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.
Quote from: arnoldemu on 21:30, 09 January 16
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 (http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/cpc-plus-cartridge-replacement-one-more/msg96357/#msg96357)
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.