joncampbell123/dosbox-x
1
0
Fork 0
mirror of https://github.com/joncampbell123/dosbox-x.git synced 2025-10-14 02:17:36 +08:00
Code Issues Packages Projects Releases Wiki Activity

INT 21h AH=4Bh (EXEC) on return, put a nonzero value in AX (and AL) for a buggy version of Magic Pockets so the INTRO proceeds to the GAME properly

Browse Source
This commit is contained in:
Jonathan Campbell
2025-10-09 17:48:41 -07:00
parent 3d2f54dfb3
commit 8f15d4da77
2 changed files with 12 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
CHANGELOG
View File

@@ -1,4 +1,9 @@
NEXT VERSION
- INT 21h AH=4Bh EXEC: Real MS-DOS returns a nonzero value like 0x3E01.
A buggy version of Magic Pockets fails to call INT 21 AH=4Dh to read
the INTRO.EXE exit code and expects AL to just be nonzero to continue
to the game. So to make it work properly (kind of), return a nonzero
value. (joncampbell123).
- Tandy machine type: Many registers are WRITE ONLY according to SX
documentation, yet "Troubadours" likes to read/modify/write those
registers in what appears to be hand-rolled manual modesetting code