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Proper VDP Vblank interrupt handling when there are others source of interrupt active

by PingPong on 11-06-2019, 01:20
Score: 145.75 %, Type: Forum topic , Comments: 20 comments
check if int is coming by VDP by reading S#0 the VDP request an interrupt. 3) because reading S#0 ... when the z80 does in a,(99h) the VDP issue its own request. But Because we are reading the register S#0 ... the CPU can read S#0 and be able to detect VDP int. is there any other way? I don't see any ...

VDP Sprite overflow bit and polling

by PingPong on 04-06-2019, 12:23
Score: 145.58 %, Type: Forum topic , Comments: 1 comment
Hi, it is known that when one read the VDP status reg 0 the v. interrupt bit is cleared. ... another sprite overflow situation, reading the S#0 on line 151 do i report the first overflow at line 50, or the second occouring at line 150 ? In others words do the s#0 read reset the sprite overflow bit and make ...
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