Dick Tracy (GX4000)

[arnoldemu]

Just wondering if anyone has ever seen sprites missing on Dick Tracy on a real GX4000 or Plus machine?

The code only sets lower byte of Y coordinate and assumes upper byte is zero at power on/reset time.

ASIC documents say neither X or Y of sprite coordinate are reset at power on so sometimes it should be random and the sprite will not be displayed in the correct y position and will disappear.

[gerald]

Just wondering if anyone has ever seen sprites missing on Dick Tracy on a real GX4000 or Plus machine?

The code only sets lower byte of Y coordinate and assumes upper byte is zero at power on/reset time.

ASIC documents say neither X or Y of sprite coordinate are reset at power on so sometimes it should be random and the sprite will not be displayed in the correct y position and will disappear.

I've seen it 
I cannot find any reference in the forum, but I've found a mail I sent you about it last year.
Some other init weirdness : CPC Plus cartridge replacement : one more

[arnoldemu]

I have tested it and most of the time the x,y coordinates are zero after power up.

palette is random.
sprite data is random.