On 12/19/18 7:41 AM, Ethan via cctalk wrote:
me one that is 1) in current production, 2) offers the
full ISA bus (not just some decoded address lines and 8 data lines),
3) plugs into a PCI slot.
Surprised no one has used something like an ATMega or cheap USB
connected ARM to build a USB to ISA adapter with tie in to DOSBox or
some other emulator.
For what it's worth, I've never seen an ISA to USB or ISA to PCI
"bridge" implementation that was fully functional--and that includes P4
and later motherboards using a bridge chip. I've been round the block
with a couple of motherboard vendors.
Some leave out legacy DMA support; others are so incomplete that the
legacy drivers don't even see the ISA card in question or that the
memory space isn't accurately mapped.
Using an ATMega to access a 16-bit ISA board with full DMA, interrupt
and local ROM seems to be a bit beyond the MCU's capabilities.
I'll be happy to be proved wrong.