Apple ][ out of memory

Apple II Plus system board without 16K Language card boots correctly.
Ctrl-Reset give the flashing prompt.
Even typing HOME returns an out of memory error.
Installing known good 16K Language card computer boot normally
but when typing HOME the screen goes to gibberish.

I know memory issues with these old critters can drive you into the nut house.
Any idea on where to start?

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Apple IIc questions...

I just picked up an Apple IIc and I have a couple of questions. It came with an external 5.25" drive, a couple of joysticks and a mono monitor. I have no disks to test. Without a physical floppy disk or the ability to make one, is there anything that I can do to test this computer? It powers on just fine and I get the Apple IIc line at the top of the screen and Check Disk Drive at the bottom... I plugged in the external drive and it doesn't do much of anything (I see the red power light flash briefly when I turn on the computer).

Thank you,
Roger

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