openMSX vdpcmdtrace "on" and game silviana

Prophet (3898)

01-04-2018, 18:50

Hi, all, i noticed the game SILVIANA does some strange vdp commands, with NEGATIVE values in the nx,ny registers.
Is this a bug on openMSX or a particular way to show some parameter of the commands?

VDPCmd HMMM-IMP (15,95)-&gt47,95),0 [-16,-16]
VDPCmd HMMM-IMP (223,79)-&gt255,79),0 [-16,-16]
VDPCmd HMMM-IMP (127,79)-&gt159,79),0 [-48,-16]
VDPCmd HMMM-IMP (15,79)-&gt47,79),0 [-16,-16]
VDPCmd HMMM-IMP (79,63)-&gt111,63),0 [-48,-16]
VDPCmd HMMM-IMP (223,47)-&gt255,47),0 [-16,-16]

By wouter_

Champion (485)

01-04-2018, 21:12

The nx/ny registers are reported as negative when the dix/dix bits (bits 2 and 3 in register R#45) are set. Meaning the copy direction is from right to left (or bottom to top) instead of from left to right (or top to bottom).

By Grauw

Ascended (10604)

02-04-2018, 00:20

Neat debugging feature, I didn’t know about that!

VDPCmd  YMMM-IMP (0,782)->(0,1008),0 [256,2]   -- player sprite patterns copy
VDPCmd  HMMM-IMP (88,560)->(200,16),0 [4,16]   -- tile copies for diagonal scroll
VDPCmd  HMMM-IMP (8,512)->(200,32),0 [4,16]    -- ...
VDPCmd  HMMM-IMP (8,512)->(200,48),0 [4,16]
VDPCmd  HMMM-IMP (8,512)->(200,64),0 [4,16]
VDPCmd  HMMM-IMP (8,512)->(200,80),0 [4,16]
VDPCmd  HMMM-IMP (8,512)->(200,96),0 [4,16]
VDPCmd  HMMM-IMP (24,608)->(200,112),0 [4,16]
VDPCmd  HMMM-IMP (8,512)->(200,128),0 [4,16]
VDPCmd  HMMM-IMP (8,512)->(200,144),0 [4,16]
VDPCmd  HMMM-IMP (88,512)->(200,160),0 [4,16]
VDPCmd  HMMM-IMP (88,544)->(200,176),0 [4,16]
VDPCmd  HMMM-IMP (88,528)->(200,192),0 [4,16]
VDPCmd  HMMM-IMP (88,560)->(200,208),0 [4,16]
VDPCmd  HMMM-IMP (8,512)->(200,224),0 [4,16]
VDPCmd  HMMM-IMP (8,512)->(200,240),0 [4,16]
VDPCmd  HMMM-IMP (8,512)->(200,0),0 [4,16]
VDPCmd  HMMM-IMP (84,544)->(212,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(228,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(244,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(4,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(20,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(36,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(52,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(68,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(84,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(100,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(116,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(132,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(148,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(164,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(180,16),0 [4,16]
VDPCmd  HMMM-IMP (4,512)->(196,16),0 [4,16]
VDPCmd  YMMM-IMP (0,984)->(0,976),0 [256,4]    -- sprite colour table copy

By PingPong

Prophet (3898)

02-04-2018, 11:10

thanks wouter