UniPCemu build 2018/11/16 09:35 is now live!

The latest updates for UniPCemu are now available on itch.io! These include CPU improvements, various hardware improvements and emulator speed optimizations. Also 16-bit protected mode has been improved to be way more accurate! The 8086/8088 has also been improved with more cycle-accurate timings.

Common emulator framework updates:

• Improved CPU speed display to no longer display 1% when running between 0-1%.
• Improved GPU speed display to become red when truly 0%.
• Fixed static framerate item duplicate.
• Fixed framerate module comment.
• Improved hanging CPU detection when reading the CPU speed.
• Improved active/inactive CPU speed to be darker colors. - Optimized sign conversions to process faster.

UniPCemu updates:

• Updated the common emulator framework to the latest commit.
• Optimized modrm REG reading to be precalculated for an opcode.
• Removed modrm EA calculation for the base EA address(already implemented within the modr/m handling).
• Made relative and absolute EIP loads proper 32-bit when required casting.
• Fixed settings menu CPU selection initial item detection.
• Added support for oddly sized floppy disks, generating some default geometry information to use for it.
• Improved floppy geometry detection.
• Fixed floppy invalid geometry crash and no floppy geometry being available.
• Fixed BT* timings to not double it's own EU cycles executed.
• Improved ARPL timings to be more accurate with writeback.
• Improved protection on JMP to gates to be properly check the privilege level.
• Implemented cycle-accurate MUL.
• Fixed x86 MUL to act as documented.
• Fixed signed multiplication.
• Applied cycle-accurate multiplication to all 808X multiplication instructions.
• Implemented a more cycle-accurate version of the 8086 DIV instruction(still has errors).
• Slightly improved IDIV.
• Divide starts out with carry.
• Fixed 808X header.
• Improved (I)DIV divisor wrapping.
• Fixed negative quotient detection.
• Fixed signed division overflow.
• Made the Android compiler happy.
• Implemented AAD cycle accurate timing using MUL.
• Disabled old (doubled) div/mul cycles calculations.
• Modified 808X generic support function EU timings based on Reenigne's findings.
• Modified most basic 808X instruction timings based on Reenigne's findings.
• Modified the remaining 808X opcode timings based on Reenigne's findings.
• Added missing cycle.
• Added missing REP cycles.
• Added remainder of REP timings.
• Adjusted CMP cycles to be according to Reenigne's findings.
• Fixed JMP gated access to be simplified.
• Improved privilege level checking for data/system and (non-)conforming code segment descriptors.
• Fixed typo causing compiler errors.
• Fixed protection code.
• Fixed privilege level conditions.
• Don't activate the BUS and tick the BIU when faulting on prefetch: nothing can be transferred in that case.
• Removed duplicate privilege level check.
• Lowering CPL on RETF is already done in the segmentWritten function.
• Cleaned up the protection segment loading code.
• Moved the present check up: all other bits are invalid when not present.
• Fixed invalid descriptor check to throw the right error code.
• Improved VERR and VERW descriptor checking behaviour.
• Improved and fixed VERR and VERW.
• Fixed breakpoint triggering on Protected-mode hardware interrupts.
• Improved breakpoints to work as earlier, but improved conditions.
• Added missing definition of getLoadedTYPE.
• Updated the Android Studio project to the latest version.
• Fixed roof segment descriptor precalcs.
• Implemented Task breakpoints and CR3 breakpoints.
• Fixed new code errors.
• Fixed new settings menu labels.
• Added missing settings menu debugger case statements.
• Fixed unassigned new debugger options in the settings menu.
• Improved zero-extending limit and base precalcs.
• Fixed CR3 breakpoints.
• Fixed the CR3 breakpoint to use it's own breakpoint correctly, instead of overwriting the task breakpoint.
• Fixed CR3 breakpoint address loading.
• Removed unused variables and labels.
• Task switches are non-reentrant. Improved clearing old TSS descriptor's busy bit.
• IRET task switches must allow returning to busy tasks(required).
• Improved IRET TSS faults.
• Fixed 16-bit TSS loading.
• Fixed BIOS settings menu screen clearing to clear the entire screen properly.
• Fixed advanced log setting loading from the correct section.
• Improved volume doubling on OPL2/adlib.
• Improved OPL2 percussion.
• Fixed OPL2 missing key on for percussion instrument pairs.
• Completed basic CMOS register map.
• Added missing interrupt privilege level change timings.
• Removed various todo comments, as they're resolved.
• Removed unused variable.
• Adjusted 10-bit phase to be corrected.
• Removed unused operator calculation during Hi-hat sample generating.
• Fixed OPL2 RNG.
• Added support for a direct value as the source of the phase of a OPL2 signal.
• Improved OPL2 percussion phase calculation.
• Improved OPL2 channel volume.
• Improved DR0 player time display.
• Fixed Task register loading faulting when using the LDT instead of using a requester privilege level of 2 or 3.
• Optimized paging ages to only update when writing new entries and when accessing memory using the entry.
• Optimized Paging aging.
• Optimized Paging TLB reads.
• Optimized ModR/M decoding when not requiring debugger information.
• Optimized paging tag generation.
• Unlocked the 8042 output buffer.
• Optimized segment descriptor rights precalcs to be precalculated during the emulator being initialized only.
• Fixed segment descriptor precalcs to run correctly.
• Optimized paging using inlining and algorithmic privilege level detection.
• Improved modem quick dial to properly execute a dial command.
• Protected against infinitely recursive dials.
• Improved PIC.
• Updated required SDK version.
• Improved PIC shared interrupt handling.
• PIC IRR now also pends shared raised and lowered interrupts correctly.
• Fixed PIC compiler issues.
• Fixed Sound Blaster IRQ being parallel correctly.
• Optimized debugging instruction disassembly to only be set once.
• Fixed missing debugger variable.
• Improved initialization of CR0 on all processors.
• Improved CR0 on 80486 to keep bits 30/29 as documented.
• Improved writing of CR0 to only keep and set documented bits of CR0 as documented on 80386 and 80486 processors.
• Improved differentiating between INIT and RESET signals(INIT only during emulator startup).
• Fixed compiler warnings.

Various MS-DOS extenders are now running correctly(like Dos/4G and related variants). That means that many 286/386+ games that use them can now run.