One trick you may be able to employ is have one or more physical drives
connected to the Atari via SIO in various drive number settings and
have power shut off to those you don't want active as in the case
of an active SIO2PC emulated drive #1 on a PC. Copy files to your ramdisk,
disable PC program, turn on physical drive, press RESET on Atari and
have the physical #1 drive working. I have a four drive stack, two #1
and two #2, sometimes only one is powered up, only two can be powered
else there are issues with too many devices operating under the same
1050 drive has two SIO ports, one goes to computer and the other goes
to SIO2PC if you are not fluent in the way the SIO daisy chain works.
If you need more SIO connections you can have that with two SIO cables
wired and soldered together, but it's a grand project all it's own. You
also need more (up to 3 in total) double SIO socket drives/devices to
gain empty and useful SIO sockets with.
Other methods exist but are getting very rare to obtain such as
I don't recall any other alternatives since I built my own 'quad' SIO
cable (the above grand project) when I was first starting out and was
suffering the SIO jack pinch where you just don't have enough of them.
It's important you hear this at least once. NEVER hot plug any SIO
device EVER, powered down or up is not the issue -- DON'T is the
issue. You can get away with it 100 times and then you'll have a
defective drive/device to try and find a replacement for. Thems the
breaks, take that road and suffer. Only system wide power down entirely can
changes be done safely in the SIO daisy chain.
Not sure if very much of this applies to your Altirra mode set up
anyway but there it is for what's it's worth.