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add VBL task in replacement disk driver
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this fixes wintergames
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@zydeco
zydeco committed Sep 21, 2020
1 parent 098dd20 commit 53c291a
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Showing 2 changed files with 44 additions and 23 deletions.
17 changes: 17 additions & 0 deletions extras/mydriver/disk/mydriver.a
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Original file line number Diff line number Diff line change
Expand Up @@ -179,6 +179,11 @@ RomBase EQU $00400000
Lea.L (DrvQHdr),A1
Jmp (RomBase + 2848)

VBLTaskFreq EQU $7FFF

VBLTaskProc
MOVE.W VBLTaskFreq, $000A(A0)
; fallthrough to return

NullTaskProc
RTS
Expand Down Expand Up @@ -241,6 +246,18 @@ DOpen
MOVE.L A3,D0
BEQ.S @3

; Some games (Wintergames) manipulate the VBL
; queue directly, and will break if the queue
; was empty. Add a VBL task to prevent this.

MOVE.L #14, D0
DC.W $A71E ; _NewPtr ,Sys,Clear
LEA VBLTaskProc,A1
MOVE.W #1,$0004(A0) ; task type
MOVE.L A1,$0006(A0) ; task procedure
MOVE.W VBLTaskFreq,$000A(A0)
DC.W $A033 ; _VInstall

; There is apparently a bug in the time manager
; in System 6.0.8, which will cause a crash
; if there are no installed time
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50 changes: 27 additions & 23 deletions src/ROMEMDEV.c
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Original file line number Diff line number Diff line change
Expand Up @@ -44,55 +44,59 @@ LOCALVAR const ui3b sony_driver[] = {
68k machine code, compiled from mydriver.a
*/
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