Reply 1580 of 1866, by TheGreatCodeholio
Could that option be removed from the configuration list? Also, is it ever necessary to set "allow dma address decrement" to false?
The floppy option, perhaps.
"allow dma address decrement" doesn't need to be changed, but it's there for retro-development as a "what if" for your code. As in, "what if the hardware omitted the rarely used backwards DMA (decrement) mode?"
Currently the only case I know of where backwards DMA is unsupported are PCI sound cards combined with a TSR that uses it to emulate Sound Blaster. Such as one test system I have set up with a Sound Blaster Live! card and the Creative TSR driver to test DOSLIB against SB16 emulation. I've found the TSR does an excellent job of SB16 emulation, a "meh" job at OPL3 emulation, but it doesn't support Direct DAC commands, nor does it support the decrement mode of DMA.