Closed MackW closed 10 months ago
I don't have access to a real Aquarius and as such I've not been able to measure the exact frame timing. Also the emulator is only emulating line by line.
at a guess, - you are taking the border colour at frame start, and then not updating it through the frame (as virt aquarius does).
Aqualite does a cycle count, so that it knows where it is on the border.
It's the same stuff as what was done on the speccy, changing border colour mid frame gave a split.
is how it should look
I can do the frame timings for you if it helps ?
The border color/character is read every line rendered in the emulator. On the actual hardware it is read at the start of each border character.
Sean's just posted a vid that the border is behaving the same for both the emu and HW versions.
https://github.com/fvdhoef/aquarius-plus/assets/6732183/f77dcb90-d627-462d-af32-df730b0bb55c
Border should be Black until the top row, then red and red until 1px of the border at the bottom
It probably then has more to do with the behaviour of port $FD. The value in there currently is: 1 for lines < 242, otherwise 0. There are 262 video lines in total. The first 240 are visible.
Ahh, the value on the real hardware is actually 1 between lines 0->25 char lines .. need to check the values, but $FD is still 0 until the first Char display line starts So the VBL on $FD doesn't change until it starts displaying the new Char screen, - So it's not a true VBL as such, just a "I'm doing the top/bottom border' flag
If you can describe me the correct behaviour that would be great! Then I can fix it.
Let me find the stuff I gave Richard for when he did Aqualite.
Lol... possibly a little simplistic, but corrrect (RHS lines should match LHS lol)
So the value is already low in the border? Top/bottom border that is. So then it isn't really a vblank, but more of an 'active area' indicator.
Yes, it goes low at the first line of the border at the bottom of the screen, and stays low until first line of the top drawn screen 100% - active area - you got it
Can you give me the RFDV7.rom so I can test with that?
Fixed in emulator commit ee99189d5e8cc2a49688887c626fd5c486a40fcb and FPGA commit 36576eb7472c257a5f3b22f93ffcab3909fb0dee
Thanks Mack to help with this!
RFDV7.rom does some border effects based off the VBL on port $FD The emu doesn't seem to handle these - Aqualite does (Virt Aquarius doesnt)