![]() Other indicators (sound, keyboard LEDs) work fine in SVGA. Besides, if you can run those modes, you have a fast system, and would likely never see the "LED" in practice anyway. Supporting those would take up too much resident RAM and CPU time. SOFTHDDI supports dual-monitor DOS systems, and will display the virtual "LED" on the current active monitor. To prevent unnecessary slowdown on non-CGA video cards, the video hardware is detected on startup so that snow avoidance is only performed on true CGA hardware. ![]() To prevent locking up an XT-class system, SOFTHDDI will not allow enabling keyboard LEDs unless the PC is an AT (80286) or higher system.ĬGA "snow" avoidance is fully handled. This method was chosen to have the least impact to the system while still having a high likelyhood of visibility no matter what the color palette is set to. Graphics modes (redefinable palettes): An 8x8 square area is created by flipping all bits in that area.Graphics modes (fixed palettes): An 8x8-pixel "LED" graphic is painted.(On some monitors this attribute can result in a "halo", enhancing the effect.) Mono text mode: Colors are changed to become darkgreen-on-green.Color and B&W text modes: Colors are changed to become lightred-on-red.The goal is to display a flashing square in the upper left corner whenever there is disk activity. Painting the "virtual LED" on-screen is handled differently based on what video mode the system is currently in. The on-screen "LED" and speaker click indicators are effectively free (they don't slow down the system or I/O, even on a 4.77 MHz system), but the keyboard LEDs indicator can result in a slowdown (see Limitations below). The TSR uses roughly 1KB of RAM when resident, and automatically loads itself into upper memory blocks if present. Run "SOFTHDDI" with no arguments to see command-line usage. Keyboard CAPSLOCK/NUMLOCK/SCROLLLOCK indicator LEDs.An audible "click" that simulates HDD head seek noise.An on-screen "LED" that appears in the upper left corner.Three hard disk "indicators" are available, and can be enabled in any combination: Intended for MS-DOS systems with solid-state hard drives that lack both, so that disk activity can again be seen/heard. Provides simulated hard disk activity "LED"s and seeking sounds. SOFTHDDI Software Hard Disk Drive Indicators for DOS
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