Altirra 3.90 Test 21

Description

Features

Emulates the Atari 400/800, 1200XL, 600/800XL, 130XE, XEGS, and 5200 systems.
Full, cycle-exact emulation of all documented hardware features.
Best-in-class emulation accuracy of undocumented hardware behavior, including undocumented 6502 instructions, precise DMA timing, mid-screen register changes, hardware bugs, and cycle-precise timer IRQs.
Support for most popular 8-bit image file formats: ATR, ATX, ATZ, DCM, XFD, PRO, ARC, BAS, ROM, BIN, A52, CAS, SAP.
Contains reimplemented versions of OS, BASIC, and handler ROMs to run 8-bit software with high compatibility without needing Atari ROMs.
Emulation of over three decades of hardware expansions, including memory expansions, cartridge expansions, Parallel Bus Interface (PBI) devices, modems, and 65C02/65C816 accelerators.
Accurate emulation of multiple disk drive types with options for accelerated disk loads, realistic disk timing, and drive sounds.
Flexible display with Direct3D/OpenGL acceleration, aspect ratio options, easy resizing, and artifacting support.
Audio and video recording, cheat trainer, DOS disk explorer with drag-and-drop, and text mode copy/paste.
Powerful debugger with label decoding, source-level stepping, conditional breakpoints/tracepoints, watchpoints, execution history with loop/call/interrupt folding, and profiling.
Native Windows UI with theme support, per-monitor high DPI support, file associations, and DirectInput/XInput controllers.
Both 32-bit (x86) and 64-bit (x64) versions available.

Fixed a bug with high-pass optimization at volume level 0 that was causing some PDM glitches.
Fixed an issue with denormals since the split filter changes that was using a bit of CPU time when everything went quiet. This was previously handled, but the mitigation code was bypassed in the new code.
Fixed an issue where sometimes UI wouldn't display in full-screen mode in DirectX 11 mode while the emulator was paused. (This doesn't apply to modal UI that forced an exit from full-screen mode.)
Fixed enhanced text mode sometimes not drawing its first frame properly.
Started on HUD customization, available from View menu -- you can now move and resize HUD elements. Currently this is only supported for a few of the audio graphs. Note that there was some major UI system rework under the hood, so there may be some bugs with indicators.
Added audio scope that shows the waveform coming out of POKEY, with all four channels. This is tapped between the two amplifier stages, so it uses a 64KHz source and shows the short time constant high-pass effect.
Fixed a bug in the CPU emulation where an NMI was being improperly held off for one instruction if it had been delayed due to RDY cycles from WSYNC. Those RDY cycles now count against the timing check.