Hi Thorsten,
Thanks for explaining this to me - to be honest I've never cared too
much about ISA and friends.
No problem. (I practically grew up with them, so while the knowledge
isn’t fresh, some is there.)
I grew up without computers - the first I used was a TR440 mainframe :-)
I'll check the layout - my guess would be that there's no memory
read/write selects wired up on the adapter. The RTL8019 doesn't need
them, the ISP1160 on the NetUSBee doesn't need them either.
I’d guess the same. You’d need them for things like an ISA graphics
card, but not (most) I/O devices.
Only /IOW and /IOR are wired up. Only A0 through A4 are wired up (from
A9-A13).
If someone ever comes up with a way to hook up a fully featured ISA
slot to the ROM port (mapping ports 0x00 to 0x7f to IO and above to
mem access should be possible) we might revisit the code. For now,
anything except for 8 bit IO can be turned into dummy functions or
compile warnings.
Might be nice, if possible. But for now, that would indeed be
the way to go (and clean up code).
I've had a look at the NetUSBee docs and see that the USB part of it
does require 8 bit writes but little endian 16 bit reads. So we will
need to retain the 16 bit reads for potential USB support there.
Cheers,
Michael
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