CSpect:known bugs

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Revision as of 21:31, 10 April 2022 by Ped7g (talk | contribs) ("not a bug" troubleshooting added)
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CSpect V2.15.02

  • sprites: the collision bit is not implemented (intentional for performance reasons)
  • sprites rendering is not one-scanline-buffer delayed and all changes in sprites affect current scanline (intentional for performance reasons)
  • (changed a bit in 2.15.02) modifications to NextRegs done in copper propagate to rendering usually only once per scanline, the state for rendering is sampled around end of right border area before h-blank area after h-blank area or in left-border, affecting previous line instead of next (palette changes, X/Y offsets, etc) (intentional for performance reasons)
  • modifications to NextRegs done by CPU propagate to rendering usually only once per scanline, usually retroactively for whole current scanline (mostly intentional for performance reasons)
  • blending modes: quite wrong (worse than 2.14.08), but the test is not comprehensive (HW core 3.1.5 now blends Layer2+ULA in different way (details))
  • sprites: 4bit relative patterns are incorrect in complex cases
  • DMA: reading-registers are a bit off (for example status bit5+0 not reset correctly after LOAD, probably few more (but core 3.1.5 also reads bit0 wrongly, so always test own code with all target platforms))
  • DMA: Zilog mode is not implemented (port 0x0B)
  • NextZXOS streaming API doesn't work (the initialization of stream fails - rst 8 service 0x86 ; DISK_STRMSTART)
  • there's still something not completely right about Enhanced ULA colours, maybe just default values are wrong, or even something is emulated wrongly? (test TFalBUla.sna)
  • di : halt doesn't put CPU in infinite loop waiting for NMI, but proceeds further
  • NextReg $02 implementation of soft/hard-reset does something, but not the same thing like HW yet (stuck in ROM03 infinite loop)
  • sprites: the wrap-around the 512x512 coordinate space is only partially implemented in extreme cases (relative sprite so far from anchor that x8 scale wraps it back onto screen)
  • default value: $6E and $6F are supposed to be fixed since V2.12.30, but the SNA test still reads zeroes
  • some NextRegs read as zero until they are written into first (quick-boot mode with SNA file without full NextZXOS image) (for example regs $03, $12, $13, $14, $42, $4A, $4B, $4C)
  • NextRegs $09, $34, $41, $8E read incorrectly (reads after certain writes produce wrong value) (but also the test is checking 3.1.5 behaviour, needs update to 3.1.10)
  • Copper disassembler plugin does not open under ctrl+alt+c
  • the initial file-import sequence of CP/M BIOS fails. (get cpm-a.p3d file from somebody with a working clean CP/M installation and copy that into c:/NextZXOS, or use other emulator to create the file)
  • Z80: block of prefixes/instructions 0xDD/0xFD/EI does not inhibit masked interrupts

not verified in V2.15.02 (but known bugs of older versions, may be still present):

  • default ULA palette after power on (quick boot without NextZXOS) is slightly different
  • (should be improved now, to be tested) without the full NextZXOS card image the esxdos services are provided by open source CSpect plugin, the implementation is limited and crude - some of the returned values are incorrect/etc, but loading files works.
  • direct loading of NEX files does not support all combinations of loading-screen type and palette on/off (but V2.12.9 does load more files than V2.12.5, all common ones should work)
  • sprites: something something about default clipping... just set clip windows explicitly in your SW.

Platform Specific:

  • Mac: Mouse does not work / behaves erratically
  • Mac: after launch keyboard being irresponsive - try "alt+tab" to other app and back
  • Linux: the copper disassembly window added in 2.15.01 (ctrl+alt+c) does not draw its content and remains as empty frame (after debugging the plugin: the winform doesn't receive paint messages from the emulator, same winform code running as stand-alone app without emulator does draw in linux)

Not a bug:

  • CSpect works with "-sound" (does switch sounds OFF), but shows only black screen without it:
    • you forgot to install OpenAL, check the ReadMe.txt of the emulator.