM ID isn’t a dot).

There’s also an easy fix for the bug where DEBUG generates PSPs with the wrong CALL 5 address: add a couple of INC AX immediately before the MOV ES:WORD PTR [6], AX at line 463 of DEBUG.ASM.

By: Random

Random — Fri, 26 Apr 2024 16:34:12 +0000

This is just amazing. I thought the ms-os2 drop was awesome but this is just brilliant. I mean yes, it’s DOS 4.0 but for context FreeDOS aimed at DOS 3.3 compatibility for ages. I’m over the moon and excited to get to play with this.