IIC Rom 4X booting on external drive

I get the same result with a SmartDiskII card or even a real LiRON.  I've never been able to get SmartPort to work.  I haven't tried it on my IIgs, but I should.  I should also try it with one of my Yellowstone cards.

What emulator are you trying to boot and how is it configured?

Have you invoked the ROM4X menu and tried booting from opyion 7 (external 5.25 disk)? You should not need Smartport unless you're trying to boot something other than a 5.25 disk image.

Are you seriously trying to boot an emulator on a //c or are you trying to boot a //c on an emulator?

VIBR wrote:

I am working on a floppy disc emulator and for some reason I can not boot a IIc on a Prodos Image using PR7 (Ext Drive)

 

That's an old problem, possibly not affected by your emulator.  The ability to use "PR#7" to boot external devices was a barely-functional hack that Apple attempted only in the initial ROM version of the //c, and the capability was abandoned in all subsequent ROM versions.

Here's Steve's summary about various ROM versions from the blogpost Apple IIc ROM Upgrade at BMOW:

BMOW blogpost ROM 255.png

Here's how each ROM version responds to the PR#7 command:

• ROM 255 activates external 5.25 diskette and loads its boot sector, which usually tries to continue loading from the internal 5.25 drive...and thus fails to boot from the external device.  No other external drives supported, no smartport devices.
• ROM 0 prints "APPLE TALK OFFLINE" and doesn't boot an external device.
• ROM 3 and ROM 4 just cause the computer to hang.