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5.0.2 vs 5.1_a2


rbairos
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I have a very simple example that places the player sprite positions.
Unfortunately, it results in slightly different positions between stable (5.0.2), and latest github compilations of stella (5.1__a2)

Positions are 2,2 in 5.02 but delayed one: 3,3 in 5.1_a2
Which one is correct?

Secondly, when in the stella debugger, and pressing [scan + 1], those values remain constant,
but pressing [Frame + 1] causes random values for those positions, for each click??
It goes back to the original values when I press [scan + 1].

Is that normal? Very confused by that behaviour,
Thanks

Rob

processor 6502
include vcs.h


seg
org $F000


Start
sei 
cld   
ldx #$FF 
txs 


;zero memory
lda #0 
ClearMem 
sta 0,X 
dex 
bne ClearMem 


sta WSYNC 
nop
nop
nop
nop
sta RESP0
nop
sta RESP1




doFrame1
jmp doFrame1


org $FFFA
.word Start ;NMI
.word Start ;RESET
.word Start ;IRQ

 

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3 is correct; that was a bug I fixed august last year. However, this affects only the debugger; the actual image is identical and correct in 5.0.2 and current git. Not sure about the fluctuations on stepping frames; this looks like a bug to me. You are possible triggering it by not generating a valid frame at all :P I'll open a ticket tomorrow.

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