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Minor fixes

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This commit is contained in:
transistor 2021-12-21 21:02:55 -08:00
parent ed030082cd
commit 5c415da3c3
2 changed files with 3 additions and 10 deletions
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4
src/peripherals/genesis/ym7101.rs
View File

@ -470,7 +470,7 @@ impl Ym7101State {
let mut i = 0;
loop {
let link = self.vram[sprite_table + (links[i] * 8) + 3];
if link == 0 || link > 80 {
if link == 0 || link >= 80 {
break;
}
i += 1;
@ -776,7 +776,7 @@ impl Addressable for Ym7101 {
if data.len() == 4 {
let value = read_beu16(&data[2..]);
if (value & 0xC000) != 0x8000 {
panic!("Unexpected");
Err(Error:new(&format!("{}: unexpected second byte {:x}", DEV_NAME, value)));
}
self.state.set_register(value);
}

9
todo.txt
View File

@ -1,12 +1,4 @@
* there is possibly a cpu bug in causing the acceleration in sonic 2 to be very slow. Speeding up the CPU makes it playably fast, but I think it's still
incorrect, in that the top speed is faster than it should be, but the acceleration is correct...
* for the speed problem, I've actually noticed the level vint is only called every ~33_200_000 ns which is twice as long as it should be, so maybe there's
a vint problem, maybe even a toggle trigger that should be a one-shot
* there is definitely something related to interrupts; 2 interrupts occur in between each call to Vint_Level (ie. Vint_Level only runs every 2 frames (33.2ms) instead
of every frame (16.6 ms), which perfectly explains the slowdown without it being related to an instruction implementation error... but why is this happening?
Maybe it's because the clock advances too much and first interrupt doesn't complete, or maybe there's a problem with interrupts and masking...
It does appear to do I/O with the VDP between te interrupts so it doesn't seem to be just waiting around
* for the line based hscroll, you need to add that extra cell cycle...
* there is still some kind of hscroll glitch, and it seems to entirely be caused by the horizontal scroll offset value. I could be calculating or adding/moding
@ -53,6 +45,7 @@ Audio:
Debugger:
* i need a way to debug only the cpu and not the coprocessor, but that's tricky without a way to id or compare Transmutables
* you also need a way to specify the device in a breakpoint, perhaps "break cpu:4a", or "break -cpu 4a"
* how can you improve the debugger?
* the command line definitely needs to be fixed so it prints the prompt correctly
* debugger could maybe even allows arrows left/right for editing, and up/down for history