VRetrace Mgr Data
VBLTask queue element used in Vertical Retrace queue typedef pascal void (*VBLProcPtr)(void);
inVBL 0x40 when bit 6 of global VBLQueue QHdr.qFlags is set, a VBL task is being executed
Do not use low memory global variables that are not documented.
No undocumented location below the system heap is guaranteed to be available
for use in future systems.
Name Address Size Description
VBLQueue 0x0160 10 QHdr of Vertical Retrace tasks Ticks 0x016A 4 as this changes, vertical blanking is happening
JVBLTask 0x0D28 4 Jump vector for DoVBLTask routine