Yes, despite what others have posted about using the pause key, I found that one must jumper the pins. I now have a permanent jumber installed. I can switch between booting Zip or Sandisk by leaving the zip disk in/out.
I have Zipslack installed on the zip. I'm having troubles getting it to go past the kernal panic. The booting howto says to use right-shift page-up to find out what device the zip shows up at, but I can't scroll. Under dos, the zip appears as A: and the sandisk as C:. So I tried the fd0 as the root device and the booting process stops right after the zip is recognized because it is looking for an non-exisitant floppy. It is reported to be emulating a scsi device (sda) so I tried every variation of 1 to 4 for x in "loadlin vmlinuz root=/dev/sdax rw" but none works.
So, now I've used dolly to write the 1A-1 midori_3 image onto the sandisk. It boots and after about ten dots the screen goes blank. Oh well, I'm getting closer at least. Anybody knows what sandisk image might work?