138 lines
7.1 KiB
Plaintext
138 lines
7.1 KiB
Plaintext
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* what if, to allow a device to have multiple steppable functions, you pass the system in, or otherwise provide some mechanism for
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each device to create sub devices which are scheduled independently
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* should it be possible to reschedule multiple events at different intervals to reduce the times a given step function is called? Some have
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multiple clocks, or multiple things at different clocks, and making them each an event would mean they could be smaller and faster, but at
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the cost of having more events on the queue when re-scheduling. There needs to be a mechanism to avoid the event queue ballooning due to
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an error
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* can you somehow make devices have two step functions for running things at different times? (I'm thinking ym2612 audio gen vs timers)
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* the genesis coprocessor stuff will be a good reference point for things that make multiple devices, and how to add them correctly to the system
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* address repeater on ym2612 doesn't seem to work the same, when it's on the 68000 device. The Z80 device doesn't have an affect, but maybe it's not being used
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* I like making address adapters like this (below)
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* you could have busport take a closure or something which translates the address, and returns an error that will be passed up if it occurs
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in order to implement the correct behaviour for address exceptions in 68k, transparently
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* make Signal directional, by making SignalDriver and SignalInput or SignalReceiver
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* fix the m68k timings
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* add rust runtime checks for math to look for overflow errors
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* fix the watchers in the Bus, maybe make them manual
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* make it possible to compile without audio support (minifb frontend requires it atm)
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* does Z80 need a customized Z80BusPort like the 68k?
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* can you make it so you don't need borrow_mut() so much?
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* make the keys easier to config...
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* modify cpal code to skip audio until caught up
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* AudioFrame (and possibly the mixer and source) should be moved to the core, it should probably have the sample rate
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* split AudioOutput into a sender and receiver
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* can you eliminate the source-to-mixer queues?
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* add audio support to the console, but it needs to be conditionally compilable so that audio can be disabled (computie doesn't need it, only genesis)
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* sound doesn't work on a lot of games... is it a problem with the Z80 accessing the YM2612, or the lack of YM timers? or something else?
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* make the ym generate audio in sync so the DAC timings can be more accurate
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* add stereo output to ym2612
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* you need to scale the output sample to be +/- 1.0 instead of 0-1.0
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* fix ym2612 sound generation (no bass, no LFO, etc)
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* the interrupt controller stuff is really not good. It should be more like busport, and connected to a device at startup (eg. create
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interrupt controller, then create objects that use that controller and pass in values, maybe an option so that the controller doesn't
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have to be hooked up, meaning hardware interrupts would not be used.
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* should you make Address a newtype and add From impls for each type of numeric, and add utils to wrap address at certain boundaries and such
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* should you make a means of storing different kinds of buses?
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* should you make buses hide their RcRefCell?
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* add doc strings everywhere
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* get rustfmt, rustdoc, and clippy working in some kind of semi-automatic fashion
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* you really need a full web-based debugger
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Web Assembly:
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* can you make the web interface nicer with like... a picture of a genesis or something
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* for some unknown reason, the js-based updater works much better than the rust based one, but the rust based one just goes back to
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a fixed time per loop instead of trying to speed up
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* clean up pixels frontend
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System/Traits:
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* maybe I should make ClockDuration use picos as the base instead, and use u64 since that gives like 212 days or something instead of 5h
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and should prevent split nanoseconds which is the main concern
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* add opentelemetry if it can be wasm compatible, or some kind of timing for giving an average framerate
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* can you make the connections between things (like memory adapters), be expressed in a way that's more similar to the electrical design?
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like specifying that address pins 10-7 should be ignored/unconnected, pin 11 will connect to "chip select", etc
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* should you simulate bus arbitration?
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* interrupts could be done in a better way
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* need a better way of handling disparate reads/writes to I/O spaces, rather than having multiple devices or having a massive chunk of address space allocated, continuously
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* should you modify Addressable to also take the absolute address as input? I'm thinking of how the same device could be mapped to multiple addresses in memory instead
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of taking up a whole range of addresses
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* you could modify read()/write() in Addressable to return the number of bytes read or written for dynamic bus sizing used by the MC68020+
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* add ability to serialize/deserialize state into something, so it can be restored... (maybe not worth it though)
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Debugger:
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* the debug dump things should not used the clocked addressing, but use a debugging mode thing of some kind so as not to influence the sim state
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* 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
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* add a way to delete a watcher
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* get stack tracing working again, but can you do it with just data?
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* how can you improve the debugger?
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* debugger could maybe even allows arrows left/right for editing, and up/down for history
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Genesis/Mega Drive:
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* the 68000/Z80 bank switching is probably buggy
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* the H/V counters are not accurate because it seems to count at different speeds in the blanking period (time vs return value numbers don't divide properly)
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* make the ym7101 set/reset the v_int occurred flag based on the interrupt controller
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* there is an issue with Mortal Kombat 2 where it will crash randomly at the start of a fight. The code is actually swapping
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stacks a bunch of times, and at some point, the stack is corrupted or something and it `rts`s to the wrong address...
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* add support for the sprite overflow flag (low priority)
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* still possibly a bug with the shadow/highlight colours
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Macintosh:
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* issues when booting the rom, attempt to write to rom during the driver init/open phase
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* for the address bus/repeating thing in the mac with the rom and ram, can you make it work for both the 128 and 512
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68000:
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* for 68k impl, I want to make some kind of memory transaction object that does everything in a contained but logical way, including handling exception
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information needed about the last access, and adjusting the pre/post inc/dec
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* unimplemented: BFFFO, BFINS, NBCD, RTD
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* >=MC68020 undecoded & unimplemented: BKPT, CALLM, CAS, CAS2, CHK2, CMP2, RTM, PACK, TRAPcc, UNPK
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* add support for MMU
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* add support for FPU
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* Coprocessor instructions: cpBcc, cpDBcc, cpGEN, cpScc, cpTRAPcc
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Z80:
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* unimplemented: CPD, CPDR, CPI, CPIR, DAA, IND, INDR, INI, INIR, INic, INx, OTDR, OTIR, OUTD, OUTI, OUTic, OUTx
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Synth:
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* add mouse support to synth app
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* can you eventually make the system connections all configurable via a config file?
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