RoboCop versus The Terminator screen flickers strobes during game play

[ghost]

RoboCop versus The Terminator screen flickers strobes during game play

[ghost]

on older versions this game is fine. i have a feeling its irq timing

[lordpeluca]

In the official version 1.56.2 that is in releases there are no blinking problems ...

Maybe fixing the blink problem of daffy duck has caused the same in the robocop vs terminator?

[ghost]

broke here
e3216ec

[ghost]

Here's what I see:

--- IRQ Timer HC:36 VC:31 set 357378 cycles HTimer:0 Pos:0000->0010  VTimer:1 Pos:031->031
*** IRQ


$80:9683 A9 20       LDA #$20                A:C242 X:0000 Y:00FF D:0000 DB:80 S:01F0 P:eNvMXdIzc HC:0486 VC:031 FC:37   V .n.    HT:10 VT:31 C:357378
$80:9685 8D 09 42    STA $4209  [$80:4209]   A:C220 X:0000 Y:00FF D:0000 DB:80 S:01F0 P:envMXdIzc HC:0498 VC:031 FC:37   V .n.    HT:10 VT:31 C:357378
--- IRQ Timer HC:516 VC:31 set 1374 cycles HTimer:0 Pos:0000->0010  VTimer:1 Pos:032->032


$80:974A A9 81 00    LDA #$0081              A:96B5 X:0000 Y:0000 D:0000 DB:80 S:01F0 P:eNVmxdIzc HC:0040 VC:032 FC:37   V .n.  L HT:10 VT:32 C:357378
$80:974D 8D 00 42    STA $4200  [$80:4200]   A:0081 X:0000 Y:0000 D:0000 DB:80 S:01F0 P:enVmxdIzc HC:0058 VC:032 FC:37   V .n.  L HT:10 VT:32 C:357378
--- IRQ Timer HC:76 VC:32 set 268435455 cycles HTimer:0 Pos:0000->0010  VTimer:0 Pos:032->032
--- IRQ Timer Enable HTimer:0 Pos:0010  VTimer:0 Pos:032


$80:9750 A9 A1 00    LDA #$00A1              A:0081 X:0000 Y:0000 D:0000 DB:80 S:01F0 P:enVmxdIzc HC:0088 VC:032 FC:37     .n.    HT:10 VT:32 C:268435455
$80:9753 8D 00 42    STA $4200  [$80:4200]   A:00A1 X:0000 Y:0000 D:0000 DB:80 S:01F0 P:enVmxdIzc HC:0106 VC:032 FC:37     .n.    HT:10 VT:32 C:268435455
--- IRQ Timer HC:124 VC:32 set 357378 cycles HTimer:0 Pos:0000->0010  VTimer:1 Pos:032->032
--- IRQ Timer Enable HTimer:0 Pos:0010  VTimer:1 Pos:032
$80:9756 80 11       BRA $11    [$9769]      A:00A1 X:0000 Y:0000 D:0000 DB:80 S:01F0 P:enVmxdIzc HC:0136 VC:032 FC:37   V .n.    HT:10 VT:32 C:357378


========  missed irq @ VC:032 FC:37 ===============


--- IRQ Timer HC:24 VC:32 set 357374 cycles HTimer:0 Pos:0000->0010  VTimer:1 Pos:032->032
*** IRQ
$00:964B 5C 4F 96 80 JMP $80964F[$80:964F]   A:0004 X:FFFE Y:0002 D:0000 DB:80 S:01FB P:envmxdIzC HC:0084 VC:032 FC:38   V .n.  L HT:10 VT:32 C:357374

Haven't compared against bsnes.

[bearoso]

We need to allow enabling IRQ to trigger the IRQ instantly as long as VTIMER was rewritten.

I'll have to see if OV2's alternate fix for this issue doesn't have the same problem.

[OV2]

For RoboCop it seems to be enought to change it back to S9xUpdateIRQPositions(true); in 4200. Psycho Dream still works because of the check for a change in the byte value.

[bearoso]

That's simple enough. Fixed in e543702.

[ghost]

Thanks again guys!!

[niuus]

Hey guys!. How would i go implementing this fix to a 1.52 codebase? Is it possible?
https://github.com/niuus/Snes9xRX

[bearoso]

That could be difficult because it would probably break other games. You'd end up having to supplant the entire IRQ code.

[niuus]

Oh, that's a shame. Thanks for the answer, bearoso.